Magnetic structure and analysis of the exchange interactions in BiMO(PO4) (M = Co, Ni)
Identifieur interne : 000122 ( PascalFrancis/Corpus ); précédent : 000121; suivant : 000123Magnetic structure and analysis of the exchange interactions in BiMO(PO4) (M = Co, Ni)
Auteurs : O. Mentrel ; F. Bouree ; J. Rodriguez-Carvajal ; A. El Jazouli ; N. El Khayati ; El M. KetatniSource :
- Journal of physics. Condensed matter : (Print) [ 0953-8984 ] ; 2008.
Descripteurs français
- Pascal (Inist)
- Structure magnétique, Interaction échange, Diffraction neutron, Théorie groupe, Structure cristalline, Transition paramagnétique antiferromagnétique, Double échange, Diagramme phase magnétique, Interaction superéchange, Longueur liaison, Anisotropie magnétique, Réseau monoclinique, Matériau ferromagnétique, Bismuth cobalt oxyphosphate, Bismuth nickel oxyphosphate, BiCoO(PO4), BiNiO(PO4), Oxyphosphate.
English descriptors
- KwdEn :
- Bond lengths, Crystal structure, Double exchange, Exchange interactions, Ferromagnetic materials, Group theory, Magnetic anisotropy, Magnetic structure, Magnetic-phase diagrams, Monoclinic lattices, Neutron diffraction, Oxyphosphate, Paramagnetic-antiferromagnetic transitions, Superexchange interactions.
Abstract
The magnetic structures of the two bismuth oxy-phosphate compounds BiMPO5 (M2+ = Ni2+, Co2+) have been determined by neutron powder diffraction using group theory analysis as a preliminary tool. Both compounds adopt a monoclinic crystal structure (S.G. P21/n, a = 7.1642(2) Å, b = 11.2038(3) A, c = 5.1740(2) Å and β = 107.296(2)° for Ni2+ and a = 7.2441(1) Å, b = 11.2828(1) Å, c = 5.2258(1) Å and β = 107.841(1)° for Co2+). The refinement of the magnetic structures below TN = 17.5 and 15 K, respectively, for both compounds show that the magnetic structure is characterized by the propagation vector k = (-1/2, 0, 1/2), with components given with respect to the reciprocal lattice of the nuclear structure. This means a magnetic unit cell that is a multiple of the nuclear cell. The magnetic structure is constituted of ferromagnetic pairs of metal ions antiferromagnetically coupled within double chains. The relative strength of the intra and inter double chains exchange interactions has been examined by establishing a theoretical magnetic phase diagram. Most of the interactions come from M-O-O-M super-super-exchange paths. At its ground state, BiNiPO5 shows a nearly collinear arrangement of magnetic moments with m 1.5 K = 2.13(3) μB/Ni. Due to the strong magnetic anisotropy of Co2+ (m1.5 K = 3.52(3) μB/Co), the collinear character is largely lost while the magnetic structure remains analysable on the basis of the greatest isotropic component of the local moments.
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Format Inist (serveur)
| NO : | PASCAL 08-0499458 INIST |
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| ET : | Magnetic structure and analysis of the exchange interactions in BiMO(PO4) (M = Co, Ni) |
| AU : | MENTREL (O.); BOUREE (F.); RODRIGUEZ-CARVAJAL (J.); EL JAZOULI (A.); EL KHAYATI (N.); KETATNI (El M.) |
| AF : | UCCS, Equipe de Chimie du Solide, UMR CNRS 8181, ENSC Lille-UST Lille, BP 90108/59652 Villeneuve d'Ascq/France (1 aut.); Laboratoire Léon Brillouin [CEA-CNRS], CEA/Saclay/91191 Gif sur Yvette/France (2 aut.); Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156/38042 Grenoble/France (3 aut.); LCMS, UFR Sciences des Matériaux Solides, Faculté des Sciences Ben M'Sik/Casablanca/Maroc (4 aut.); Département de Physique, Faculté des Sciences, Avenue Ibn Batouta, BP 1014/Rabat/Maroc (5 aut.); Laboratoire de Spectrochimie Analytique et Environnement, Faculté des Sciences et Techniques, Université Cadi Ayyad, BP 523/Béni Mellal/Maroc (6 aut.) |
| DT : | Publication en série; Niveau analytique |
| SO : | Journal of physics. Condensed matter : (Print); ISSN 0953-8984; Coden JCOMEL; Royaume-Uni; Da. 2008; Vol. 20; No. 41; 415211.1-415211.9; Bibl. 31 ref. |
| LA : | Anglais |
| EA : | The magnetic structures of the two bismuth oxy-phosphate compounds BiMPO5 (M2+ = Ni2+, Co2+) have been determined by neutron powder diffraction using group theory analysis as a preliminary tool. Both compounds adopt a monoclinic crystal structure (S.G. P21/n, a = 7.1642(2) Å, b = 11.2038(3) A, c = 5.1740(2) Å and β = 107.296(2)° for Ni2+ and a = 7.2441(1) Å, b = 11.2828(1) Å, c = 5.2258(1) Å and β = 107.841(1)° for Co2+). The refinement of the magnetic structures below TN = 17.5 and 15 K, respectively, for both compounds show that the magnetic structure is characterized by the propagation vector k = (-1/2, 0, 1/2), with components given with respect to the reciprocal lattice of the nuclear structure. This means a magnetic unit cell that is a multiple of the nuclear cell. The magnetic structure is constituted of ferromagnetic pairs of metal ions antiferromagnetically coupled within double chains. The relative strength of the intra and inter double chains exchange interactions has been examined by establishing a theoretical magnetic phase diagram. Most of the interactions come from M-O-O-M super-super-exchange paths. At its ground state, BiNiPO5 shows a nearly collinear arrangement of magnetic moments with m 1.5 K = 2.13(3) μB/Ni. Due to the strong magnetic anisotropy of Co2+ (m1.5 K = 3.52(3) μB/Co), the collinear character is largely lost while the magnetic structure remains analysable on the basis of the greatest isotropic component of the local moments. |
| CC : | 001B70E25; 001B70E30E |
| FD : | Structure magnétique; Interaction échange; Diffraction neutron; Théorie groupe; Structure cristalline; Transition paramagnétique antiferromagnétique; Double échange; Diagramme phase magnétique; Interaction superéchange; Longueur liaison; Anisotropie magnétique; Réseau monoclinique; Matériau ferromagnétique; Bismuth cobalt oxyphosphate; Bismuth nickel oxyphosphate; BiCoO(PO4); BiNiO(PO4); Oxyphosphate |
| ED : | Magnetic structure; Exchange interactions; Neutron diffraction; Group theory; Crystal structure; Paramagnetic-antiferromagnetic transitions; Double exchange; Magnetic-phase diagrams; Superexchange interactions; Bond lengths; Magnetic anisotropy; Monoclinic lattices; Ferromagnetic materials; Oxyphosphate |
| LO : | INIST-577E2.354000185680980180 |
| ID : | 08-0499458 |
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Rodriguez-Carvajal</name><affiliation><inist:fA14 i1="03"><s1>Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156</s1><s2>38042 Grenoble</s2><s3>FRA</s3><sZ>3 aut.</sZ></inist:fA14></affiliation></author><author><name sortKey="El Jazouli, A" sort="El Jazouli, A" uniqKey="El Jazouli A" first="A." last="El Jazouli">A. El Jazouli</name><affiliation><inist:fA14 i1="04"><s1>LCMS, UFR Sciences des Matériaux Solides, Faculté des Sciences Ben M'Sik</s1><s2>Casablanca</s2><s3>MAR</s3><sZ>4 aut.</sZ></inist:fA14></affiliation></author><author><name sortKey="El Khayati, N" sort="El Khayati, N" uniqKey="El Khayati N" first="N." last="El Khayati">N. El Khayati</name><affiliation><inist:fA14 i1="05"><s1>Département de Physique, Faculté des Sciences, Avenue Ibn Batouta, BP 1014</s1><s2>Rabat</s2><s3>MAR</s3><sZ>5 aut.</sZ></inist:fA14></affiliation></author><author><name sortKey="Ketatni, El M" sort="Ketatni, El M" uniqKey="Ketatni E" first="El M." last="Ketatni">El M. Ketatni</name><affiliation><inist:fA14 i1="06"><s1>Laboratoire de Spectrochimie Analytique et Environnement, Faculté des Sciences et Techniques, Université Cadi Ayyad, BP 523</s1><s2>Béni Mellal</s2><s3>MAR</s3><sZ>6 aut.</sZ></inist:fA14></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">08-0499458</idno><date when="2008">2008</date><idno type="stanalyst">PASCAL 08-0499458 INIST</idno><idno type="RBID">Pascal:08-0499458</idno><idno type="wicri:Area/PascalFrancis/Corpus">000122</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Magnetic structure and analysis of the exchange interactions in BiMO(PO<sub>4</sub>) (M = Co, Ni)</title><author><name sortKey="Mentrel, O" sort="Mentrel, O" uniqKey="Mentrel O" first="O." last="Mentrel">O. Mentrel</name><affiliation><inist:fA14 i1="01"><s1>UCCS, Equipe de Chimie du Solide, UMR CNRS 8181, ENSC Lille-UST Lille, BP 90108</s1><s2>59652 Villeneuve d'Ascq</s2><s3>FRA</s3><sZ>1 aut.</sZ></inist:fA14></affiliation></author><author><name sortKey="Bouree, F" sort="Bouree, F" uniqKey="Bouree F" first="F." last="Bouree">F. Bouree</name><affiliation><inist:fA14 i1="02"><s1>Laboratoire Léon Brillouin [CEA-CNRS], CEA/Saclay</s1><s2>91191 Gif sur Yvette</s2><s3>FRA</s3><sZ>2 aut.</sZ></inist:fA14></affiliation></author><author><name sortKey="Rodriguez Carvajal, J" sort="Rodriguez Carvajal, J" uniqKey="Rodriguez Carvajal J" first="J." last="Rodriguez-Carvajal">J. Rodriguez-Carvajal</name><affiliation><inist:fA14 i1="03"><s1>Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156</s1><s2>38042 Grenoble</s2><s3>FRA</s3><sZ>3 aut.</sZ></inist:fA14></affiliation></author><author><name sortKey="El Jazouli, A" sort="El Jazouli, A" uniqKey="El Jazouli A" first="A." last="El Jazouli">A. El Jazouli</name><affiliation><inist:fA14 i1="04"><s1>LCMS, UFR Sciences des Matériaux Solides, Faculté des Sciences Ben M'Sik</s1><s2>Casablanca</s2><s3>MAR</s3><sZ>4 aut.</sZ></inist:fA14></affiliation></author><author><name sortKey="El Khayati, N" sort="El Khayati, N" uniqKey="El Khayati N" first="N." last="El Khayati">N. El Khayati</name><affiliation><inist:fA14 i1="05"><s1>Département de Physique, Faculté des Sciences, Avenue Ibn Batouta, BP 1014</s1><s2>Rabat</s2><s3>MAR</s3><sZ>5 aut.</sZ></inist:fA14></affiliation></author><author><name sortKey="Ketatni, El M" sort="Ketatni, El M" uniqKey="Ketatni E" first="El M." last="Ketatni">El M. Ketatni</name><affiliation><inist:fA14 i1="06"><s1>Laboratoire de Spectrochimie Analytique et Environnement, Faculté des Sciences et Techniques, Université Cadi Ayyad, BP 523</s1><s2>Béni Mellal</s2><s3>MAR</s3><sZ>6 aut.</sZ></inist:fA14></affiliation></author></analytic><series><title level="j" type="main">Journal of physics. Condensed matter : (Print)</title><title level="j" type="abbreviated">J. phys., Condens. matter : (Print)</title><idno type="ISSN">0953-8984</idno><imprint><date when="2008">2008</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of physics. Condensed matter : (Print)</title><title level="j" type="abbreviated">J. phys., Condens. matter : (Print)</title><idno type="ISSN">0953-8984</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Bond lengths</term><term>Crystal structure</term><term>Double exchange</term><term>Exchange interactions</term><term>Ferromagnetic materials</term><term>Group theory</term><term>Magnetic anisotropy</term><term>Magnetic structure</term><term>Magnetic-phase diagrams</term><term>Monoclinic lattices</term><term>Neutron diffraction</term><term>Oxyphosphate</term><term>Paramagnetic-antiferromagnetic transitions</term><term>Superexchange interactions</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Structure magnétique</term><term>Interaction échange</term><term>Diffraction neutron</term><term>Théorie groupe</term><term>Structure cristalline</term><term>Transition paramagnétique antiferromagnétique</term><term>Double échange</term><term>Diagramme phase magnétique</term><term>Interaction superéchange</term><term>Longueur liaison</term><term>Anisotropie magnétique</term><term>Réseau monoclinique</term><term>Matériau ferromagnétique</term><term>Bismuth cobalt oxyphosphate</term><term>Bismuth nickel oxyphosphate</term><term>BiCoO(PO4)</term><term>BiNiO(PO4)</term><term>Oxyphosphate</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The magnetic structures of the two bismuth oxy-phosphate compounds BiMPO<sub>5</sub> (M<sup>2+</sup> = Ni<sup>2+</sup>, Co<sup>2+</sup>) have been determined by neutron powder diffraction using group theory analysis as a preliminary tool. Both compounds adopt a monoclinic crystal structure (S.G. P2<sub>1</sub>/n, a = 7.1642(2) Å, b = 11.2038(3) A, c = 5.1740(2) Å and β = 107.296(2)° for Ni<sup>2+</sup> and a = 7.2441(1) Å, b = 11.2828(1) Å, c = 5.2258(1) Å and β = 107.841(1)° for Co<sup>2+</sup>). The refinement of the magnetic structures below T<sub>N</sub> = 17.5 and 15 K, respectively, for both compounds show that the magnetic structure is characterized by the propagation vector k = (-1/2, 0, 1/2), with components given with respect to the reciprocal lattice of the nuclear structure. This means a magnetic unit cell that is a multiple of the nuclear cell. The magnetic structure is constituted of ferromagnetic pairs of metal ions antiferromagnetically coupled within double chains. The relative strength of the intra and inter double chains exchange interactions has been examined by establishing a theoretical magnetic phase diagram. Most of the interactions come from M-O-O-M super-super-exchange paths. At its ground state, BiNiPO<sub>5</sub> shows a nearly collinear arrangement of magnetic moments with m <sub>1.5</sub> K = 2.13(3) μ<sub>B</sub>/Ni. Due to the strong magnetic anisotropy of Co<sup>2+</sup> (m<sub>1.5</sub> K = 3.52(3) μ<sub>B</sub>/Co), the collinear character is largely lost while the magnetic structure remains analysable on the basis of the greatest isotropic component of the local moments.</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0953-8984</s0></fA01><fA02 i1="01"><s0>JCOMEL</s0></fA02><fA03 i2="1"><s0>J. phys., Condens. matter : (Print)</s0></fA03><fA05><s2>20</s2></fA05><fA06><s2>41</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>Magnetic structure and analysis of the exchange interactions in BiMO(PO<sub>4</sub>) (M = Co, Ni)</s1></fA08><fA11 i1="01" i2="1"><s1>MENTREL (O.)</s1></fA11><fA11 i1="02" i2="1"><s1>BOUREE (F.)</s1></fA11><fA11 i1="03" i2="1"><s1>RODRIGUEZ-CARVAJAL (J.)</s1></fA11><fA11 i1="04" i2="1"><s1>EL JAZOULI (A.)</s1></fA11><fA11 i1="05" i2="1"><s1>EL KHAYATI (N.)</s1></fA11><fA11 i1="06" i2="1"><s1>KETATNI (El M.)</s1></fA11><fA14 i1="01"><s1>UCCS, Equipe de Chimie du Solide, UMR CNRS 8181, ENSC Lille-UST Lille, BP 90108</s1><s2>59652 Villeneuve d'Ascq</s2><s3>FRA</s3><sZ>1 aut.</sZ></fA14><fA14 i1="02"><s1>Laboratoire Léon Brillouin [CEA-CNRS], CEA/Saclay</s1><s2>91191 Gif sur Yvette</s2><s3>FRA</s3><sZ>2 aut.</sZ></fA14><fA14 i1="03"><s1>Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156</s1><s2>38042 Grenoble</s2><s3>FRA</s3><sZ>3 aut.</sZ></fA14><fA14 i1="04"><s1>LCMS, UFR Sciences des Matériaux Solides, Faculté des Sciences Ben M'Sik</s1><s2>Casablanca</s2><s3>MAR</s3><sZ>4 aut.</sZ></fA14><fA14 i1="05"><s1>Département de Physique, Faculté des Sciences, Avenue Ibn Batouta, BP 1014</s1><s2>Rabat</s2><s3>MAR</s3><sZ>5 aut.</sZ></fA14><fA14 i1="06"><s1>Laboratoire de Spectrochimie Analytique et Environnement, Faculté des Sciences et Techniques, Université Cadi Ayyad, BP 523</s1><s2>Béni Mellal</s2><s3>MAR</s3><sZ>6 aut.</sZ></fA14><fA20><s2>415211.1-415211.9</s2></fA20><fA21><s1>2008</s1></fA21><fA23 i1="01"><s0>ENG</s0></fA23><fA43 i1="01"><s1>INIST</s1><s2>577E2</s2><s5>354000185680980180</s5></fA43><fA44><s0>0000</s0><s1>© 2008 INIST-CNRS. All rights reserved.</s1></fA44><fA45><s0>31 ref.</s0></fA45><fA47 i1="01" i2="1"><s0>08-0499458</s0></fA47><fA60><s1>P</s1></fA60><fA61><s0>A</s0></fA61><fA64 i1="01" i2="1"><s0>Journal of physics. Condensed matter : (Print)</s0></fA64><fA66 i1="01"><s0>GBR</s0></fA66><fC01 i1="01" l="ENG"><s0>The magnetic structures of the two bismuth oxy-phosphate compounds BiMPO<sub>5</sub> (M<sup>2+</sup> = Ni<sup>2+</sup>, Co<sup>2+</sup>) have been determined by neutron powder diffraction using group theory analysis as a preliminary tool. Both compounds adopt a monoclinic crystal structure (S.G. P2<sub>1</sub>/n, a = 7.1642(2) Å, b = 11.2038(3) A, c = 5.1740(2) Å and β = 107.296(2)° for Ni<sup>2+</sup> and a = 7.2441(1) Å, b = 11.2828(1) Å, c = 5.2258(1) Å and β = 107.841(1)° for Co<sup>2+</sup>). The refinement of the magnetic structures below T<sub>N</sub> = 17.5 and 15 K, respectively, for both compounds show that the magnetic structure is characterized by the propagation vector k = (-1/2, 0, 1/2), with components given with respect to the reciprocal lattice of the nuclear structure. This means a magnetic unit cell that is a multiple of the nuclear cell. The magnetic structure is constituted of ferromagnetic pairs of metal ions antiferromagnetically coupled within double chains. The relative strength of the intra and inter double chains exchange interactions has been examined by establishing a theoretical magnetic phase diagram. Most of the interactions come from M-O-O-M super-super-exchange paths. At its ground state, BiNiPO<sub>5</sub> shows a nearly collinear arrangement of magnetic moments with m <sub>1.5</sub> K = 2.13(3) μ<sub>B</sub>/Ni. Due to the strong magnetic anisotropy of Co<sup>2+</sup> (m<sub>1.5</sub> K = 3.52(3) μ<sub>B</sub>/Co), the collinear character is largely lost while the magnetic structure remains analysable on the basis of the greatest isotropic component of the local moments.</s0></fC01><fC02 i1="01" i2="3"><s0>001B70E25</s0></fC02><fC02 i1="02" i2="3"><s0>001B70E30E</s0></fC02><fC03 i1="01" i2="3" l="FRE"><s0>Structure magnétique</s0><s5>02</s5></fC03><fC03 i1="01" i2="3" l="ENG"><s0>Magnetic structure</s0><s5>02</s5></fC03><fC03 i1="02" i2="3" l="FRE"><s0>Interaction échange</s0><s5>03</s5></fC03><fC03 i1="02" i2="3" l="ENG"><s0>Exchange interactions</s0><s5>03</s5></fC03><fC03 i1="03" i2="3" l="FRE"><s0>Diffraction neutron</s0><s5>04</s5></fC03><fC03 i1="03" i2="3" l="ENG"><s0>Neutron diffraction</s0><s5>04</s5></fC03><fC03 i1="04" i2="3" l="FRE"><s0>Théorie groupe</s0><s5>05</s5></fC03><fC03 i1="04" i2="3" l="ENG"><s0>Group theory</s0><s5>05</s5></fC03><fC03 i1="05" i2="3" l="FRE"><s0>Structure cristalline</s0><s5>06</s5></fC03><fC03 i1="05" i2="3" l="ENG"><s0>Crystal structure</s0><s5>06</s5></fC03><fC03 i1="06" i2="3" l="FRE"><s0>Transition paramagnétique antiferromagnétique</s0><s5>07</s5></fC03><fC03 i1="06" i2="3" l="ENG"><s0>Paramagnetic-antiferromagnetic transitions</s0><s5>07</s5></fC03><fC03 i1="07" i2="3" l="FRE"><s0>Double échange</s0><s5>08</s5></fC03><fC03 i1="07" i2="3" l="ENG"><s0>Double exchange</s0><s5>08</s5></fC03><fC03 i1="08" i2="3" l="FRE"><s0>Diagramme phase magnétique</s0><s5>09</s5></fC03><fC03 i1="08" i2="3" l="ENG"><s0>Magnetic-phase diagrams</s0><s5>09</s5></fC03><fC03 i1="09" i2="3" l="FRE"><s0>Interaction superéchange</s0><s5>10</s5></fC03><fC03 i1="09" i2="3" l="ENG"><s0>Superexchange interactions</s0><s5>10</s5></fC03><fC03 i1="10" i2="3" l="FRE"><s0>Longueur liaison</s0><s5>11</s5></fC03><fC03 i1="10" i2="3" l="ENG"><s0>Bond lengths</s0><s5>11</s5></fC03><fC03 i1="11" i2="3" l="FRE"><s0>Anisotropie magnétique</s0><s5>12</s5></fC03><fC03 i1="11" i2="3" l="ENG"><s0>Magnetic anisotropy</s0><s5>12</s5></fC03><fC03 i1="12" i2="3" l="FRE"><s0>Réseau monoclinique</s0><s5>18</s5></fC03><fC03 i1="12" i2="3" l="ENG"><s0>Monoclinic lattices</s0><s5>18</s5></fC03><fC03 i1="13" i2="3" l="FRE"><s0>Matériau ferromagnétique</s0><s5>19</s5></fC03><fC03 i1="13" i2="3" l="ENG"><s0>Ferromagnetic materials</s0><s5>19</s5></fC03><fC03 i1="14" i2="3" l="FRE"><s0>Bismuth cobalt oxyphosphate</s0><s4>INC</s4><s5>63</s5></fC03><fC03 i1="15" i2="3" l="FRE"><s0>Bismuth nickel oxyphosphate</s0><s4>INC</s4><s5>64</s5></fC03><fC03 i1="16" i2="3" l="FRE"><s0>BiCoO(PO4)</s0><s4>INC</s4><s5>65</s5></fC03><fC03 i1="17" i2="3" l="FRE"><s0>BiNiO(PO4)</s0><s4>INC</s4><s5>66</s5></fC03><fC03 i1="18" i2="3" l="FRE"><s0>Oxyphosphate</s0><s4>CD</s4><s5>96</s5></fC03><fC03 i1="18" i2="3" l="ENG"><s0>Oxyphosphate</s0><s4>CD</s4><s5>96</s5></fC03><fN21><s1>329</s1></fN21></pA></standard><server><NO>PASCAL 08-0499458 INIST</NO><ET>Magnetic structure and analysis of the exchange interactions in BiMO(PO<sub>4</sub>) (M = Co, Ni)</ET><AU>MENTREL (O.); BOUREE (F.); RODRIGUEZ-CARVAJAL (J.); EL JAZOULI (A.); EL KHAYATI (N.); KETATNI (El M.)</AU><AF>UCCS, Equipe de Chimie du Solide, UMR CNRS 8181, ENSC Lille-UST Lille, BP 90108/59652 Villeneuve d'Ascq/France (1 aut.); Laboratoire Léon Brillouin [CEA-CNRS], CEA/Saclay/91191 Gif sur Yvette/France (2 aut.); Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156/38042 Grenoble/France (3 aut.); LCMS, UFR Sciences des Matériaux Solides, Faculté des Sciences Ben M'Sik/Casablanca/Maroc (4 aut.); Département de Physique, Faculté des Sciences, Avenue Ibn Batouta, BP 1014/Rabat/Maroc (5 aut.); Laboratoire de Spectrochimie Analytique et Environnement, Faculté des Sciences et Techniques, Université Cadi Ayyad, BP 523/Béni Mellal/Maroc (6 aut.)</AF><DT>Publication en série; Niveau analytique</DT><SO>Journal of physics. Condensed matter : (Print); ISSN 0953-8984; Coden JCOMEL; Royaume-Uni; Da. 2008; Vol. 20; No. 41; 415211.1-415211.9; Bibl. 31 ref.</SO><LA>Anglais</LA><EA>The magnetic structures of the two bismuth oxy-phosphate compounds BiMPO<sub>5</sub> (M<sup>2+</sup> = Ni<sup>2+</sup>, Co<sup>2+</sup>) have been determined by neutron powder diffraction using group theory analysis as a preliminary tool. Both compounds adopt a monoclinic crystal structure (S.G. P2<sub>1</sub>/n, a = 7.1642(2) Å, b = 11.2038(3) A, c = 5.1740(2) Å and β = 107.296(2)° for Ni<sup>2+</sup> and a = 7.2441(1) Å, b = 11.2828(1) Å, c = 5.2258(1) Å and β = 107.841(1)° for Co<sup>2+</sup>). The refinement of the magnetic structures below T<sub>N</sub> = 17.5 and 15 K, respectively, for both compounds show that the magnetic structure is characterized by the propagation vector k = (-1/2, 0, 1/2), with components given with respect to the reciprocal lattice of the nuclear structure. This means a magnetic unit cell that is a multiple of the nuclear cell. The magnetic structure is constituted of ferromagnetic pairs of metal ions antiferromagnetically coupled within double chains. The relative strength of the intra and inter double chains exchange interactions has been examined by establishing a theoretical magnetic phase diagram. Most of the interactions come from M-O-O-M super-super-exchange paths. At its ground state, BiNiPO<sub>5</sub> shows a nearly collinear arrangement of magnetic moments with m <sub>1.5</sub> K = 2.13(3) μ<sub>B</sub>/Ni. Due to the strong magnetic anisotropy of Co<sup>2+</sup> (m<sub>1.5</sub> K = 3.52(3) μ<sub>B</sub>/Co), the collinear character is largely lost while the magnetic structure remains analysable on the basis of the greatest isotropic component of the local moments.</EA><CC>001B70E25; 001B70E30E</CC><FD>Structure magnétique; Interaction échange; Diffraction neutron; Théorie groupe; Structure cristalline; Transition paramagnétique antiferromagnétique; Double échange; Diagramme phase magnétique; Interaction superéchange; Longueur liaison; Anisotropie magnétique; Réseau monoclinique; Matériau ferromagnétique; Bismuth cobalt oxyphosphate; Bismuth nickel oxyphosphate; BiCoO(PO4); BiNiO(PO4); Oxyphosphate</FD><ED>Magnetic structure; Exchange interactions; Neutron diffraction; Group theory; Crystal structure; Paramagnetic-antiferromagnetic transitions; Double exchange; Magnetic-phase diagrams; Superexchange interactions; Bond lengths; Magnetic anisotropy; Monoclinic lattices; Ferromagnetic materials; Oxyphosphate</ED><LO>INIST-577E2.354000185680980180</LO><ID>08-0499458</ID></server></inist></record>Pour manipuler ce document sous Unix (Dilib)
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