CobaltMaghrebV1, PascalFrancis, Curation, bibRecord, 000359

Cationic distribution and oxidation mechanism of trivalent manganese ions in submicrometer MnxCoFe2-xO4 spinel ferrites

Identifieur interne : 000359 ( PascalFrancis/Curation ); précédent : 000358; suivant : 000360

Cationic distribution and oxidation mechanism of trivalent manganese ions in submicrometer MnxCoFe2-xO4 spinel ferrites

Auteurs : M. Laarj [Maroc] ; S. Kacim [Maroc] ; B. Gillot [France]

Source :

Journal of solid state chemistry [ 0022-4596 ] ; 1996.

RBID : Pascal:96-0377530

Descripteurs français

Pascal (Inist)
- Etude expérimentale, Cristallochimie, Oxydation, Mécanisme réaction, Distribution ion, Particule fine, Composé quaternaire, Ferrites spinelles, Solution solide, Composition chimique, Manganèse oxyde, Cobalt oxyde, Fer oxyde, Forme sphérique, Valence, Paramètre cristallin, XRD, Conductivité électrique, Spectre IR, TGA, Réaction topotactique, 6166F, MnxCoFe2-xO4, Co Fe Mn O.
Wicri :
- geographic : Valence (Drôme).

English descriptors

KwdEn :
- Chemical composition, Cobalt oxides, Crystal chemistry, Electric conductivity, Experimental study, Ferrites spinels, Fine particle, Infrared spectra, Ion distribution, Iron oxides, Lattice parameters, Manganese oxides, Oxidation, Quaternary compounds, Reaction mechanism, Solid solutions, Spherical shape, TGA, Topotactic reaction, Valence, XRD.

Abstract

Submicrometer Mn_XCoFe₂-_xO₄ (0 ≤ x < 1) spinel particles with a spherical shape were prepared at low temperature from oxalic precursors. Because of their small crystallite size (about 50 nm), these ferrite particles can be oxidized below 400°C giving cubic deficient spinels having both Mn³⁺ and Mn⁴⁺ ions because of oxido-reduction phenomena. Information about the valence state of the manganese and cobalt ions and cation distribution between tetrahedral (A) and octahedral (B) sites are derived from lattice parameter variation, IR spectroscopy, thermogravimetric analysis, and electrical conductivity. A kinetics study of the oxidation of Mn³⁺ ions shows that oxidation proceeds by cation diffusion through a topotactic reaction with a constant chemical diffusion coefficient for x < 0.60 and variable above x = 0.80 and an activation energy close to 115 kJ mol^-1 but, however, depending on manganese substitution content.

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A05				`@2 125`
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A08	`01`	`1`	`ENG`	`@1 Cationic distribution and oxidation mechanism of trivalent manganese ions in submicrometer Mn_xCoFe_2-xO₄ spinel ferrites`
A11	`01`	`1`		`@1 LAARJ (M.)`
A11	`02`	`1`		`@1 KACIM (S.)`
A11	`03`	`1`		`@1 GILLOT (B.)`
A14	`01`			`@1 Département de Chimie, Faculté des Sciences Semlalia, B.P. S15 @2 Marrakech @3 MAR @Z 1 aut. @Z 2 aut.`
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A64	`01`	`1`		`@0 Journal of solid state chemistry`
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C01	`01`		`ENG`	@0 Submicrometer Mn_XCoFe₂-_xO₄ (0 ≤ x < 1) spinel particles with a spherical shape were prepared at low temperature from oxalic precursors. Because of their small crystallite size (about 50 nm), these ferrite particles can be oxidized below 400°C giving cubic deficient spinels having both Mn³⁺ and Mn⁴⁺ ions because of oxido-reduction phenomena. Information about the valence state of the manganese and cobalt ions and cation distribution between tetrahedral (A) and octahedral (B) sites are derived from lattice parameter variation, IR spectroscopy, thermogravimetric analysis, and electrical conductivity. A kinetics study of the oxidation of Mn³⁺ ions shows that oxidation proceeds by cation diffusion through a topotactic reaction with a constant chemical diffusion coefficient for x < 0.60 and variable above x = 0.80 and an activation energy close to 115 kJ mol^-1 but, however, depending on manganese substitution content.
C02	`01`	`3`		`@0 001B60A66F1`
C03	`01`	`3`	`FRE`	`@0 Etude expérimentale @5 01`
C03	`01`	`3`	`ENG`	`@0 Experimental study @5 01`
C03	`02`	`X`	`FRE`	`@0 Cristallochimie @5 02`
C03	`02`	`X`	`ENG`	`@0 Crystal chemistry @5 02`
C03	`02`	`X`	`SPA`	`@0 Cristaloquímica @5 02`
C03	`03`	`3`	`FRE`	`@0 Oxydation @5 03`
C03	`03`	`3`	`ENG`	`@0 Oxidation @5 03`
C03	`04`	`X`	`FRE`	`@0 Mécanisme réaction @5 04`
C03	`04`	`X`	`ENG`	`@0 Reaction mechanism @5 04`
C03	`04`	`X`	`SPA`	`@0 Mecanismo reacción @5 04`
C03	`05`	`X`	`FRE`	`@0 Distribution ion @5 05`
C03	`05`	`X`	`ENG`	`@0 Ion distribution @5 05`
C03	`05`	`X`	`SPA`	`@0 Distribución ión @5 05`
C03	`06`	`X`	`FRE`	`@0 Particule fine @5 06`
C03	`06`	`X`	`ENG`	`@0 Fine particle @5 06`
C03	`06`	`X`	`SPA`	`@0 Partícula fina @5 06`
C03	`07`	`3`	`FRE`	`@0 Composé quaternaire @5 08`
C03	`07`	`3`	`ENG`	`@0 Quaternary compounds @5 08`
C03	`08`	`X`	`FRE`	`@0 Ferrites spinelles @5 09`
C03	`08`	`X`	`ENG`	`@0 Ferrites spinels @5 09`
C03	`08`	`X`	`SPA`	`@0 Feritas espinelas @5 09`
C03	`09`	`3`	`FRE`	`@0 Solution solide @5 11`
C03	`09`	`3`	`ENG`	`@0 Solid solutions @5 11`
C03	`10`	`3`	`FRE`	`@0 Composition chimique @5 12`
C03	`10`	`3`	`ENG`	`@0 Chemical composition @5 12`
C03	`11`	`3`	`FRE`	`@0 Manganèse oxyde @2 NK @5 13`
C03	`11`	`3`	`ENG`	`@0 Manganese oxides @2 NK @5 13`
C03	`12`	`3`	`FRE`	`@0 Cobalt oxyde @2 NK @5 14`
C03	`12`	`3`	`ENG`	`@0 Cobalt oxides @2 NK @5 14`
C03	`13`	`3`	`FRE`	`@0 Fer oxyde @2 NK @5 15`
C03	`13`	`3`	`ENG`	`@0 Iron oxides @2 NK @5 15`
C03	`14`	`X`	`FRE`	`@0 Forme sphérique @5 16`
C03	`14`	`X`	`ENG`	`@0 Spherical shape @5 16`
C03	`14`	`X`	`SPA`	`@0 Forma esférica @5 16`
C03	`15`	`3`	`FRE`	`@0 Valence @5 17`
C03	`15`	`3`	`ENG`	`@0 Valence @5 17`
C03	`16`	`3`	`FRE`	`@0 Paramètre cristallin @5 18`
C03	`16`	`3`	`ENG`	`@0 Lattice parameters @5 18`
C03	`17`	`3`	`FRE`	`@0 XRD @5 19`
C03	`17`	`3`	`ENG`	`@0 XRD @5 19`
C03	`18`	`3`	`FRE`	`@0 Conductivité électrique @5 20`
C03	`18`	`3`	`ENG`	`@0 Electric conductivity @5 20`
C03	`19`	`3`	`FRE`	`@0 Spectre IR @5 21`
C03	`19`	`3`	`ENG`	`@0 Infrared spectra @5 21`
C03	`20`	`3`	`FRE`	`@0 TGA @5 22`
C03	`20`	`3`	`ENG`	`@0 TGA @5 22`
C03	`21`	`X`	`FRE`	`@0 Réaction topotactique @5 23`
C03	`21`	`X`	`ENG`	`@0 Topotactic reaction @5 23`
C03	`21`	`X`	`SPA`	`@0 Reacción topotáctica @5 23`
C03	`22`	`3`	`FRE`	`@0 6166F @2 PAC @4 INC @5 56`
C03	`23`	`3`	`FRE`	`@0 MnxCoFe2-xO4 @4 INC @5 92`
C03	`24`	`3`	`FRE`	`@0 Co Fe Mn O @4 INC @5 93`
C07	`01`	`3`	`FRE`	`@0 Composé minéral @5 07`
C07	`01`	`3`	`ENG`	`@0 Inorganic compounds @5 07`
C07	`02`	`3`	`FRE`	`@0 Métal transition composé @5 10`
C07	`02`	`3`	`ENG`	`@0 Transition element compounds @5 10`
N21				`@1 260`

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Le document en format XML

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CoFe<sub>2-x</sub>
O<sub>4</sub>
 spinel ferrites</title>
<author><name sortKey="Laarj, M" sort="Laarj, M" uniqKey="Laarj M" first="M." last="Laarj">M. Laarj</name>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Cationic distribution and oxidation mechanism of trivalent manganese ions in submicrometer Mn<sub>x</sub>
CoFe<sub>2-x</sub>
O<sub>4</sub>
 spinel ferrites</title>
<author><name sortKey="Laarj, M" sort="Laarj, M" uniqKey="Laarj M" first="M." last="Laarj">M. Laarj</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Département de Chimie, Faculté des Sciences Semlalia, B.P. S15</s1>
<s2>Marrakech</s2>
<s3>MAR</s3>
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<country>Maroc</country>
</affiliation>
</author>
<author><name sortKey="Kacim, S" sort="Kacim, S" uniqKey="Kacim S" first="S." last="Kacim">S. Kacim</name>
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<affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Laboratoire de Recherche sur la réactivité des Solides, URA 23 Faculté des Sciences Mirandes, B.P. 138</s1>
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<s3>FRA</s3>
<sZ>3 aut.</sZ>
</inist:fA14>
<country>France</country>
</affiliation>
</author>
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<series><title level="j" type="main">Journal of solid state chemistry</title>
<title level="j" type="abbreviated">J. solid state chem.</title>
<idno type="ISSN">0022-4596</idno>
<imprint><date when="1996">1996</date>
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<seriesStmt><title level="j" type="main">Journal of solid state chemistry</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Chemical composition</term>
<term>Cobalt oxides</term>
<term>Crystal chemistry</term>
<term>Electric conductivity</term>
<term>Experimental study</term>
<term>Ferrites spinels</term>
<term>Fine particle</term>
<term>Infrared spectra</term>
<term>Ion distribution</term>
<term>Iron oxides</term>
<term>Lattice parameters</term>
<term>Manganese oxides</term>
<term>Oxidation</term>
<term>Quaternary compounds</term>
<term>Reaction mechanism</term>
<term>Solid solutions</term>
<term>Spherical shape</term>
<term>TGA</term>
<term>Topotactic reaction</term>
<term>Valence</term>
<term>XRD</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Etude expérimentale</term>
<term>Cristallochimie</term>
<term>Oxydation</term>
<term>Mécanisme réaction</term>
<term>Distribution ion</term>
<term>Particule fine</term>
<term>Composé quaternaire</term>
<term>Ferrites spinelles</term>
<term>Solution solide</term>
<term>Composition chimique</term>
<term>Manganèse oxyde</term>
<term>Cobalt oxyde</term>
<term>Fer oxyde</term>
<term>Forme sphérique</term>
<term>Valence</term>
<term>Paramètre cristallin</term>
<term>XRD</term>
<term>Conductivité électrique</term>
<term>Spectre IR</term>
<term>TGA</term>
<term>Réaction topotactique</term>
<term>6166F</term>
<term>MnxCoFe2-xO4</term>
<term>Co Fe Mn O</term>
</keywords>
<keywords scheme="Wicri" type="geographic" xml:lang="fr"><term>Valence (Drôme)</term>
</keywords>
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<front><div type="abstract" xml:lang="en">Submicrometer Mn<sub>X</sub>
CoFe<sub>2</sub>
-<sub>x</sub>
O<sub>4</sub>
 (0 ≤ x < 1) spinel particles with a spherical shape were prepared at low temperature from oxalic precursors. Because of their small crystallite size (about 50 nm), these ferrite particles can be oxidized below 400°C giving cubic deficient spinels having both Mn<sup>3+</sup>
 and Mn<sup>4+</sup>
 ions because of oxido-reduction phenomena. Information about the valence state of the manganese and cobalt ions and cation distribution between tetrahedral (A) and octahedral (B) sites are derived from lattice parameter variation, IR spectroscopy, thermogravimetric analysis, and electrical conductivity. A kinetics study of the oxidation of Mn<sup>3+</sup>
 ions shows that oxidation proceeds by cation diffusion through a topotactic reaction with a constant chemical diffusion coefficient for x < 0.60 and variable above x = 0.80 and an activation energy close to 115 kJ mol<sup>-1</sup>
 but, however, depending on manganese substitution content.</div>
</front>
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O<sub>4</sub>
 spinel ferrites</s1>
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<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
</fA14>
<fA14 i1="02"><s1>Laboratoire de Recherche sur la réactivité des Solides, URA 23 Faculté des Sciences Mirandes, B.P. 138</s1>
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<fC01 i1="01" l="ENG"><s0>Submicrometer Mn<sub>X</sub>
CoFe<sub>2</sub>
-<sub>x</sub>
O<sub>4</sub>
 (0 ≤ x < 1) spinel particles with a spherical shape were prepared at low temperature from oxalic precursors. Because of their small crystallite size (about 50 nm), these ferrite particles can be oxidized below 400°C giving cubic deficient spinels having both Mn<sup>3+</sup>
 and Mn<sup>4+</sup>
 ions because of oxido-reduction phenomena. Information about the valence state of the manganese and cobalt ions and cation distribution between tetrahedral (A) and octahedral (B) sites are derived from lattice parameter variation, IR spectroscopy, thermogravimetric analysis, and electrical conductivity. A kinetics study of the oxidation of Mn<sup>3+</sup>
 ions shows that oxidation proceeds by cation diffusion through a topotactic reaction with a constant chemical diffusion coefficient for x < 0.60 and variable above x = 0.80 and an activation energy close to 115 kJ mol<sup>-1</sup>
 but, however, depending on manganese substitution content.</s0>
</fC01>
<fC02 i1="01" i2="3"><s0>001B60A66F1</s0>
</fC02>
<fC03 i1="01" i2="3" l="FRE"><s0>Etude expérimentale</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="3" l="ENG"><s0>Experimental study</s0>
<s5>01</s5>
</fC03>
<fC03 i1="02" i2="X" l="FRE"><s0>Cristallochimie</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="X" l="ENG"><s0>Crystal chemistry</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="X" l="SPA"><s0>Cristaloquímica</s0>
<s5>02</s5>
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<s5>03</s5>
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<s5>03</s5>
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<fC03 i1="04" i2="X" l="FRE"><s0>Mécanisme réaction</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="X" l="ENG"><s0>Reaction mechanism</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="X" l="SPA"><s0>Mecanismo reacción</s0>
<s5>04</s5>
</fC03>
<fC03 i1="05" i2="X" l="FRE"><s0>Distribution ion</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="X" l="ENG"><s0>Ion distribution</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="X" l="SPA"><s0>Distribución ión</s0>
<s5>05</s5>
</fC03>
<fC03 i1="06" i2="X" l="FRE"><s0>Particule fine</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="X" l="ENG"><s0>Fine particle</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="X" l="SPA"><s0>Partícula fina</s0>
<s5>06</s5>
</fC03>
<fC03 i1="07" i2="3" l="FRE"><s0>Composé quaternaire</s0>
<s5>08</s5>
</fC03>
<fC03 i1="07" i2="3" l="ENG"><s0>Quaternary compounds</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="FRE"><s0>Ferrites spinelles</s0>
<s5>09</s5>
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<fC03 i1="08" i2="X" l="ENG"><s0>Ferrites spinels</s0>
<s5>09</s5>
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<fC03 i1="08" i2="X" l="SPA"><s0>Feritas espinelas</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="3" l="FRE"><s0>Solution solide</s0>
<s5>11</s5>
</fC03>
<fC03 i1="09" i2="3" l="ENG"><s0>Solid solutions</s0>
<s5>11</s5>
</fC03>
<fC03 i1="10" i2="3" l="FRE"><s0>Composition chimique</s0>
<s5>12</s5>
</fC03>
<fC03 i1="10" i2="3" l="ENG"><s0>Chemical composition</s0>
<s5>12</s5>
</fC03>
<fC03 i1="11" i2="3" l="FRE"><s0>Manganèse oxyde</s0>
<s2>NK</s2>
<s5>13</s5>
</fC03>
<fC03 i1="11" i2="3" l="ENG"><s0>Manganese oxides</s0>
<s2>NK</s2>
<s5>13</s5>
</fC03>
<fC03 i1="12" i2="3" l="FRE"><s0>Cobalt oxyde</s0>
<s2>NK</s2>
<s5>14</s5>
</fC03>
<fC03 i1="12" i2="3" l="ENG"><s0>Cobalt oxides</s0>
<s2>NK</s2>
<s5>14</s5>
</fC03>
<fC03 i1="13" i2="3" l="FRE"><s0>Fer oxyde</s0>
<s2>NK</s2>
<s5>15</s5>
</fC03>
<fC03 i1="13" i2="3" l="ENG"><s0>Iron oxides</s0>
<s2>NK</s2>
<s5>15</s5>
</fC03>
<fC03 i1="14" i2="X" l="FRE"><s0>Forme sphérique</s0>
<s5>16</s5>
</fC03>
<fC03 i1="14" i2="X" l="ENG"><s0>Spherical shape</s0>
<s5>16</s5>
</fC03>
<fC03 i1="14" i2="X" l="SPA"><s0>Forma esférica</s0>
<s5>16</s5>
</fC03>
<fC03 i1="15" i2="3" l="FRE"><s0>Valence</s0>
<s5>17</s5>
</fC03>
<fC03 i1="15" i2="3" l="ENG"><s0>Valence</s0>
<s5>17</s5>
</fC03>
<fC03 i1="16" i2="3" l="FRE"><s0>Paramètre cristallin</s0>
<s5>18</s5>
</fC03>
<fC03 i1="16" i2="3" l="ENG"><s0>Lattice parameters</s0>
<s5>18</s5>
</fC03>
<fC03 i1="17" i2="3" l="FRE"><s0>XRD</s0>
<s5>19</s5>
</fC03>
<fC03 i1="17" i2="3" l="ENG"><s0>XRD</s0>
<s5>19</s5>
</fC03>
<fC03 i1="18" i2="3" l="FRE"><s0>Conductivité électrique</s0>
<s5>20</s5>
</fC03>
<fC03 i1="18" i2="3" l="ENG"><s0>Electric conductivity</s0>
<s5>20</s5>
</fC03>
<fC03 i1="19" i2="3" l="FRE"><s0>Spectre IR</s0>
<s5>21</s5>
</fC03>
<fC03 i1="19" i2="3" l="ENG"><s0>Infrared spectra</s0>
<s5>21</s5>
</fC03>
<fC03 i1="20" i2="3" l="FRE"><s0>TGA</s0>
<s5>22</s5>
</fC03>
<fC03 i1="20" i2="3" l="ENG"><s0>TGA</s0>
<s5>22</s5>
</fC03>
<fC03 i1="21" i2="X" l="FRE"><s0>Réaction topotactique</s0>
<s5>23</s5>
</fC03>
<fC03 i1="21" i2="X" l="ENG"><s0>Topotactic reaction</s0>
<s5>23</s5>
</fC03>
<fC03 i1="21" i2="X" l="SPA"><s0>Reacción topotáctica</s0>
<s5>23</s5>
</fC03>
<fC03 i1="22" i2="3" l="FRE"><s0>6166F</s0>
<s2>PAC</s2>
<s4>INC</s4>
<s5>56</s5>
</fC03>
<fC03 i1="23" i2="3" l="FRE"><s0>MnxCoFe2-xO4</s0>
<s4>INC</s4>
<s5>92</s5>
</fC03>
<fC03 i1="24" i2="3" l="FRE"><s0>Co Fe Mn O</s0>
<s4>INC</s4>
<s5>93</s5>
</fC03>
<fC07 i1="01" i2="3" l="FRE"><s0>Composé minéral</s0>
<s5>07</s5>
</fC07>
<fC07 i1="01" i2="3" l="ENG"><s0>Inorganic compounds</s0>
<s5>07</s5>
</fC07>
<fC07 i1="02" i2="3" l="FRE"><s0>Métal transition composé</s0>
<s5>10</s5>
</fC07>
<fC07 i1="02" i2="3" l="ENG"><s0>Transition element compounds</s0>
<s5>10</s5>
</fC07>
<fN21><s1>260</s1>
</fN21>
</pA>
</standard>
</inist>
</record>

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Cationic distribution and oxidation mechanism of trivalent manganese ions in submicrometer MnxCoFe2-xO4 spinel ferrites

Cationic distribution and oxidation mechanism of trivalent manganese ions in submicrometer MnxCoFe2-xO4 spinel ferrites

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