Crystal chemistry, single crystal X-ray structure and magnetism of nickel manganese pyrophosphate
Identifieur interne : 000F62 ( Main/Exploration ); précédent : 000F61; suivant : 000F63Crystal chemistry, single crystal X-ray structure and magnetism of nickel manganese pyrophosphate
Auteurs : K. Benkhouja [Maroc] ; M. Zahir [Maroc] ; A. Sadel [Maroc] ; A. Handizi ; A. Boukhari ; E. M. Holt ; J. Aride ; M. Drillon [France]Source :
- Materials research bulletin [ 0025-5408 ] ; 1995.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
A study of the crystal chemistry of the Ni2-xMnxP2O7 systems in powder form, 0 ≤ x ≤ 2, has revealed the existence of three solid solutions. When x < 0.10, the solution is isostructural with low temperature form, α-Ni2P2O7. When 0.10 ≤ x ≤ 0.40, the structure of the solid solution is similar to that of σ-Ni2P2O7. When 0.60 ≤ x ≤ 2, a form similar to β-Ni2P2O7 (or Mn2P2O7) is seen. The single crystal structure of material corresponding to x=0.816 has been determined in monoclinic space group Cm, a = 6.557(3), b = 8.738(5), c = 4.498(3), β = 103.24(1)°, V = 240.6(2) Å3, Z = 2, R/Rw=3.8/5.3% and shows a structural deformation of the parent lattice. The system shows antiferromagnetic interactions at low temperature
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Le document en format XML
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Chemical composition</term>
<term>Crystal structure</term>
<term>Experimental study</term>
<term>Magnetic susceptibility</term>
<term>Manganese Pyrophosphates</term>
<term>Manganese phosphates</term>
<term>Nickel Pyrophosphates</term>
<term>Nickel phosphates</term>
<term>Phase studies</term>
<term>Quaternary compounds</term>
<term>Solid solutions</term>
<term>XRD</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Etude expérimentale</term>
<term>XRD</term>
<term>Structure cristalline</term>
<term>Composé quaternaire</term>
<term>Nickel phosphate</term>
<term>Manganèse phosphate</term>
<term>Nickel Diphosphate</term>
<term>Manganèse Diphosphate</term>
<term>Solution solide</term>
<term>Composition chimique</term>
<term>Etude phase</term>
<term>Susceptibilité magnétique</term>
<term>6166F</term>
<term>7530C</term>
<term>Ni2-xMnxP2O7</term>
<term>Mn Ni O P</term>
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<front><div type="abstract" xml:lang="en">A study of the crystal chemistry of the Ni<sub>2-x</sub>
Mn<sub>x</sub>
P<sub>2</sub>
O<sub>7</sub>
systems in powder form, 0 ≤ x ≤ 2, has revealed the existence of three solid solutions. When x < 0.10, the solution is isostructural with low temperature form, α-Ni<sub>2</sub>
P<sub>2</sub>
O<sub>7</sub>
. When 0.10 ≤ x ≤ 0.40, the structure of the solid solution is similar to that of σ-Ni<sub>2</sub>
P<sub>2</sub>
O<sub>7</sub>
. When 0.60 ≤ x ≤ 2, a form similar to β-Ni<sub>2</sub>
P<sub>2</sub>
O<sub>7</sub>
(or Mn<sub>2</sub>
P<sub>2</sub>
O<sub>7</sub>
) is seen. The single crystal structure of material corresponding to x=0.816 has been determined in monoclinic space group Cm, a = 6.557(3), b = 8.738(5), c = 4.498(3), β = 103.24(1)°, V = 240.6(2) Å<sup>3</sup>
, Z = 2, R/R<sub>w</sub>
=3.8/5.3% and shows a structural deformation of the parent lattice. The system shows antiferromagnetic interactions at low temperature</div>
</front>
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