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Crystal chemistry and magnetic properties of the K2NiF4 type diluted solid solution YCaAl1-xCrxO4 (0 ≤ x≤ 0.10) : evidence for Cr3+ clustering. / Archaimbault, F.; Choisnet, J.; Zvereva, I.
In: Materials Chemistry and Physics, Vol. 34, No. 3-4, 1993, p. 300-305.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Crystal chemistry and magnetic properties of the K2NiF4 type diluted solid solution YCaAl1-xCrxO4 (0 ≤ x≤ 0.10)
T2 - evidence for Cr3+ clustering
AU - Archaimbault, F.
AU - Choisnet, J.
AU - Zvereva, I.
PY - 1993
Y1 - 1993
N2 - The K2NiF4 type diluted solution YCa(Al1-xCrx)O4 (0 ≤ x ≤ 0.10) is studied with respect to both crystal chemistry and magnetic properties, mainly in order to obtain some evidence of Cr3+ segregation phenomena in the octahedral layers. The Al3+ → Cr3+ replacement results in a strong anisotropic variation of the cell constants in terms of an increase and a decrease in the a and c parameters, respectively, of the tetragonal cell. Such behaviour is largely dependent on the M-Oapical distances in the (Al,Cr)-O6 octahedra, as well as in the (Y,Ca)-O9 polyhedra, which show a coupling of their variation. On the basis of the temperature (80, 400 K) and Cr3+ concentration dependence of the magnetic susceptibility, which is used in the Heisenberg-Dirac-Van Vleck approach for modeling the magnetic exchange interactions, a significant deviation of the Cr3+ distribution is found with respect to a statistical distribution. The amount of Cr3+ clusters is lower than in the perovskite solid solution YAl1-xCrxO3, owing to the lower dimensionality of the K2NiF4 type structure of the YCaAl1-xCrxO4 series. The 2D character of the exchange interactions is found to be stronger than in pure chromite, YCaCrO4.
AB - The K2NiF4 type diluted solution YCa(Al1-xCrx)O4 (0 ≤ x ≤ 0.10) is studied with respect to both crystal chemistry and magnetic properties, mainly in order to obtain some evidence of Cr3+ segregation phenomena in the octahedral layers. The Al3+ → Cr3+ replacement results in a strong anisotropic variation of the cell constants in terms of an increase and a decrease in the a and c parameters, respectively, of the tetragonal cell. Such behaviour is largely dependent on the M-Oapical distances in the (Al,Cr)-O6 octahedra, as well as in the (Y,Ca)-O9 polyhedra, which show a coupling of their variation. On the basis of the temperature (80, 400 K) and Cr3+ concentration dependence of the magnetic susceptibility, which is used in the Heisenberg-Dirac-Van Vleck approach for modeling the magnetic exchange interactions, a significant deviation of the Cr3+ distribution is found with respect to a statistical distribution. The amount of Cr3+ clusters is lower than in the perovskite solid solution YAl1-xCrxO3, owing to the lower dimensionality of the K2NiF4 type structure of the YCaAl1-xCrxO4 series. The 2D character of the exchange interactions is found to be stronger than in pure chromite, YCaCrO4.
UR - http://www.scopus.com/inward/record.url?scp=0027608477&partnerID=8YFLogxK
U2 - 10.1016/0254-0584(93)90051-M
DO - 10.1016/0254-0584(93)90051-M
M3 - Article
AN - SCOPUS:0027608477
VL - 34
SP - 300
EP - 305
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
SN - 0254-0584
IS - 3-4
ER -
ID: 88615023