Electronic factors influencing the local and cooperative jahn-teller interactions in spinels with Copper(II) and Nickel(II)

M. Atanasov; U. Kesper; B. L. Ramakrishna; D. Reinen

doi:10.1006/jssc.1993.1188

Electronic factors influencing the local and cooperative jahn-teller interactions in spinels with Copper(II) and Nickel(II)

M. Atanasov, U. Kesper, B. L. Ramakrishna, D. Reinen

Engineering of Matter, Transport and Energy, School for (IAFSE-SEMTE)

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

Optical spectra and structural data of mixed crystals Cu_xZn_1-xCr₂O₄, Ni_xZn_1-xCr₂O₄, and Cu_1-xNi_xCr₂O₄ are reported. The optical results are used as a probe characterizing the d -contributions to the Cu-O bonds. The cooperative Jahn-Teller forces are analyzed, extending the statistical model by Wojtowicz to the tetrahedral sublattice. Thermodynamical and optical data are used to estimate the corresponding cooperative strain energies. A microscopic bonding model is proposed which is based on the bonding properties of the oxygen ligands with respect to Cu²⁺ due to the presence of the “contrapolarizing” Cr³⁺ cations. This concept makes it possible to understand the enhancement of the local Jahn-Teller distortions with increasing cooperativeness.

Original language	English (US)
Pages (from-to)	1-18
Number of pages	18
Journal	Journal of Solid State Chemistry
Volume	105
Issue number	1
DOIs	https://doi.org/10.1006/jssc.1993.1188
State	Published - Jul 1993

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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10.1006/jssc.1993.1188

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abstract = "Optical spectra and structural data of mixed crystals CuxZn1-xCr2O4, NixZn1-xCr2O4, and Cu1-xNixCr2O4 are reported. The optical results are used as a probe characterizing the d -contributions to the Cu-O bonds. The cooperative Jahn-Teller forces are analyzed, extending the statistical model by Wojtowicz to the tetrahedral sublattice. Thermodynamical and optical data are used to estimate the corresponding cooperative strain energies. A microscopic bonding model is proposed which is based on the bonding properties of the oxygen ligands with respect to Cu2+ due to the presence of the “contrapolarizing” Cr3+ cations. This concept makes it possible to understand the enhancement of the local Jahn-Teller distortions with increasing cooperativeness.",

author = "M. Atanasov and U. Kesper and Ramakrishna, {B. L.} and D. Reinen",

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T1 - Electronic factors influencing the local and cooperative jahn-teller interactions in spinels with Copper(II) and Nickel(II)

AU - Atanasov, M.

AU - Kesper, U.

AU - Ramakrishna, B. L.

AU - Reinen, D.

PY - 1993/7

Y1 - 1993/7

N2 - Optical spectra and structural data of mixed crystals CuxZn1-xCr2O4, NixZn1-xCr2O4, and Cu1-xNixCr2O4 are reported. The optical results are used as a probe characterizing the d -contributions to the Cu-O bonds. The cooperative Jahn-Teller forces are analyzed, extending the statistical model by Wojtowicz to the tetrahedral sublattice. Thermodynamical and optical data are used to estimate the corresponding cooperative strain energies. A microscopic bonding model is proposed which is based on the bonding properties of the oxygen ligands with respect to Cu2+ due to the presence of the “contrapolarizing” Cr3+ cations. This concept makes it possible to understand the enhancement of the local Jahn-Teller distortions with increasing cooperativeness.

AB - Optical spectra and structural data of mixed crystals CuxZn1-xCr2O4, NixZn1-xCr2O4, and Cu1-xNixCr2O4 are reported. The optical results are used as a probe characterizing the d -contributions to the Cu-O bonds. The cooperative Jahn-Teller forces are analyzed, extending the statistical model by Wojtowicz to the tetrahedral sublattice. Thermodynamical and optical data are used to estimate the corresponding cooperative strain energies. A microscopic bonding model is proposed which is based on the bonding properties of the oxygen ligands with respect to Cu2+ due to the presence of the “contrapolarizing” Cr3+ cations. This concept makes it possible to understand the enhancement of the local Jahn-Teller distortions with increasing cooperativeness.

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Electronic factors influencing the local and cooperative jahn-teller interactions in spinels with Copper(II) and Nickel(II)

Abstract

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