Jahn-Teller-type phase transitions in oxide ceramics and other solids with Cu(II) — from the viewpoint of a solid state chemist View Full Text


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Article Info

DATE

1997-12

AUTHORS

D. Reinen, H.O. Wellern, J. Wegwerth

ABSTRACT

After a short outline of the vibronic features of the local Jahn-Teller effect (Eg ⊗ εg coupling) the cooperative aspects — in particular the various order patterns of the elongated octahedra in Cu(II) solids — are reviewed. While the elastic interactions can be described by energy terms of Qε symmetry, the local Jahn-Teller effect has Qθ symmetry (ϕ = 0). Phase transitions in dependence on the Cu(II) concentration are analysed in detail for oxidic ordered perovskites Ba(Sr)2Zn(Ni)1-xCuxW(Te)O6, which exhibit ferrodistortive order patterns connected with first order phase transitions at high x-values. At lower x-values at the short-range order scale elastic Qε-type strains prevail as in the cases of antiferrodistortive order, leading to continuous phase transitions. Here, the cluster distribution has been successfully analysed by EPR spectroscopy. More... »

PAGES

595-600

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s002570050494

DOI

http://dx.doi.org/10.1007/s002570050494

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1043751918


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