Cooperative Jahn-Teller effect and the role of strain in the tetragonal-to-cubic phase transition in Mg _x Cu_1 - x Cr₂O₄.

ABSTRACT: Temperature and composition dependences of the I4₁/amd → [Formula: see text] phase transition in the Mg _x Cu_1 - x Cr₂O₄ spinel solid solution, due to the melting of the cooperative Jahn-Teller distortion, have been studied by means of single-crystal X-ray diffraction. Crystals with x = 0, 0.10, 0.18, 0.43, 0.46, 0.53, 1 were grown by flux decomposition methods. All crystals have been refined in the tetragonal I4₁/amd space group except for the Mg end-member, which has cubic symmetry. In Mg _x Cu_1 - x Cr₂O₄ the progressive substitution of the Jahn-Teller, d⁹ Cu²⁺ cation with spherical and clos

SUBMITTER: Tarantino SC 

PROVIDER: S-EPMC5391857 | biostudies-literature | 2016 Sep

REPOSITORIES: biostudies-literature