Abstract
Negative volume thermal expansion was found for the monoclinic structure of the solid solution β-Cu2-2xZn2xV2O7 in a wide temperature range from 93 to 673 K: αV· = −31.4(2) · 10−6 K−1 for β-Cu1.6Zn0.4V2O7, αV· = −12.6(4) · 10−6 K−1 for β-Cu0.8Zn1.2V2O7. Precision X-ray studies of β-Cu2-2xZn2xV2O7in situ made it possible to detail the changes in the linear and angular parameters of the structure upon heating. The obtained data set revealed the defining role of changes the symmetry-nonfixed angle of rotation of the vanadium-oxygen tetrahedra in the [V2O7] orthogroups at the initiation of the hinged deformations, leading to the compression of the structure.
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