Anion-Substituted Garnets Ca3Mn2 – x(Ni, Co)xVyGe3 – yO12 (x = 0, 1; y = 0, 1, 2): Preparation and Characterization


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Abstract

Garnets with the structure similar to that of Ca3Mn2Ge3O12 have been prepared with simultaneous substitutions of Ge4+ by V5+ in tetrahedra and of Mn3+ by Ni2+ or Co2+ in octahedra. X-ray photoelectron spectroscopy (XPS) proved the absence of V4+ in tetrahedra of the lattice of the compounds prepared and determined the valences of elements in octahedral sites. The increasing d-cation size in octahedra is accompanied by an increase in unit cell volume regardless of the composition of tetrahedra (VyGe3 – y)O12. The electrical conductivity of Ca3Mn2 – x(Ni, Co)xVyGe3–yO12 (x = 0, 1; y = 0, 1, 2) garnet ceramic samples and the calculated bandgap widths make it possible to classify them with medium-gap semiconductors.

About the authors

Sh. M. Khaliullin

Institute of Solid State Chemistry, Ural Branch

Author for correspondence.
Email: khaliullin@ihim.uran.ru
Russian Federation, Yekaterinburg, 620990

N. I. Lobachevskaya

Institute of Solid State Chemistry, Ural Branch

Email: khaliullin@ihim.uran.ru
Russian Federation, Yekaterinburg, 620990

M. V. Kuznetsov

Institute of Solid State Chemistry, Ural Branch

Email: khaliullin@ihim.uran.ru
Russian Federation, Yekaterinburg, 620990

V. G. Bamburov

Institute of Solid State Chemistry, Ural Branch

Email: khaliullin@ihim.uran.ru
Russian Federation, Yekaterinburg, 620990

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