X-ray diffraction and thermodynamic characteristics for tellurite of the composition Li2CeTeO5

Рустембеков, К. Т.; Bekturganova, A. Zh.

doi:10.1134/s0036024417040252

Cited by 2 publications

(1 citation statement)

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“…As a rule, the temperature dependence of electrophysical properties is observed in ceramic ferroelectrics. The observed anomalous jumps on the curves of the temperature dependence of the resistance of the compounds indicate Type II phase transitions, conditioned by the semiconductor and ferroelectric properties of the new double samarium tellurites [11][12][13]. It is known that an abrupt transition is accompanied by a structure that provides an anomalously fast three-dimensional diffusion of cations [14].…”

Section: Resultsmentioning

confidence: 99%

New Samarium Oxotellurites: Synthesis and Characteristic

Toibek¹,

Rustembekov²,

Fomin³

et al. 2023

Eurasian J. Chem.

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We synthesized samarium oxotellurites SmMTeO4.5 (M — Mg, Ba) by the method of ceramic technology with solid-phase interaction (800–1200 °С) of Sm2O3 and TeO2 oxides with MgCO3 and BaCO3 carbonates. The compounds were characterized by X-ray and electrophysics methods. It has been established that the syn-thesized compounds crystallize in the tetragonal syngony with the following crystallographic characteristics: SmMgTeO4.5 — a = 12.226; c = 5.783 Å, V0un.cell = 864.38 Å3, Z = 4, ρxray. = 2.876, ρpycn. = (2.874±0.002) g∙cm-3; SmBaTeO4.5 — a = 12.717; с = 6.132Å, V0un.cell = 991.62Å3, Z = 4, ρxray. = 3.264, ρpycn. = (3.260±0.004) g∙cm-3; for both tellurites α = β = γ = 90°. The experimental and calculated values of 2 Th and d-sp, X-ray and pycnometric densities, as well as theoretical and experimental values of unit cell volumes are agreed satisfac-torily. Thus, we can confirm correctness and reliability of the results of indexing X-ray patterns of new sa-marium oxotellurites. We found that increase in the ionic radii from Mg to Ba increases the lattice parameters of the synthesized oxotellurites. Oxotellurites are crystallized in the structural types of distorted perovskite Pm3m. Based on the given study samarium oxotellurites can have semiconductor and ferroelectric properties.

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Section: Resultsmentioning

confidence: 99%