Syntesis and thermochemistry of new metal-mixed tellurites

Рустембеков, К. Т.; Dyusekeyeva, A.; Sharipova, Z. M.; Amanzhan, A.

doi:10.15328/chemb_2012_1170-174

Cited by 1 publication

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“…As a rule, the temperature dependence of electrophysical properties is observed in ceramic ferroelectrics. For this purpose, we studied the temperature dependences of the permittivity and resistance of the synthesized tellurites in the range of 293-483 K according to the procedure [8].…”

Section: Resultsmentioning

confidence: 99%

“…We carried out the study of electrical propertiespermittivity and resistance in the range of 293-483 K by measuring the electrical capacitance of the samples on an LCR-800 instrument (Taiwan) at an operating frequency of 1; 5 and 10 kHz continuously in dry air in thermostatic mode with holding time at each fixed temperature. The preparation of samples and their study were carried out according to the method published earlier in this work [8].…”

Section: Methodsmentioning

confidence: 99%

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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%

Section: Methodsmentioning

confidence: 99%