New Samarium Oxotellurites: Synthesis and Characteristic
Toibek A.A. Rustembekov K.T. Fomin V.N. Kaikenov D.A.
2023E.A. Buketov Karaganda University Publish house
Eurasian Journal of Chemistry
2023#2023Issue 2107 - 114 pp.
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 synthesized 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 satisfactorily. Thus, we can confirm correctness and reliability of the results of indexing X-ray patterns of new samarium 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.
crystallographic characteristics of the compounds , permittivity , resistance , samarium oxotellurites , synthesis
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Karagandy University of the name of academician E.A. Buketov, Universitetskaya street, 28, Karaganda, 100024, Kazakhstan
Laboratory of the engineering profile “Physical and chemical methods of research”, Karagandy University of the name of academician E.A. Buketov, Universitetskaya street, 28, Karaganda, 100024, Kazakhstan
Karagandy University of the name of academician E.A. Buketov
Laboratory of the engineering profile “Physical and chemical methods of research”
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