Synthesis and properties of double gadolinium tellurites
Синтез и свойства двойных теллуритов гадолиния
Toibek A.A. Rustembekov K.T. Kaikenov D.A. Stoev M.
2021E.A.Buketov Karaganda State University Publish House
Bulletin of the Karaganda University Chemistry Series
2021#103Issue 367 - 73 pp.
For the first time, double gadolinium tellurites of the composition GdMIITeO4.5 (MII — Sr, Ba) were synthesized by the solid-phase method. The solid-phase synthesis of samples was carried out from decrepitated gadolinium (III) and tellurium (IV) oxides, strontium, and barium carbonates according to the standard ceramic technology. The synthesis was carried out in the temperature range of 800-1100 °C. The samples obtained were confirmed by X-ray phase analysis. X-ray phase analysis was carried out on an Empyrean instrument in the XRDML Pananalitical format. The intensity of the diffraction maxima was estimated on a 100-point scale. X-ray diffraction patterns indexing of the powder of gadolinium tellurites — alkaline earth metals studied were carried out by the homology method. The reliability and correctness of the results of indexing the X-ray diffraction patterns are confirmed by the good agreement between the experimental and calculated values of the interplanar distances (d) and the agreement between the values of the X-ray and pycnometric densities. It was found that compounds GdSrTeO4.5 and GdBaTeO4.5 crystallize in the monoclinic system and have the unit cell parameters, namely GdSrTeO4.5 — a = 12.7610, b = 10.4289, c = 8.6235 Å, V° = 1141.83 Å3, β = 95.77°, Z = 5, ρrent. = 3.22, ρpikn. = (3.10±0.09) g/cm3; GdBaTeO4.5 — a = 15.7272, b = 15.8351, c = 7.1393 Å, V° = 1769.72 Å3, β = 95.53°, Z = 8, ρrent = 3.71, ρpick = (3.61±0.10) g/cm3. Using the Landiya method, the standard heat capacities of the compounds were estimated from the calculated values of the standard entropies, and the temperature dependences of the heat capacities of the gadolinium tellurites synthesized were determined in the temperature range of 298–850 K.
Crystal system , Double gadolinium tellurites , Heat capacity , Lattice parameters , X-ray phase analysis
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Faculty of Chemistry, Karagandy University of the name of academician E.A. Buketov, Universitetskaya str., 28, Karaganda, 100024, Kazakhstan
Karagandy University of the name of academician E.A. Buketov, Universitetskaya str., 28, Karaganda, 100024, Kazakhstan
“Physical and chemical methods of research”, Karagandy University of the name of academician E.A. Buketov, Universitetskaya str., 28, Karaganda, 100024, Kazakhstan
South-West University “Neofit Rilski”, Blagoevgrad, Bulgaria
Faculty of Chemistry
Karagandy University of the name of academician E.A. Buketov
“Physical and chemical methods of research”
South-West University “Neofit Rilski”
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