Crystal Structure and Thermodynamic Properties of the RGaTi2O7 (R = Sm, Ho, Tm, Yb) Titanates

— The RGaTi 2 O 7 (R = Sm, Ho, Tm, Yb) substituted titanates have been prepared by solid-state reactions, by firing mixtures of the Ga 2 O 3 , TiO 2 , and R 2 O 3 oxides in air at 1273 and 1573 K, and their crystal structure has been determined using X-ray diffraction. The effect of temperature (320...

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Bibliographic Details
Published in:Inorganic materials 2023-06, Vol.59 (6), p.604-610
Main Authors: Denisova, L. T., Chumilina, L. G., Kargin, Yu. F., Vasil’ev, G. V., Beletskii, V. V., Denisov, V. M.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Crystal structure
Enthalpy
Free energy
Gallium oxides
Heat of formation
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Materials Science
Temperature effects
Thermodynamic properties
Thermodynamics
Titanates
Titanium dioxide
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Summary:— The RGaTi 2 O 7 (R = Sm, Ho, Tm, Yb) substituted titanates have been prepared by solid-state reactions, by firing mixtures of the Ga 2 O 3 , TiO 2 , and R 2 O 3 oxides in air at 1273 and 1573 K, and their crystal structure has been determined using X-ray diffraction. The effect of temperature (320–1000 K) on the heat capacity of the synthesized compounds has been studied by differential scanning calorimetry. The experimental C p ( T ) data have been used to calculate the principal thermodynamic functions of the titanates. Using the group contribution method, we evaluated the standard enthalpy and Gibbs energy of formation of the RGaTi 2 O 7 (R = Sm, Ho, Tm, Yb) titanates.
ISSN:0020-1685
1608-3172
DOI:10.1134/S0020168523060055