Тип публикации: статья из журнала
Год издания: 2020
Идентификатор DOI: 10.1134/S0036024420130099
Ключевые слова: apatite-like compounds, high temperature heat capacity, rare-earth elements–lead-containing apatites, solid-phase synthesis, structure
Аннотация: Abstract: The apatite-like Pb9Pr(GeO4)3(VO4)3 and Pb9Sm(GeO4)3(VO4)3 compounds were prepared by solid-phase synthesis using oxides as starting chemicals: PbO, Pr2O3 (Sm2O3), GeO2, and V2O5. The successive annealing was carried out at 773–1073 K in the air. The effect of rare-earth elements on the structure of the Pb9R(GeO4)3(VO4)3 Показать полностью(R = La, Pr, Nd, Sm) apatites and basic thermodynamic functions was investigated. The temperature dependence (350–1050 K) of the heat capacity of the Pr(Sm)-containing apatites has been determined by differential scanning calorimetry. It has been established that the Cp = f(T) curve for the Pb9Pr(GeO4)3(VO4)3 compound has an extremum associated with a polymorphic transformation in the region of 978 K. © 2020, Pleiades Publishing, Ltd.
Журнал: Russian Journal of Physical Chemistry A
Выпуск журнала: Vol. 94, Is. 13
Номера страниц: 2669-2673
ISSN журнала: 00360244
Издатель: Pleiades journals