Электронный каталог

Статья

Koryttseva, A.K.
Thermochemical and Structural Study of Sodium, Iron, and Niobium Phosphate NASICON Solid Solutions / A.K.Koryttseva, A.Navrotsky, A.I.Beskrovnyi, R.E.Smetanina // Journal of Solid State Chemistry [Electronic resource]. – 2024. – Vol. 336. – P. 124742. – URL: https://doi.org/10.1016/j.jssc.2024.124742. – Bibliogr.: 41.

Solid solutions Na&sub(x)Fe&sub(0.5+0.5x)Nb&sub(1.5-0.5x)(PO&sub(4))&sub(3) (0 *{ x *{ 1; x = 2) of NASICON structure (sp.gr. R3-c) and NbOPO&sub(4) were prepared via solid-state reaction and characterized by electron microprobe analysis, powder X-ray and neutron diffraction, and differential thermal analysis. The decrease of the a- and b-unit cell parameter prevails over the increase in c-parameters, resulting in nonlinear decrease of the unit cell volume with Na content. Enthalpies of drop solution in molten sodium molybdate solvent at 700&sup(o) C were measured by high temperature oxide melt solution calorimetry and were used to derive the enthalpies of formation. Strongly negative enthalpies of formation from elements and from constituent oxides indicate high thermodynamic stability. The mixing enthalpies of solid solutions show negative deviation from the ideality. Negative mixing enthalpies and negative mixing volumes indicate short-range ordering of cations in the structure



Спец.(статьи,препринты) = С 45 а - Термодинамические величины элементов и соединений
Спец.(статьи,препринты) = С 332.8 - Синхротронное излучение. Лазеры на свободных электронах. Получение и использование рентгеновских лучей
Спец.(статьи,препринты) = С 342 г1 - Замедление и диффузия нейтронов. Дифракция
ОИЯИ = ОИЯИ (JINR)2024
Ключевых слов = 40/024