Email this article Thermodynamic and High-Temperature Properties of KFe0.33W1.67O6
- Authors: Shvareva A.G.1, Smirnova V.M.2, Smirnova N.N.1, Markin A.V.1, Fukina D.G.1, Knyazev A.V.1
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Affiliations:
- National Research Lobachevsky State University of Nizhny Novgorod
- National Research Ogarev Mordovia State University
- Issue: Vol 97, No 8 (2023)
- Pages: 1087-1096
- Section: ХИМИЧЕСКАЯ ТЕРМОДИНАМИКА И ТЕРМОХИМИЯ
- URL: https://journals.rcsi.science/0044-4537/article/view/136649
- DOI: https://doi.org/10.31857/S0044453723080265
- EDN: https://elibrary.ru/RAAJQP
- ID: 136649
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Abstract
This paper presents the results of a study of the KFe0.33W1.67O6 system. The compound was obtained by a solid-phase synthesis method at a temperature of 1073 K. The structural, morphological, and spectroscopic properties of KFe0.33W1.67O6 were characterized using XRD, SEM-EDS. The compound crystallizes in a cubic lattice with the space group Fd–3m (227). The obtained lattice parameter a = 10.3697 (3) Å. The phase transitions of KFe0.33W1.67O6 were determined by low-temperature and high-temperature X-ray diffraction. The temperature dependence of heat capacity of KFe0.33W1.67O6 has been measured for the first time in the range from 5 to 638 K by precision adiabatic vacuum calorimetry and differential scanning calorimetry. The experimental data were used to calculate standard thermodynamic functions, namely the heat capacity C∘p∘(T), enthalpy H°(T) − H°(0), entropy S°(T) − S°(0), and Gibbs function G°(T) − H°(0), for the range from T → 0 to 630 K.
About the authors
A. G. Shvareva
National Research Lobachevsky State University of Nizhny Novgorod
Email: knyazevav@gmail.com
603950, Nizhny Novgorod, Russia
V. M. Smirnova
National Research Ogarev Mordovia State University
Email: knyazevav@gmail.com
430005, Saransk, Russia
N. N. Smirnova
National Research Lobachevsky State University of Nizhny Novgorod
Email: knyazevav@gmail.com
603950, Nizhny Novgorod, Russia
A. V. Markin
National Research Lobachevsky State University of Nizhny Novgorod
Email: knyazevav@gmail.com
603950, Nizhny Novgorod, Russia
D. G. Fukina
National Research Lobachevsky State University of Nizhny Novgorod
Email: knyazevav@gmail.com
603950, Nizhny Novgorod, Russia
A. V. Knyazev
National Research Lobachevsky State University of Nizhny Novgorod
Author for correspondence.
Email: knyazevav@gmail.com
603950, Nizhny Novgorod, Russia
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