Thermal and electrical properties of Ca5Mg4−xZnx(VO4)6 (0 ≤ x ≤ 4)

• Published in: Journal of thermal analysis and calorimetry Vol. 136; no. 3; pp. 1003 - 1009
• Main Authors: Tolkacheva, Anna S., Shkerin, Sergey N., Zemlyanoi, Kirill G., Reznitskikh, Olga G., Pershina, Svetlana V., Khavlyuk, Pavel D.
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.01.2019; Springer Nature B.V
• Subjects: Analytical Chemistry; Calcium vanadates; Chemistry; Chemistry and Materials Science; Differential scanning calorimetry; Electrical properties; Electrical resistivity; High temperature; Humidity; Inorganic Chemistry; Measurement Science and Instrumentation; Physical Chemistry; Polymer Sciences; Temperature dependence; Transport properties; Thermal expansion; Non-stoichiometric garnet; Electrical conductivity; DSC
• ISSN: 1388-6150; 1588-2926
• DOI: 10.1007/s10973-018-7780-z

Calcium vanadates Ca 5 Mg 4−x Zn x (VO 4 ) 6 (0 ≤  x  ≤ 4) have been studied for the first time using a set of high-temperature methods of analysis. The onset of melting process determined from differential scanning calorimetry decreases from 1158 to 881 °C (± 1.5 °C) with increasing of x (dopant’s content). CTE temperature dependence is found to show a hysteresis. Electrical transport properties measured by impedance spectroscopy in air of different humidity are also discussed. The value of electrical conductivity does not depend on air humidity. It is found to equal to 1.5 × 10 −6 S cm −1 at 720 °C for Ca 5 Mg 4 (VO 4 ) 6 which is specific for garnet-related crystals.