Heat capacity and structure of Rb2KMeO3F3 (Me: Mo, W) elpasolites

Heat capacity and structure of Rb2KMeO3F3 (Me: Mo, W) elpasolites

X-ray and heat capacity measurements were performed on Rb2KMoO3F3 and Rb2KWO3F3 single crystals. A significant difference in the thermal parameters of atoms in 4a and 8c sites of Fm-3m structure was found, which depended on the central atom. Calorimetric measurements have revealed the heat capacity...

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Veröffentlicht in:Solid state sciences 2012-01, Vol.14 (1), p.166-170
Hauptverfasser: Kartashev, Andrey V., Molokeev, Maxim S., Isaenko, Lyudmila I., Zhurkov, Sergey A., Fokina, Valentina D., Gorev, Michail V., Flerov, Igor N.
Format: Artikel
Sprache:eng
Schlagworte:
Atomic structure
Calorimetry
Entropy
Heat capacity
Oxyfluorides
Specific heat
X-rays
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Zusammenfassung:X-ray and heat capacity measurements were performed on Rb2KMoO3F3 and Rb2KWO3F3 single crystals. A significant difference in the thermal parameters of atoms in 4a and 8c sites of Fm-3m structure was found, which depended on the central atom. Calorimetric measurements have revealed the heat capacity anomalies at 195 and 67 K, respectively, in Rb2KMoO3F3 and Rb2KWO3F3. The standard molar enthalpy and entropy were determined. Entropy changes associated with phase transitions in oxyfluorides under study and related Rb2KTiOF5 are discussed.
ISSN:1293-2558
DOI:10.1016/j.solidstatesciences.2011.11.019