Specific heat on Sr2Nb2O7 and Sr2Ta2O7
| Autor: | Tooru Atake, Hitoshi Kawaji, Yukikuni Akishige, Takeo Tojo, Hirotake Shigematsu |
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| Rok vydání: | 2005 |
| Předmět: | |
| Zdroj: | Journal of Thermal Analysis and Calorimetry. 81:537-540 |
| ISSN: | 1572-8943 1388-6150 |
| DOI: | 10.1007/s10973-005-0818-z |
| Popis: | Specific heats on the single crystals of Sr2Nb2O7, Sr2Ta2O7 and (Sr1-xBax)2Nb2O7 were measured in a wide temperature range of 2-600 K. Heat anomalies of a λ-type were observed at the incommensurate phase transition of TINC (=495 K) on Sr2Nb2O7 and at the super-lattice phase transition of TSL (=443 K) on Sr2Ta2O7; the transition enthalpies and the transition entropies were estimated. Furthermore, a small heat anomaly was observed at the low temperature ferroelectric phase transition of TLOW (=95 K) on Sr2Nb2O7. The transition temperature TLOW decreases with increasing Ba content x and it vanishes for samples of x>2%. |
| Databáze: | OpenAIRE |
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