Heat capacity at constant pressure and thermodynamic properties of phase transitions in PbMO3 (M=Ti, Zr and Hf)

Autor:	Yoshihiro Kuroiwa, Tooru Atake, Takeo Tojo, Yosuke Moriya, Takahiro Yoshida, Hitoshi Kawaji
Rok vydání:	2009
Předmět:	Phase transition Differential scanning calorimetry Chemistry Constant pressure Inorganic chemistry Analytical chemistry Physical and Theoretical Chemistry Condensed Matter Physics Heat capacity
Zdroj:	Journal of Thermal Analysis and Calorimetry. 95:675-683
ISSN:	1572-8943 1388-6150
DOI:	10.1007/s10973-008-9220-y
Popis:	The heat capacity of PbMO3 (M=Ti, Zr and Hf) at constant pressure was measured using a differential scanning calorimeter (DSC) from room temperature up to 870 K. Large anomalies were found in the heat capacity curves, corresponding to the ferroelectricparaelectric phase transition in PbTiO3 (PT), the antiferroelectric-paraelectric phase transitions in PbZrO3 (PZ) and PbHfO3 (PH). The transition entropies were estimated as 7.3 J K−1 mol−1 (PT), 9.9 J K−1 mol−1 (PZ) and 9.3 J K−1 mol−1 (PH). These values of transition entropies are much larger than that of a typical displacive-type phase transition.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::71a02258e55f7c698bb65523eb86e00f https://doi.org/10.1007/s10973-008-9220-y Zobrazit plný text záznamu Plný text ve formátu PDF