PHASE-TRANSITIONS AND THE HEAT-CAPACITY ANOMALIES IN FERROELECTRIC LI2GE7O15 AND LINAGE4O9

Authors
MORIKAWA K ATAKE T WADA M YAMAGUCHI T
Citation
K. Morikawa et al., PHASE-TRANSITIONS AND THE HEAT-CAPACITY ANOMALIES IN FERROELECTRIC LI2GE7O15 AND LINAGE4O9, Journal of the Physical Society of Japan, 67(6), 1998, pp. 1994-1998
Citations number
13
Categorie Soggetti
Physics
Journal title
Journal of the Physical Society of Japan → ACNP
ISSN journal
00319015
Volume
67
Issue
6
Year of publication
1998
Pages
1994 - 1998
Database
ISI
SICI code
0031-9015(1998)67:6<1994:PATHAI>2.0.ZU;2-R
Abstract
The heat capacity of Li2Ge7O15 and LiNaGe4O9 was measured by adiabatic calorimetry between 13 and 300K. A typical second-order type of anoma ly due to the ferroelectric phase transition was observed at 282.4K fo r Li2Ge7O15 and at 121.6K for LiNaGe4O9, and the entropy of transition was determined as 1.50 and 1.95 JK(-1)mol(-1), respectively. Smoothed heat capacity values at selected temperatures and some other thermody namic functions such as enthalpy, entropy and Gibbs energy were calcul ated from the experimental data and tabulated in a table.