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Phase Transitions in LiNH 4 SO 4 below and above Room Temperature
Author(s) -
Diosa J.E.,
Aparicio G.M.,
Vargas R.A.,
Jurado J.F.
Publication year - 2000
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200007)220:1<651::aid-pssb651>3.0.co;2-t
Subject(s) - phase transition , differential scanning calorimetry , capacitance , materials science , phase (matter) , differential capacitance , thermal , condensed matter physics , thermodynamics , chemistry , physics , electrode , organic chemistry
The phase transitions in LiNH 4 SO 4 (LAS) were studied below and above room temperature by means of several techniques: modulated differential scanning calorimetry (MDSC), capacitance and ac thermal measurements. Our results show four distinct phases transitions at 460, 285, 225 and 28 K on cooling runs. The phase transitions at 460 and 285 K are of first order. The 225 K phase transitions is reported for the first time. The capacitance results show a strong hysteretic behavior in the 225 K transition on successive heating and cooling cycles attributed to the field effect on the polar ordering.