scholarly journals Heat Capacities and Thermodynamic Properties of Ammonium Nitrate Crystal: Phase Transitions between Stable and Metastable Phases

1967 ◽  
Vol 40 (8) ◽  
pp. 1833-1844 ◽  
Author(s):  
Masanori Nagatani ◽  
Tetsuro Seiyama ◽  
Minoru Sakiyama ◽  
Hiroshi Suga ◽  
Syûzô Seki
Keyword(s):  
Phase Transitions ◽  
Thermodynamic Properties ◽  
Ammonium Nitrate ◽  
Heat Capacities ◽  
Metastable Phases ◽  
Crystal Phase ◽  
Stable And Metastable Phases

Heat Capacities of Rb2ZnBr4 between 3 and 300 K–Thermodynamic Properties of Its Incommensurate Phase Transitions

1983 ◽  
Vol 52 (10) ◽  
pp. 3475-3485 ◽  
Author(s):  
Katsuhiko Nomoto ◽  
Tooru Atake ◽  
Bijay Krishna Chaudhuri ◽  
Hedeaki Chihara
Keyword(s):  
Phase Transitions ◽  
Thermodynamic Properties ◽  
Heat Capacities ◽  
Incommensurate Phase

scholarly journals Heat Capacities and Thermodynamic Properties of Pinnoite and Inderite

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Hanyu Zheng ◽  
Kangrui Sun ◽  
Long Li ◽  
Yafei Guo ◽  
Tianlong Deng
Keyword(s):  
Free Energy ◽  
Phase Transitions ◽  
Thermodynamic Properties ◽  
Gibbs Free Energy ◽  
Thermodynamic Functions ◽  
High Purity ◽  
Heat Capacities ◽  
Thermal Anomalies ◽  
Natural Minerals ◽  
First Time

In this paper, in order to understand the thermodynamic properties of natural minerals of pinnoite (MgB2O4·3H2O, Pin) and inderite (Mg2B6O11·15H2O, Ind) deposited in salt lakes, heat capacities of two minerals were measured using a precision calorimeter at temperatures from 306.15 to 355.15 K after the high purity was synthesized. It was found that there are no phase transitions and thermal anomalies for the two minerals, and the molar heat capacities against temperature for Pin and Ind were fitted as Cp,m,pin = −2029.47058 + 16.94666T − 0.04396T2 + 3.89409×10−5T3 and Cp,m,Ind = −30814.43795 + 282.68108T − 0.85605T2 + 8.70708×10−4T 3, respectively. On the basis of molar heat capacities (Cp,m) of Pin and Ind, the thermodynamic functions of entropy, enthalpy, and Gibbs free energy at the temperature of 1 K interval for the two minerals were obtained for the first time.

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