Heat Capacity in α-β Phase Transition of Quartz

1985 ◽  
Vol 54 (2) ◽  
pp. 625-629 ◽  
Author(s):  
Masahide Matsuura ◽  
Haruhiko Yao ◽  
Kazutoshi Gouhara ◽  
Ichiro Hatta ◽  
Norio Kato
Keyword(s):  
Phase Transition ◽  
Heat Capacity ◽  
Β Phase

Heat capacity of NH4Cl1 − xBrx solid solutions in the vicinity of the γ-to-β phase transition

1984 ◽  
Vol 16 (8) ◽  
pp. 719-732 ◽  
Author(s):  
E.B. Amitin ◽  
O.A. Nabutovskaya ◽  
I.E. Paukov ◽  
K.S. Sukhovey
Keyword(s):  
Phase Transition ◽  
Heat Capacity ◽  
Solid Solutions ◽  
Β Phase

Critical Behaviour of the Heat Capacity Near the α-β Phase Transition in Quartz

2013 ◽  
Vol 32 (2) ◽  
pp. 189-194 ◽  
Author(s):  
H. Yurtseven ◽  
M. Desticioğlu
Keyword(s):  
Phase Transition ◽  
Heat Capacity ◽  
Critical Exponent ◽  
Power Law ◽  
Theoretical Models ◽  
Order Transition ◽  
Critical Behaviour ◽  
Experimental Heat ◽  
Β Phase ◽  
Second Order Transition

AbstractThe α-β transition (TQ = 578°C) is studied in quartz by analyzing the experimental heat capacity Cp data taken from the literature, using a power-law formula. Values of the critical exponent α for Cp are extracted below and above TQ, which describe the α-β transition as a second order transition in quartz. The α values obtained here are compared with the predictions of the theoretical models.

The thermodynamics of the divalent metal fluorides. I. Heat capacity of lead tetrafluorostannate, PbSnF4, from 10.3 to 352 K

1988 ◽  
Vol 66 (4) ◽  
pp. 549-552 ◽  
Author(s):  
Jane E. Callanan ◽  
Ron D. Weir ◽  
Edgar F. Westrum Jr.
Keyword(s):  
Phase Transition ◽  
Heat Capacity ◽  
Thermodynamic Functions ◽  
Adiabatic Calorimetry ◽  
Temperature Limit ◽  
Divalent Metal ◽  
Ion Conductor ◽  
Metal Fluorides ◽  
Fast Ion Conductor ◽  
Fast Ion

We have measured the heat capacity of the fast ion conductor PbSnF4 at 10.3 < T < 352 K by adiabatic calorimetry. Our results show anomalous values in the Cp,m in the region 300 < T < 352 K. These are associated with the α–β crystallographic transition reported at 353 K. Because the upper temperature limit of our cryostat is around 354 K, it was impossible to follow the phase transition to completion. A more subtle anomaly in the Cp,m was detected between 130 and 160 K. Standard molar thermodynamic functions are presented at selected temperatures from 5 to 350 K.

Heat capacity of PMN near an electric-field-induced phase transition

JETP Letters ◽  
2007 ◽  
Vol 85 (6) ◽  
pp. 283-285 ◽  
Author(s):  
M. V. Gorev ◽  
V. S. Bondarev ◽  
K. S. Aleksandrov
Keyword(s):  
Phase Transition ◽  
Heat Capacity ◽  
Electric Field

Site-occupation tendencies for ternary additions (Fe, Co, Ni) in β-phase transition-metal aluminides

1995 ◽  
Vol 51 (13) ◽  
pp. 8102-8106 ◽  
Author(s):  
Mahalingam Balasubramanian ◽  
Douglas M. Pease ◽  
Joseph I. Budnick ◽  
Tariq Manzur ◽  
Dale L. Brewe
Keyword(s):  
Phase Transition ◽  
Transition Metal ◽  
Site Occupation ◽  
Β Phase ◽  
Ternary Additions ◽  
Metal Aluminides

scholarly journals On the equipartition theorem and black holes non-Gaussian entropies

2020 ◽  
Vol 35 (32) ◽  
pp. 2050266 ◽  
Author(s):  
Everton M. C. Abreu ◽  
Jorge Ananias Neto ◽  
Edésio M. Barboza ◽  
Albert C. R. Mendes ◽  
Bráulio B. Soares
Keyword(s):  
Phase Transition ◽  
Black Holes ◽  
Heat Capacity ◽  
Algebraic Expression ◽  
Mathematical Form ◽  
Entropy Model ◽  
Standard Thermodynamic Functions ◽  
Mathematical Expressions ◽  
Equipartition Theorem ◽  
Non Gaussian

In this letter we have shown that, from the standard thermodynamic functions, the mathematical form of an equipartition theorem may be related to the algebraic expression of a particular entropy initially chosen to describe the black hole event horizon. Namely, we have different equipartition expressions for distinct statistics. To this end, four different mathematical expressions for the entropy have been selected to demonstrate our objective. Furthermore, a possible phase transition is observed in the heat capacity behavior of the Tsallis and Cirto entropy model.

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