On the low-temperature behavior of the critical specific heat capacity of an anharmonic crystal with long-range interaction

2016 ◽  
Author(s):  
Ekaterina S. Pisanova ◽  
Angel Y. Krushkov
Keyword(s):  
Heat Capacity ◽  
Low Temperature ◽  
Specific Heat ◽  
Long Range ◽  
Specific Heat Capacity ◽  
Temperature Behavior ◽  
Range Interaction ◽  
Anharmonic Crystal ◽  
Long Range Interaction

Phase transformation and Raman spectra in BaTiO3 nanocrystals

2002 ◽  
Vol 718 ◽  
Author(s):  
Jian Yu ◽  
X. J. Meng ◽  
J.L. Sun ◽  
G.S. Wang ◽  
J.H. Chu
Keyword(s):  
Particle Size ◽  
Phase Transformation ◽  
Low Temperature ◽  
Long Range ◽  
Lattice Expansion ◽  
Inversion Symmetry ◽  
Range Interaction ◽  
Cooperative Phenomena ◽  
Long Range Interaction ◽  
Hydrothermal Methods

AbstractIn this paper, size-induced ferroelectricit yweakening, phase transformation, and anomalous lattice expansion are observed in nanocrystalline BaTiO3 (nc-BaTiO3) deriv ed b y low temperature hydrothermal methods, and they are w ellunderstood using the terms of the long-range interaction and its cooperative phenomena altered by particle size in covalen t ionic nanocrystals. In cubic nc-BaTiO3, five modes centerd at 186, 254, 308, 512 and 716 cm-1 are observed Raman active in cubic nanophase, and they are attributed to local rhombohedral distortion breaking inversion-symmetry in cubic nanophase. The254 and 308 cm-1 modes are significantly affected not only by the concentration of hydroxyl defects, but also their particular configuration. And the 806 cm-1 modes found to be closely associated with OH - absorbed on grain boundaries.

Low-temperature specific heat capacity measurements and application to Mars thermal modeling

Icarus ◽  
2019 ◽  
Vol 321 ◽  
pp. 824-840 ◽  
Author(s):  
Tuan H. Vu ◽  
Sylvain Piqueux ◽  
Mathieu Choukroun ◽  
Christopher S. Edwards ◽  
Philip R. Christensen ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Low Temperature ◽  
Specific Heat ◽  
Specific Heat Capacity ◽  
Thermal Modeling ◽  
Low Temperature Specific Heat ◽  
Heat Capacity Measurements
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