Thermal Expansion Study of Ordered and Disordered Fe3Al: An Effective Approach for the Determination of Vibrational Entropy

1996 ◽  
Vol 76 (11) ◽  
pp. 1876-1879 ◽  
Author(s):  
Goutam Dev Mukherjee ◽  
C. Bansal ◽  
Ashok Chatterjee
Keyword(s):  
Thermal Expansion ◽  
Vibrational Entropy ◽  
Thermal Expansion Study

A neutron powder diffraction determination of the thermal expansion tensor of crocoite (PbCrO4) between 60 K and 290 K

1996 ◽  
Vol 60 (403) ◽  
pp. 963-972 ◽  
Author(s):  
Kevin S. Knight
Keyword(s):  
Thermal Expansion ◽  
Temperature Dependence ◽  
Powder Diffraction ◽  
Maximum Expansion ◽  
Lattice Constants ◽  
Thermal Expansion Tensor ◽  
Diffraction Determination ◽  
Line Passing ◽  
Neutron Time

AbstractThe thermal expansion tensor of crocoite has been determined from high-resolution neutron time-of-flight powder diffraction data. The temperature dependence of the lattice constants between 4.5 K and 290 K have been fitted to a quasi-harmonic Einstein model, and the temperature dependence of the thermal expansion tensor has been calculated for 60 K ≤ T ≤ 290 K. The magnitudes of the principal expansivities and their orientation exhibit saturation behaviour for temperatures above 300 K. The predicted saturated expansion coefficients are α11 = 33.1(1) × 10−6K−1, α22 = 15.72(3) × 10−6K−1, α33 = 3.36(1) × 10−6K−1, with α22 parallel to b and α11 lying at an angle of −37.86(5)° to c for the P21/n setting of the crystal structure. The direction of maximum expansion is approximately parallel to both and the least-squares line passing through the projection of the chromium atoms on (010). The direction of minimum expansion lies approximately parallel to [101]. No evidence was found for either a structural or magnetic phase transition between 4.5 K and 300 K.

scholarly journals THERMAL EXPANSION STUDY OF A UVAROVITE RICH GARNET

2007 ◽  
Vol 21 (11) ◽  
pp. 1915-1922 ◽  
Author(s):  
G. PARTHASARTHY ◽  
R. SRINIVASAN ◽  
G. D. MUKHERJEE ◽  
C. BANSAL ◽  
ASHOK CHATTERJEE
Keyword(s):  
Thermal Expansion ◽  
Specific Heat ◽  
Thermodynamic Parameters ◽  
Semiclassical Model ◽  
Lattice Specific Heat ◽  
First Time ◽  
Thermal Expansion Study

Thermal expansion measurements have been performed on a uvarovite rich garnet sample for the first time and compared with the expansion data on grossular and pyrope-rich garnets reported in the literature. A semiclassical model has been used to analyze the data and to obtain various thermodynamic parameters. Using these parameters, the lattice specific heat and the corresponding entropy have also been calculated.

X-ray determination of the thermal expansion of calcium molybdate

1969 ◽  
Vol 30 (10) ◽  
pp. 2484-2486 ◽  
Author(s):  
V.T. Deshpande ◽  
S.V. Suryanarayana
Keyword(s):  
Thermal Expansion ◽  
X Ray ◽  
Calcium Molybdate

Determination of thermal-expansion characteristics of metals using strain gages

1978 ◽  
Vol 18 (4) ◽  
pp. 155-158 ◽  
Author(s):  
T. E. Finke ◽  
T. G. Heberling
Keyword(s):  
Thermal Expansion ◽  
Strain Gages
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