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Relationship Between Thermal Expansion and Crystal Chemical Parameters in Diborides

Published online by Cambridge University Press:  06 March 2019

H.A. McKinstry ,
Lai Daik Chai ,
R.V. Sara  and
K.E. Spear
H.A. McKinstry
Affiliation:
The Pennsylvania State University, University Park, PA 16802
Lai Daik Chai
Affiliation:
The Pennsylvania State University, University Park, PA 16802
R.V. Sara
Affiliation:
The Pennsylvania State University, University Park, PA 16802
K.E. Spear
Affiliation:
The Pennsylvania State University, University Park, PA 16802
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Thermal expansion is an interesting, ubiquitous and neglected property of materials. Recently, Lenain et al. (1985) and Limaye (1986) have been investigating anisotropy in the low-expansion structures of the sodium zirconium phosphate family. In the hexagonal structure one axis expands while another contracts. In going from the calcium to the strontium analog the anisotropy actually changes sign. A change in anisotropy between CrB2 and TiB2 had been observed by R.V. Sara (1960). The results in Fig. 1 obtained by high temperature x-ray diffraction measurements indicate that for TiB2 the thermal expansion of the c-axis is greater than the expansion of the a-axis, whereas for CrB2 the reverse is true.

Type
IX. High Temperature and Non-Ambient Powder Diffraction Applications
Information
Advances in X-Ray Analysis , Volume 30: Thirty-Fifth Annual Conference on Applications of X-ray Analysis, August 4-8, 1986 , 1986 , pp. 503 - 510
Copyright
Copyright © International Centre for Diffraction Data 1986

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References

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