STUDY OF THERMAL AND MECHANICAL PROPERTIES OF SELECTED SOLIDS FROM 4 DEGREES TO THE MELTING POINT.
Abstract
The theory of thermal expansion is briefly reviewed with special emphasis on the negative low temperature expansion frequently found in the diamond and sphalerite crystal structures. Lattice parameters of the rock salt compounds AgCl, AgBr and MgO, and the sphalerite compounds CuCl, CuBr, CuI, AgI, BN, BP, SiC, and CdTe measured from 4.2K to 300K are presented. The rock salt compounds are found to behave normally, i.e., positive throughout the temperature range. CuCl, CuBr, AgI, CdTe, and probably BN and BP possess a region of low temperature negative expansion. Within the limits of experimental error, CuI and SiC do not. The thermal expansion of AgI is found to be dependent on its preparation; this has been attributed to the presence of stacking faults. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 15, 1969
- Accession Number
- AD0699579
Entities
People
- Herbert F. Schaake
Organizations
- Martin Marietta