Accession Number : AD0699579

Title :   STUDY OF THERMAL AND MECHANICAL PROPERTIES OF SELECTED SOLIDS FROM 4 DEGREES TO THE MELTING POINT.

Descriptive Note : Final rept. Nov 65-Oct 69,

Corporate Author : MARTIN MARIETTA CORP ORLANDO FLA ORLANDO DIV

Personal Author(s) : Schaake,Herbert F.

Report Date : 15 NOV 1969

Pagination or Media Count : 55

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)

Descriptors :   (*CRYSTAL LATTICES, *THERMAL EXPANSION), CRYSTAL STRUCTURE, DIAMONDS, HALIDES, COPPER COMPOUNDS, SILVER COMPOUNDS, BORON COMPOUNDS, SILICON COMPOUNDS, CARBIDES, NITRIDES, PHOSPHIDES

Subject Categories : Crystallography
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE