Accession Number : AD0666401

Title :   IMPROVED II-VI CRYSTALS.

Descriptive Note : Quarterly progress rept. no. 2, 8 Jun-7 Sep 65,

Corporate Author : CLEVITE CORP CLEVELAND OHIO ELECTRONIC RESEARCH DIV

Personal Author(s) : Shiozawa,L. R. ; Jost,J. M.

Report Date : 15 DEC 1965

Pagination or Media Count : 42

Abstract : Outgassing studies made on CdS powder, the original source material for crystal growth, indicated that gases evolved during sintering result chiefly from phase changes and chemical reactions of impurities. Continued re-examination of the standard sintering process for purifying CdS source material resulted in small but important improvements, such as lowering the sublimation rate to reduce contamination by 'carry-over' and increasing the maximum temperature to improve outgassing. A study of the present crystal growth methods shows that seed growth under argon at an acceptable low growth rate seems to hold the best promise for higher-quality crystals. A preliminary evaluation of CdS crystals by thermally-stimulated current measurements revealed a relatively simple curve with only two substantial peaks. Optical evaluation of CdS crystals continued by examination for strain and dislocations. The relationship of photosensitivity of CdS, important for sound amplifiers, and sulfur-vapor treatment has been explained, subject to further verification. Measurements of the electro-optic effect in ZnTe were made, and it is recommended for consideration for optical modulators.

Descriptors :   (*SEMICONDUCTORS, CRYSTAL GROWTH), (*CADMIUM SULFIDES, PREPARATION), POWDERS, SINTERING, DEGASIFICATION, SUBLIMATION, ELECTRICAL PROPERTIES, PHOTOCONDUCTIVITY, THERMOELECTRICITY, BIREFRINGENCE, CRYSTAL DEFECTS, ZINC COMPOUNDS, TELLURIDES, OPTICAL PROPERTIES, ACOUSTIC PROPERTIES

Subject Categories : Electrical and Electronic Equipment
      Crystallography
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE