Accession Number : AD0627149

Title :   CZOCHRALSKI GROWTH OF LAALO3.

Descriptive Note : Semi-annual rept. 1 Jul-31 Dec 65,

Corporate Author : LINDE DIV UNION CARBIDE CORP INDIANAPOLIS IND

Personal Author(s) : Brandle,C. D. ; Dess,H. M. ; Charvat,F. R.

Report Date : 31 JAN 1966

Pagination or Media Count : 18

Abstract : A new growth chamber was built to provide the capacity for growing boules capable of yielding 1/4-inch diameter by 3-inch length rods of Cr(3+) doped LaAlO3. Using this growth chamber, a seed rod of the correct orientation (111) was developed. Crystals containing Ca(2+) or Si(4+) were also grown to confirm the belief that they are the color center producing agents. As a result of these tests, additional color center producing agents were found, La(3+) lattice vacancies, and by proper annealing, these can be eliminated. Detwinning studies demonstrated the optimum direction to be the (111) direction of the pseudo-cube. Detwinning equipment was built which allows rods of either 1/8 or 1/4-inch diameter and up to 3-inches in length to be detwinned. (Author)

Descriptors :   (*LANTHANUM COMPOUNDS, ALUMINATES), (*ALUMINATES, CRYSTAL GROWTH), (*CRYSTAL GROWTH, LANTHANUM COMPOUNDS), (*LASERS, MATERIALS), LABORATORY EQUIPMENT, IMPURITIES, DOPING, CHROMIUM, CALCIUM, SILICON, CRYSTAL STRUCTURE, COLOR CENTERS, ANNEALING, TWINNING(CRYSTALLOGRAPHY)

Subject Categories : Lasers and Masers
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE