Accession Number : AD0832209

Title :   GROWTH OF RARE EARTH OXIDE, GARNET AND ALUMINATE SINGLE CRYSTALS BY A HOLLOW CATHODE FLOAT-ZONE PROCESS.

Descriptive Note : Technical management rept. 15 Oct 67-15 Mar 68,

Corporate Author : MATERIALS RESEARCH CORP ORANGEBURG NY

Personal Author(s) : Class, Walter

Report Date : APR 1968

Pagination or Media Count : 31

Abstract : The work reported herein relates to the preparation of yttrium aluminum garnet, yttrium aluminate and several C-type rare earth oxides by a hollow cathode float-zone method. The problems associated with the growth of good yttrium aluminum garnet crystals have been solved. In addition, several such crystals of good optical perfection were prepared. The growth of yttrium aluminate crystals and erbium oxide crystals was also investigated. Crystal cracking of the erbium oxide is still a major problem, and the incongruency and metastability of the yttrium aluminate has resulted in limiting the length of crystal boule which can be grown. The use of low density feed rods is being investigated to eliminate cracking of the erbia, and the growth of neodymium doped yttrium aluminate is planned as the larger neodymium ion size may act to stabilize the aluminate structure. (Author)

Descriptors :   *CRYSTAL GROWTH), (*LASERS, GARNET, IRON COMPOUNDS, YTTRIUM COMPOUNDS, ALUMINATES, RARE EARTH ELEMENTS, ERBIUM COMPOUNDS, OXIDES, INSTRUMENTATION, PROCESSING.

Subject Categories : Lasers and Masers
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE