Accession Number : AD0700413

Title :   VERNEUIL GROWTH EXPERIMENTS WITH MAGNESIUM OXIDE CRYSTALS.

Descriptive Note : Final scientific rept. 20 Sep 65-31 Oct 69,

Corporate Author : MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : Early,Harold C. ; Martin,Frank J. ; Martin,Edward A.

Report Date : OCT 1969

Pagination or Media Count : 33

Abstract : A plasma torch having very high gas enthalpy and low contamination was developed for growing single crystals of very refractory materials. The torch consisted of a wall-stabilized, constricted-arc, nitrogen-plasma jet using 20-50 kilowatts of d-c power. A flow of purge gas prevented the vaporized tungsten electrode material from contaminating the plasma stream. The crystal-growing experiments used a muffle of sintered magnesium oxide and a Verneuil feed system. MgO seed crystals could be made to grow a few millimeters in height in several minutes' time when the conditions were just right. (Author)

Descriptors :   (*MAGNESIUM OXIDES, SINGLE CRYSTALS), (*SINGLE CRYSTALS, CRYSTAL GROWTH), HIGH TEMPERATURE, PLASMA MEDIUM, FEASIBILITY STUDIES

Subject Categories : Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE