Accession Number : AD0277641

Title :   RESEARCH AND DEVELOPMENT OF YTTRIUM IRON GARNET SINGLE CRYSTALS

Corporate Author : TEXAS INSTRUMENTS INC DALLAS

Report Date : 30 MAY 1962

Pagination or Media Count : 1

Abstract : Yttrium iron garnet (YIG) single crystals 1/4 to 3/8 in. diameter with a dielectric constant of about 10 and 0.002 dissipation factor were produced by the floating zone techni ue. Ferrimagnetic r sonance line-widths of less than 2 oersteds were obtained from polished test spheres. Crack formation remains a major problem in growing YIG crystals by the floating zone technique. The occasional appearance of a mixture of YIG and iron oxide crystals as a second phase inclusion in YIG was related to zone temperature fluctuations. It is postulated that this second phase formation can be prevented by better temperature control and decreased zoning rate (0.10 in./hr.). Increasing the availability of active oxygen is discussed as a possible method of decreasing the divalent iron concentration in YIG. This action would favorably influence line-width. (Author)

Descriptors :   DIELECTRIC PROPERTIES, GROWTH(PHYSIOLOGY), IRON COMPOUNDS, MAGNETIC PROPERTIES, OXIDES, YTTRIUM COMPOUNDS, ZONE MELTING

Distribution Statement : APPROVED FOR PUBLIC RELEASE