Accession Number : AD0644604

Title :   LOW MAGNETIC SATURATION GARNETS.

Descriptive Note : Quarterly progress rept. no. 6, 1 May-31 Jul 66,

Corporate Author : SPERRY MICROWAVE ELECTRONICS CO CLEARWATER FLA

Personal Author(s) : Hodges,L. R. ; Wilson,W. R. ; Rodrigue,C. P. ; Harrison,G. P.

Report Date : DEC 1966

Pagination or Media Count : 54

Abstract : Ten single crystal runs consisting of YCaVIG, BiCaVIG, YBiCaVIG and BiCaV(Al)IG were prepared and evaluated. Good quality crystals were grown in each of the four above garnet series. The temperature dependence of the first and second order magnetocrystalline anisotropy constants, and therefore the effective anisotropy field, of three different BiCaVIG compositions have been measured. The anisotropy field for these materials decreases linearly with increasing temperature ( - 180 to + 25C). Polycrystalline samples of Y1.6Ca1.4V0.7AlwFe4.3-wO12 were prepared for w = 0 to 0.5. Lattice constant, theoretical density, linewidth and magnetization for this series of compositions are reported. The temperature characteristics of the microwave properties for the Bi3-2yCa2yVyFe5-yO12 family are reported for y = 1.1 to 1.4. A discussion of the discrepancy between the polycrystalline and single crystal magnetization measured on ostensibly the same composition is presented. Several possible explanations are presented, however, the problem remains unresolved. Bi0.4Ca2.6V1.3Fe3.7O12 single crystal and polycrystalline samples have been evaluated in an S-band Y-junction circulator. Operating characteristics are reported for 25C and 77K. (Author)

Descriptors :   (*FERROMAGNETIC MATERIALS, *GARNET), SUBSTITUTES, VANADIUM COMPOUNDS, BISMUTH COMPOUNDS, CALCIUM COMPOUNDS, SINGLE CRYSTALS, CRYSTALS, CRYSTAL GROWTH, MICROWAVES, ALUMINUM COMPOUNDS, IRON COMPOUNDS, OXIDES, MAGNETIC PROPERTIES, TEMPERATURE, ANISOTROPY

Subject Categories : Miscellaneous Materials
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE