Accession Number:

AD0263638

Title:

RESEARCH AND DEVELOPMENT OF YTTRIUM IRON GARNET SINGLE CRYSTALS

Descriptive Note:

Corporate Author:

TEXAS INSTRUMENTS INC DALLAS

Personal Author(s):

Report Date:

1961-09-13

Pagination or Media Count:

1.0

Abstract:

Yttrium iron garnet YIG single crystals 14 to 38 in. diameter with about 10 dielectric constant and 0.002 dissipation have been produced by the floating zone technique. Ferrimagnetic resonance line widths of 1 to 2 oersteds were obtained from polished test spheres. Successful experiments with Ga, Gd, and Sm-substituted YIG demonstrated the feasibility of the same technique for growing Ga or rare earth-substituted garnets. Experiments with YIG indicate that the floating zone technique can be modified to use oxygen pressure to 25 atmospheres, automatic control of temperature and zoning rate, and an effective growth rate of at least 0.20 in.hr. Thermal cracking is still a major problem, but YIG crystals 12-in. diam by 1-in. long can be produced by improved techniques. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE