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Quarterly progress rept. no. 7, 16 Mar15 June 63,
RAYTHEON CO WALTHAM MASS
Pagination or Media Count:
The enhanced nonlinearity of BST-50 1 SrSnO3-B has been the subject of continued investigation. The quality of the microstructure of various other stannate doped BST-50 materials does not correlate with the observed nonlinearity at all. Annealing of the high nonlinearity materials has been observed to decrease the nonlinearity by as much as a factor of two. It is not thought that the grain size is relevant to nonlinearity unless it is the presence of very small grains which is important. In this case the effect of annealing must presumably proceed by volatilization of the tin or by segregation in the material. The field dependent losses in single crystal SrTiO3 have been measured at 77 K. Various features of this experiment suggest previously unknown materials problems possibly connected with lack of homogeneity for short periods after application of a field. Author
APPROVED FOR PUBLIC RELEASE