MICROWAVE NONLINEAR DIELECTRIC MATERIALS
Abstract
Microwave nonlinearity and loss tangent data for alumina and stannate-doped (Ba0.5,Sr0.5)TiO3 (BST-50) near the Curie temperature are presented. A hot-pressed, annealed sample is included among the above materials. Similar data on alumina- and lanthana-doped (Ba0.7,Sr0.3)TiO3 (BST- 70), including a hot-pressed, annealed sample are presented. No unusual behavior was observed, and it is concluded that hot-pressing and annealing do little to improve the behavior of mixed titanate ceramics near the Curie temperature. A BaTiO3 ceramic doped with two mole percent of lanthana (La2O3) exhibited an extrapolated Curie temperature of +30C. Its nonlinearity and loss at the Curie peak were both comparable to those of BST-50 or BST-70. Lanthanum additions to SrTiO3 depressed the Curie temperature by an amount of 30-40C/mole percent lanthanum. The frequency dependence of the loss tangent of BST-50, BST- 70, and lanthana-doped BaTiO3 is seen to deviate strongly from linear dependence near the Curie temperature. The frequency ranges used were 2-4 Gc/ sec and 8-12 Gc/sec.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 14, 1964
- Accession Number
- AD0614274
Entities
People
- A. Paladino
- J. S. Waugh
- Matthew W. Harris
- P. B. Nutter
Organizations
- RTX