DEVELOPMENT AND EVALUATION OF A HIGH TEMPERATURE DIELECTRIC MATERIAL FOR CAPACITORS
Abstract
Life testing of ceramic disks of (Ba.97La.02)ZrO3, Ba.99(Zr.98Nb.02)O3 and La(Al.96Si.03)O3 at 350 C for 1000 hr was terminated. During this period a field of 60 v-dc/mil was applied continuously. Of these materials the (Ba.97La.02)ZrO3 disks stood the test successfully. The final values for individual disks were between 10 to the 9th power and 10 to the 11th power ohm-m for volume resistivity and between 2 and 90 megohm-microfarad for (RC)-products. The other materials failed by puncture, rupture or excessive drop of volume resistivity. The electrical properties of ceramics of (Ba.94La.04)ZrO3 and (Ba.91La.06)ZrO3 were determined from 250 to 500 C. The dielectric constants are about 38 at 250 C and diminish to about 36 at 500 C. The volume resistivity values are of the order of 10 to the 11th power at 250 C and 10 to the 7th power at 500 C. The dielectric quality factor at 250 degrees is nearly 2000 for (Ba.94La.04)ZrO3 and almost 1000 for (Ba.91La.06)ZrO3. The corresponding values at 500 C are close to 150 for both. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 26, 1960
- Accession Number
- AD0258411
Entities
People
- John Koenig