Accession Number:

AD0258411

Title:

DEVELOPMENT AND EVALUATION OF A HIGH TEMPERATURE DIELECTRIC MATERIAL FOR CAPACITORS

Descriptive Note:

Corporate Author:

CLEVITE CORP CLEVELAND OHIO

Personal Author(s):

• KOENIG,JOHN

Report Date:

1960-10-26

Pagination or Media Count:

1.0

Abstract:

Life testing of ceramic disks of Ba.97La.02ZrO3, Ba.99Zr.98Nb.02O3 and LaAl.96Si.03O3 at 350 C for 1000 hr was terminated. During this period a field of 60 v-dcmil was applied continuously. Of these materials the Ba.97La.02ZrO3 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.04ZrO3 and Ba.91La.06ZrO3 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.04ZrO3 and almost 1000 for Ba.91La.06ZrO3. The corresponding values at 500 C are close to 150 for both. Author

Descriptors:

• *CERAMIC CAPACITORS
• *DIELECTRICS
• BARIUM COMPOUNDS
• CAPACITORS
• CERAMIC MATERIALS
• DIELECTRIC PROPERTIES
• ELECTRICAL PROPERTIES
• LANTHANUM COMPOUNDS
• MATERIALS
• MEASUREMENT
• OXIDES
• ZIRCONATES

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE