Method of making MnZn ferrites

US4246128A · kind A · utility

Assignee

• Bell Telephone Laboratories, Inc. · US

Inventors

• Patrick K. Gallagher · Berkeley Heights, US
• Ernst M. Gyorgy · Madison, US
• David W. Johnson, Jr. · Bedminster, US
• Murray Robbins · Berkeley Heights, US

Key dates

• Filing date: Aug 8, 1979
• Grant date: Jan 20, 1981
• Expiry date: Aug 8, 1999

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B35/2658
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Desirable properties of manganese zinc ferrites are obtained without the need for controlling or changing the oxygen partial pressure during the sintering and cooling steps by adding a small amount of germanium or gallium to the ferrite and using an atmosphere, such as air, during the sintering and cooling steps, that has at least 1 percent oxygen by volume.