LITHIUM-ZINC FERRITE COMPOSITION WITH ARSENIC OXIDE OR BISMUTH OXIDE ADDITIVE

• US 3,640,867 A
• Filed: 05/07/1969
• Issued: 02/08/1972
• Est. Priority Date: 05/10/1968
• Status: Expired due to Term

• Current Assignee: Masayuki Emoto, Susumu Kurokawa, Tsutomu Iimura
• Original Assignee: Masayuki Emoto, Susumu Kurokawa, Tsutomu Iimura
• Inventors: Iimura, Tsutomu, Kurokawa, Susumu, Emoto, Masayuki
• Primary Examiner(s): Edmonds, Robert D.
• Application Number:
  US04/822,366
• Time in Patent Office: 1,007 Days
• Field of Search: 252/62.61,62.62
• US Class Current: 252/62.61
• CPC Class Codes: C04B 35/2616 containing lithium

Abstract

A lithium-zinc ferrite composition most suitable for use as magnetic memory cores in high-speed electronic computer, which consists of 10 to 30 mol percent of Li20, 3.5 to 20 mol percent of Zn0 and 70 to 85 mol percent of Fe203 as the main components; and in addition at least one metal oxide selected from the group consisting of vanadium oxide, arsenic oxide and bismuth oxide as subcomponents, the content of the metal oxide being 0.01 to 1 percent by weight with respect to the main components.

Claims

2. A lithium-zinc ferrite composition claimed in claim 1, in which the metal oxide content is 0.06 to 0.5 weight percent.

3. grinding the prefired product,

4. A method for producing lithium-zinc ferrite composition comprising the steps of

5. A method for producing lithium-zinc ferrite composition claimed in claim 4, in which said member is present in an amount of 0.06 to 0.5 weight percent.

6. A method for producing a lithium-zinc ferrite composition according to claim 4 in which said member is present in an amount of about 0.1 weight percent.

7. A magnetic memory core which consists essentially of 10 to 30 mol percent of Li2O, 3.5 to 20 mol percent of ZnO and 70 to 85 mol percent of Fe2O3 as the main components;

and in addition at least one metal oxide selected from the group consisting of arsenic oxide and bismuth oxide as subcomponents, the content of the metal oxide being 0.01 to 1 weight percent with respect to the main components.

8. The magnetic memory core of claim 7 wherein the metal oxide content is 0.06 to 0.5 weight percent.