JPS5571631A - Production of cobalt-containing iron oxide magnetic powder - Google Patents

Production of cobalt-containing iron oxide magnetic powder

Info

Publication number
JPS5571631A
JPS5571631A JP14587978A JP14587978A JPS5571631A JP S5571631 A JPS5571631 A JP S5571631A JP 14587978 A JP14587978 A JP 14587978A JP 14587978 A JP14587978 A JP 14587978A JP S5571631 A JPS5571631 A JP S5571631A
Authority
JP
Japan
Prior art keywords
magnetic powder
iron oxide
cobalt
oxide magnetic
powder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP14587978A
Other languages
Japanese (ja)
Other versions
JPS6242860B2 (en
Inventor
Toshinobu Sueyoshi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maxell Holdings Ltd
Original Assignee
Hitachi Maxell Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Maxell Ltd filed Critical Hitachi Maxell Ltd
Priority to JP14587978A priority Critical patent/JPS5571631A/en
Publication of JPS5571631A publication Critical patent/JPS5571631A/en
Publication of JPS6242860B2 publication Critical patent/JPS6242860B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE: To obtain the title magnetic powder having a narrow coercive force distribution by using γ-Fe2O3 powder reduced under specified conditions in production of the title powder by treating a dispersion contg. iron oxide magnetic powder, a cobalt salt and an alkali.
CONSTITUTION: γ-Fe2O3 powder is dispersed in a high b.p. polyol such as (poly)alkylene glycol or glycerol and heated at about 150°CW the b.p. of the solvent to partially reduce the γ-Fe2O3, thus forming iron oxide magnetic powder whose oxidation state is between γ-Fe2O3 and Fe3O4. An aq. dispersion is then formed contg. the iron oxide magnetic powder wetted with the polyol, a cobalt salt such as cobalt chloride or cobalt sulfate, and an alkali such as sodium hydroxide or potassium hydroxide in an amt. of an equivalent or more to the salt. This dispersion is treated at a suitable temp. for an adequate time to obtain cobalt-contg. iron oxide magnetic powder.
COPYRIGHT: (C)1980,JPO&Japio
JP14587978A 1978-11-25 1978-11-25 Production of cobalt-containing iron oxide magnetic powder Granted JPS5571631A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14587978A JPS5571631A (en) 1978-11-25 1978-11-25 Production of cobalt-containing iron oxide magnetic powder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14587978A JPS5571631A (en) 1978-11-25 1978-11-25 Production of cobalt-containing iron oxide magnetic powder

Publications (2)

Publication Number Publication Date
JPS5571631A true JPS5571631A (en) 1980-05-29
JPS6242860B2 JPS6242860B2 (en) 1987-09-10

Family

ID=15395152

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14587978A Granted JPS5571631A (en) 1978-11-25 1978-11-25 Production of cobalt-containing iron oxide magnetic powder

Country Status (1)

Country Link
JP (1) JPS5571631A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014094838A (en) * 2012-11-07 2014-05-22 Univ Of Tsukuba Method of manufacturing strong magnetic iron oxide particles
JP2014169197A (en) * 2013-03-01 2014-09-18 Nippon Chem Ind Co Ltd Method of producing lithium sulfide and method of producing inorganic solid electrolyte

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014094838A (en) * 2012-11-07 2014-05-22 Univ Of Tsukuba Method of manufacturing strong magnetic iron oxide particles
JP2014169197A (en) * 2013-03-01 2014-09-18 Nippon Chem Ind Co Ltd Method of producing lithium sulfide and method of producing inorganic solid electrolyte

Also Published As

Publication number Publication date
JPS6242860B2 (en) 1987-09-10

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