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公开(公告)号：DE3132681A1
公开(公告)日：1983-03-17
申请号：DE3132681
申请日：1981-08-19
Applicant: BASF AG
Inventor： HIBST HARTMUT DIPL CHEM DR
Abstract: The invention relates to a process for preparing finely particulate hexagonal Me2Y ferrites of the general formula M2Me2Fe12O22, in which M is barium, strontium, calcium and/or lead, and Me is divalent manganese, copper, iron, cobalt, nickel, zinc, magnesium and/or equimolar amounts of lithium and trivalent iron, by mixing an M chloride or carbonate, an Me chloride or carbonate and iron(III) chloride together with sodium carbonate and/or potassium carbonate, heating the mixture obtained to a temperature of from 800 to 1050 DEG C, and then isolating the platelet-shaped (bladed) hexagonal Me2Y ferrite formed in the process by leaching with water from the sodium chloride and/or potassium chloride melt formed.
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公开(公告)号：DE3132683A1
公开(公告)日：1983-03-17
申请号：DE3132683
申请日：1981-08-19
Applicant: BASF AG
Inventor： HIBST HARTMUT DIPL CHEM DR
Abstract: The invention relates to a process for preparing isotropic ferrite powders having a spinel structure of the general formula MeFe2O4, in which Me = aMn + bNi + cZn + dCo + eFe(II), the atomic mass ratios a, b, c, d and e each being from 0 to 1 and their sum being equal to 1, by mixing one or more Me salts, iron(III) chloride with alkali metal carbonate, heating the mixture obtained to a temperature of from 800 DEG C to 1200 DEG C and isolating the isotropic ferrite formed in the process by leaching with water.
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公开(公告)号：DE3132684A1
公开(公告)日：1983-03-17
申请号：DE3132684
申请日：1981-08-19
Applicant: BASF AG
Inventor： HIBST HARTMUT DIPL CHEM DR
Abstract: The invention relates to a process for preparing isotropic ferrite powders having a spinel structure of the general formula MeFe2O4, in which Me = aMn + bNi + cZn + dCo + eFe(II), the atomic mass ratios a, b, c, d and e each being from 0 to 1 and their sum being equal to 1, by reacting an aqueous solution or suspension of one or more of the Me salts and an aqueous iron(III) chloride solution with an aqueous solution of sodium carbonate and/or potassium carbonate, drying the resulting mixture which consists of sparingly soluble MeCO3 and iron(III) carbonate in an alkali metal chloride solution, and then heating the salt mixture to a temperature above the melting point of the alkali metal chloride but not above 1200 DEG C, and isolating the octahedral ferrite of the composition MeFe2O4, which forms in the process, by leaching with water.
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Patent Agency Ranking
公开(公告)号：DE3132678A1
公开(公告)日：1983-03-17
申请号：DE3132678
申请日：1981-08-19
Applicant: BASF AG
Inventor： HIBST HARTMUT DIPL CHEM DR
Abstract: The invention relates to a process for preparing finely particulate hexagonal ferrites of the general formula M(MeTi)xFe12-2xO19, in which M is barium or strontium, Me is zinc, nickel and/or cobalt, and x has values from 0 to 2.0, by mixing a barium or strontium salt, iron(III) chloride and optionally a salt of zinc, nickel and/or cobalt and a titanium compound, together with sodium carbonate and/or potassium carbonate, heating the mixture obtained to a temperature of from 700 to 1100 DEG C, and then isolating the hexagonal ferrite formed in the process by leaching with water, and to the use of said ferrites for the manufacture of magnetic recording media.
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公开(公告)号：DE3213683A1
公开(公告)日：1983-10-27
申请号：DE3213683
申请日：1982-04-14
Applicant: BASF AG
Inventor： HIBST HARTMUT DIPL CHEM DR
Abstract: M-Type ferrites of the formula AFe12O19, Me2Y-type ferrites of the formula A2Me2Fe12O22 or spinel-type ferrites of the formula MeFe2O4, where A is Ba, Sr, Pb and/or Ca and Me is Zn, Mn, Co, Cu, Fe(II) and/or 1/2(Li(I)+Fe(III)), are prepared by a process wherein iron(II) sulfate hydrate is dehydrated and oxidized and then mixed with sodium carbonate and/or potassium carbonate and salts and/or oxides of other A and/or Me cations required in addition to Fe(III) for ferrite formation, the mixture is heated at from 700 DEG to 1,200 DEG C., and the resulting ferrite is isolated by leaching with water.
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公开(公告)号：DE3132680A1
公开(公告)日：1983-03-17
申请号：DE3132680
申请日：1981-08-19
Applicant: BASF AG
Inventor： HIBST HARTMUT DIPL CHEM DR
Abstract: The invention relates to a process for preparing finely particulate hexagonal Me2Y ferrites of the general formula M2Me2Fe12O22, in which M is barium, strontium, calcium and/or lead, and Me is divalent manganese, copper, iron, cobalt, nickel, zinc, magnesium and/or equimolar amounts of lithium and trivalent iron, by reacting an aqueous solution or suspension of an M salt, an aqueous solution or suspension of an Me salt and an aqueous solution of an iron(III) salt with an aqueous sodium carbonate solution, drying the resulting mixed precipitate, heating the dry salt mixture to a temperature of from 800 DEG C to 1050 DEG C, and then isolating the platelet-shaped (bladed) Me2Y ferrite formed in the process from the Me2Y ferrite/sodium salt mixture by leaching with water.
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公开(公告)号：DE3143046A1
公开(公告)日：1983-05-05
申请号：DE3143046
申请日：1981-10-30
Applicant: BASF AG
Inventor： HIBST HARTMUT DIPL CHEM DR
Abstract: The invention relates to a finely divided barium ferrite of the formula BaFe6O10, to its preparation under hydrothermal process conditions and to its use as colour pigment.
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