PROCESS FOR THE PREPARATION OF FINELY DIVIDED FERRITE POWDER

    公开(公告)号:DE3273566D1

    公开(公告)日:1986-11-06

    申请号:DE3273566

    申请日:1982-07-16

    Applicant: BASF AG

    Abstract: A process for the preparation of finely divided ferrites of the general formula MeFe2O4(I) where Me=aMn+bNi+cZn+dCo+eFe(II), and the atomic weight ratios a, b, c, d and e are each from 0 to 1 and their sum is 1, or M21Me21Fe12O22(II) where M1 is barium, strontium, calcium and/or lead, and Me1 is divalent manganese, copper, iron, cobalt, nickel, zinc, magnesium and/or equimolar amounts of lithium and trivalent iron, or M2(Me2Ti)xFe12-2xO19(III) where M2 is barium or strontium, Me2 is zinc, nickel and/or cobalt and x is from 0 to 1.5, wherein the aqueous solutions of the salts required for the particular composition are reacted with an aqueous solution of sodium carbonate and/or potassium carbonate, the water is removed, the dry salt mixture is heated at from 800 DEG to 1200 DEG C., and the resulting finely divided ferrite of the predetermined composition is isolated by leaching with water.

    60.
    发明专利
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    公开(公告)号:DE59505873D1

    公开(公告)日:1999-06-17

    申请号:DE59505873

    申请日:1995-02-09

    Applicant: BASF AG

    Abstract: Multimetal oxide compsn. of formula (I) is new: (A)p(B)q(I): A = Mo12X aX bX cX dSeX fO x; B = X 12CugX hOy; X = P, As, B, Ge and/or Si; X = V, Nb and/or W; X = H, up to 97 mole-% of which may be replaced by K, Rb, Cs and/or NH4; X = Sb and/or Bi; X = Re and/or Rh; X = Mp, W, Nb and/or Ta; X = Li, Na, K, Rb, Cs and/or NH4; a = 1-6; b, d = 0-6; c = 3-5; e, f = 0-3; g = 4-24; h = 0-20; x, y = values depending on the valency and content of elements other than O; p, q = values other than O, with the ratio p/q = 12:0.1 to 12:48. The A and B fractions are each in the form of 3D zones, which differ in chemical compsn. from their local surroundings, and the relative distribution of the A and B zones is as in a mixt. of finely-divided A and finely-divided B.

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