Preparation of ABO.sub.3 compounds from mixed metal aromatic coordination complexes

• US 4,946,810 A
• Filed: 09/11/1989
• Issued: 08/07/1990
• Est. Priority Date: 08/24/1987
• Status: Expired due to Fees

• Current Assignee: The Dow Chemical Company (Dow, Inc.)
• Original Assignee: The Dow Chemical Company (Dow, Inc.)
• Inventors: Heistand, Robert H. II, Duquette, Lawrence G.
• Primary Examiner(s): Dixon, Jr., William R.
• Assistant Examiner(s): MARCANTONI, PAUL D
• Application Number:
  US07/405,335
• Time in Patent Office: 330 Days
• Field of Search: 501/134, 501/135, 501/136, 501/137, 501/138, 501/139, 423/593, 423/598, 264/63
• US Class Current: 501/137
• CPC Class Codes: C01B 13/185 Preparing mixtures of oxides
• CPC Class Codes: C01G 1/02 Oxides
• CPC Class Codes: C01G 23/006 Alkaline earth titanates
• CPC Class Codes: C01P 2002/34 perovskite-type (ABO3)
• CPC Class Codes: C01P 2002/72 by d-values or two theta-values, e.g. as X-ray diagram
• CPC Class Codes: C01P 2002/88 by thermal analysis data, e.g. TGA, DTA, DSC
• CPC Class Codes: C01P 2004/51 Particles with a specific particle size distribution
• CPC Class Codes: C04B 35/465 based on alkaline earth metal titanates
• CPC Class Codes: C04B 35/4682 based on BaTiO3 perovskite phase

Abstract

Methods of producing ABO₃ compounds in which A represents a first metal ion and B represents a second metal ion from mixed metal coordination complexes are disclosed. The methods involve reacting compounds serving as a source of the B metal ion with a substituted aromatic compound, in solution, and thereafter reacting the metal coordination complex formed with a compound serving as a source of the A metal, in solution. An example is the reaction of titanium tetraisopropoxide with catechol to form a titanium catecholate coordination complex which is thereafter reacted with barium hydroxide octahydrate to form a pentamethanol barium triscatecholatotitanate mixed metal coordination complex which can be calcined at elevated temperatures to produce the ABO₃ compound, barium titanate (BaTiO₃), which is known to have outstanding dielectric, ferroelectric and piezoelectric properties. Portions of the A and/or B ions can be substituted with other metals.

Claims

1. A substituted mixed metal aromatic coordination complex [A·

Q_m ][B(L)_n (Ar)_o ] wherein A represents a first metal ion, B represents a second metal ion, Q represents a solvate, m represents the number of moles of Q, L represents oxygen or --OR wherein R can be hydrogen, saturated or unsaturated acyclic or cyclic alkyl, aryl or alkaryl, n is a number representing the moles of L, Ar represents a residue of a disubstituted aromatic compound, and wherein o represents the number of moles of Ar in the coordination complex with o being greater than zero and wherein a portion of the A ion or B ion, or both, is substituted with one or more additional metal ions.

2. A substituted mixed metal coordination complex of claim 1 wherein a portion of the A ion is substituted with one or more additional metal ions.

3. A substituted mixed metal coordination complex of claim 1 wherein a portion of the B ion is substituted with one or more additional metal ions.

4. A substituted mixed metal coordination complex of claim 2 wherein a portion of the B ion is substituted with one or more additional metal ions.

5. A mixed metal coordination complex of claim 1 wherein the A metal ion comprises a metal ion selected from Ba, Sr, Ca, Pb, Mg, La, Y, Bi, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Sc.

6. A mixed metal coordination complex of claim 1 wherein the B metal ion comprises a metal ion selected from Ti, Zr, Sn, Mn, Fe, Zn, Nb, W, Mg, Ta, Cu, Cr, Ru, Rh, Co, Hf, V, Sc, Mo and Ir.

7. A mixed metal coordination complex of claim 5 wherein the B metal ion comprises a metal ion selected from Ti, Zr, Sn, Mn, Fe, Zn, Nb, W, Mg, Ta, Cu, Cr, Ru, Rh, Co, Hf, V, Mo and Ir, and wherein the B metal ion can be Sc where the A metal ion is not Sc.

8. Solvated oxobiscatecholate.

9. Solvated oxobiscatecholate.