Production of nonreducible dielectric ceramic composition
AssigneeMurata Manufacturing Co., Ltd.
InventorsNobuyuki Wada, Yoshiaki Kohno
Life of this patent
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Abstract
A nonreducible dielectric ceramic composition of a system, (A.sub.1-x R.sub.x).sub.y BO.sub.3, is produced using using at least one compound selected from the group consisting of water-soluble inorganic compounds and organic solvent-soluble organometallic compounds of rare earth element R together with oxides and/or carbonates of elements A and B.
Claims7
A method for production of nonreducible dielectric ceramic composition of a perovskite structure expressed by the general formula:
- (A.sub.1-x R.sub.x).sub.y BO.sub.3
- wherein A is at least one element selected from the group consisting of Ba, Sr, Ca and Mg, R is at least one rare earth element, B is at least one element selected from the group consisting of Ti, Zr and Sn, and x and y take respective values in the following ranges:
- 0.001.ltoreq.x.ltoreq.0.020, and 1.002.ltoreq.y.ltoreq.1.03,
- said method comprising the steps of
- (a) mixing at least one compound of element A selected from the group consisting of carbonates and oxides of element A, at least one compound of element B selected from the group consisting of oxides and carbonates of element B;
- and at least one compound of rare earth element R, so that a molar ratio of (A.sub.1-x R.sub.x)-site to B-site is not less than 1.002 but not more than 1.03, said at least one compound of rare earth element R being selected from the group consisting of water-soluble inorganic compounds and organic-solvent-soluble organometallic compounds;
- (b) milling the resultant mixture together with a suitable amount of a solvent;
- and
- (c) calcining the resultant mixture in an oxidizing atmosphere.
A method for production of nonreducible dielectric ceramic compositions of a perovskite structure expressed by the general formula:
- (A.sub.1-x R.sub.x).sub.y BO.sub.3
- wherein A is at least one element selected from the group consisting of Ba, Sr, Ca and Mg, R is at least one rare earth element, B is at least one element selected from the group consisting of Ti, Zr and Sn, and x and y take respective values in the following ranges:
- 0.001.ltoreq.x.ltoreq.0.020, and 1.002.ltoreq.y.ltoreq.1.03,
- said method comprising the steps of mixing at least one compound of element A selected from the group consisting of carbonates and oxides of element A, at least one compound of element B selected from the group consisting of oxides and carbonates of element B, and at least one compound of rare earth element R;
- and calcining the resultant mixture in an oxidizing atmosphere;
- said at least one compound of rare earth element R being selected from the group consisting of water-soluble inorganic compounds and organic-solvent-soluble organometallic compounds;
- said organometallic compounds being trisacetylacetonatocerium, trisacetylacetonatoneodymium, and trisacetylacetonatosamarium.
Dependencies are inferred from the claim text.