Dielectric porcelain composition
AssigneeNgk Spark Plug Co., Ltd.
InventorsAkifumi Tosa, Jun Otsuka, Manabu Sato
Life of this patent
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Abstract
A dielectric porcelain composition comprising Ba, Nd, Pr, Bi, Ti and at least one of Na and K and satisfying a condition that when the composition is expressed by composition formula: BaO-aNdO3/2-bPrO11/6-cBiO3/2-dTiO2-eAO1/2, wherein A is at least one of Na and K, and a, b, c, d and e represent a molar ratio, a, b, c, d and e are in respective ranges of 1.5≦a≦2.6, 0.02≦b≦1.00, 0.2≦c≦0.6, 4.5≦d≦5.5 and 0.02≦e≦0.30.
Claims8
A dielectric porcelain composition comprising Ba, Nd, Pr, Bi, Ti and at least one of Na and K and satisfying a condition that when the composition is expressed by composition formula:
- BaO-aNdO3/2-bPrO11/6-cBiO3/2-dTiO2-eAO1/2, wherein A is at least one of Na and K, and a, b, c, d and e represent a molar ratio, a, b, c, d and e are in respective ranges of 1.5≦a≦2.6, 0.02≦b≦1.00, 0.2≦c≦0.6, 4.5≦d≦5.5 and 0.02≦e≦0.30.
A dielectric porcelain composition obtained by blending at least one of:
- metal oxide powders of Ba, Nd, Pr, Bi, Ti and at least one of Na and K;
- and metal compounds capable of converting into the respective metal oxides by heating, to satisfy a condition that when the composition is expressed by composition formula:
- BaO-aNdO3/2-bPrO11/6-cBiO3/2-dTiO2-eAO1/2, wherein A is at least one of Na and K, molar ratio of the respective metal elements in terms of oxide is 1.5≦a≦2.6, 0.02≦b≦1.00, 0.2≦c≦0.6, 4.5≦d≦5.5 and 0.02≦e≦0.30, and burning the blend.
Dependencies are inferred from the claim text.