摘要:
A dielectric ceramic composition includes BaTiO3 as a main component; as subcomponents, with respect to 100 moles of BaTiO3, 0.9 to 2.0 moles of an oxide of RA in terms of RA2O3, where RA is at least one selected from Dy, Gd and Tb; 0.3 to 2.0 moles of an oxide of RB in terms of RB2O3, where RB is at least one selected from Ho and Y; 0.75 to 2.5 moles of an oxide of Yb in terms of Yb2O3; and 0.5 to 2.0 moles of an oxide of Mg in terms of Mg. when contents of oxide of RA, oxide of RB and oxide of Yb with respect to 100 moles of BaTiO3 are defined as “α”, “β” and “γ”, respectively, “α”, “β” and “γ” satisfy relations of 0.66≦(α/β)≦3.0 and 0.85≦(α+β)/γ≦2.4. According to the present invention, a dielectric ceramic composition having good properties can be provided.
摘要翻译:介电陶瓷组合物包括BaTiO 3作为主要成分; 作为亚组分,相对于100摩尔BaTiO 3,以RA 2 O 3换算为0.9-2.0摩尔RA的氧化物,其中RA是选自Dy,Gd和Tb中的至少一种; 以RB2O3计,0.3〜2.0摩尔的RB的氧化物,其中RB为选自Ho和Y中的至少一种; 0.75〜2.5摩尔Yb的氧化物换算成Yb 2 O 3; 以Mg计为0.5〜2.0摩尔的Mg的氧化物。 当将RA的氧化物,氧化物和Yb的氧化物相对于100摩尔BaTiO 3的含量分别定义为“α”,“bgr”和“γ”时,“α”,“bgr”和“γ” “满足0.66&nlE的关系;(α/&bgr;)≦̸ 3.0和0.85≦̸(α+&bgr;)/γ≦̸ 2.4。 根据本发明,可以提供具有良好性能的电介质陶瓷组合物。
摘要:
A dielectric ceramic composition comprising a main component expressed by a general formula (Ba1−x−ySrxCay)m(Ti1−zZrz)O3, Mg oxide, oxides of at least one kind selected from Mn and Cr, rare earth oxide, an oxide including Si and a composite oxide including Ba, Sr and Zr. The general formula shows that 0.20≦x≦0.40, 0≦y≦0.20, 0≦z≦0.30, and 0.950≦m≦1.050. Within a temperature range of −25 to 105° C., a capacitance change rate on the basis of a capacitance at 25° C. is within −15 to +5% with respect to slope “a” which shows capacity temperature characteristic on the basis of the capacitance at 25° C., and the slope “a” is −5500 to −1800 ppm/° C. By the present invention, a dielectric ceramic composition which is able to set the capacitance change rate to a predetermined range with respect to absolute value of capacity temperature characteristic within a wide temperature range even when the absolute value is large can be obtained.
摘要:
Production method of dielectric ceramic composition including a main component of (Ba1-x-ySrxCay)m(Ti1-zZrz)O3 comprises steps of preparing materials of a first main component of (Ba1-x1-ySrx1Cay)m(Ti1-zZrz)O3 and a second main component of (Ba1-x2-ySrx2Cay)m(Ti1-zZrz)O3, obtaining a material of the main component by mixing materials of the first and second main component, and fixing the material of the main component. When molar numbers of main component, first main component and second main component are 1, “a” and “b”, respectively, a+b=1, a:b=20:80 to 80:20, 0.20≦x≦0.40, x=(ax1+bx2), x1/x2≧1.05, 0≦y≦0.20, 0≦z≦0.30 and 0.950≦m≦1.050. By the present invention, the dielectric ceramic composition in which capacitance change rate is, set to the predetermined range with respect to an absolute value of capacity temperature characteristic, which is large, within wide temperature range can be obtained.