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    • 2. 发明授权
    • Dielectric ceramic and dielectric device
    • 介质陶瓷和电介质器件
    • US06762142B2
    • 2004-07-13
    • US10251585
    • 2002-09-19
    • Kojiro OkuyamaJunichi KatoHiroshi KagataKenji Iijima
    • Kojiro OkuyamaJunichi KatoHiroshi KagataKenji Iijima
    • C04B35465
    • C04B35/49C04B35/6262C04B2235/3206C04B2235/3249C04B2235/3251C04B2235/3262C04B2235/3275C04B2235/3284C04B2235/604C04B2235/786C04B2235/94C04B2235/96H01P7/10
    • A dielectric ceramic is made of a sintered body of a complex oxide including at least one element selected from the group consisting of Zr, Ti and Mn, at least one element selected from the group consisting of Mg, Zn and Co, and at least one element selected from the group consisting of Nb and Ta, wherein, the complex oxide is represented by a formula xZrO2-yTiO2-zA(1+w)/3B(2−w)/3O2 where ‘A’ in the formula denotes at least one element selected from the group (A) consisting of Mg, Zn and Co, ‘B’ denotes at one element selected from the group (B) consisting of Nb and Ta; x, y, z and w denote values in the respective ranges of 0.20≦x≦0.55, 0.40≦y≦0.55, 0.05≦z≦0.25, and 0≦w≦0.30, and x, y and z have a relationship represented as x+y+z=1; MnO is present in a range of 0.1 mol % to 1.0 mol % to the complex oxide; and an average grain size of the dielectric ceramic is from 10 &mgr;m to 70 &mgr;m, thereby providing a dielectric ceramic that has a high dielectric constant (&egr;r) and an unloaded (Qu) value even in a comparatively low frequency region as a microwave region i.e., in a range of 0.4 GHz to 2.4 GHz and that realizes a desired temperature coefficient (&tgr;f) of a resonant frequency with a high mechanical strength, and thus a dielectric device using the dielectric ceramic is provided.
    • 电介质陶瓷由包含选自Zr,Ti和Mn中的至少一种元素的复合氧化物的烧结体,选自Mg,Zn和Co中的至少一种元素和至少一种 元素选自Nb和Ta,其中复合氧化物由式xZrO2-yTiO2-zA(1 + w)/ 3B(2-w)/ 3O2表示,其中式中的“A”至少表示 选自由Mg,Zn和Co组成的组(A)中的一种元素,'B'表示选自Nb和Ta组成的组(B)中的一种元素; x,y,z和w分别表示0.20 <= x <= 0.55,0.40 <= y <= 0.55,0.05 <= z <= 0.25,0 <= w <0.30的各个范围内的值,x, y和z具有表示为x + y + z = 1的关系; MnO以0.1mol%至1.0mol%的范围存在于复合氧化物中; 并且电介质陶瓷的平均晶粒尺寸为10μm至70μm,从而提供即使在作为微波区域的较低频率区域中也具有高介电常数(ε)和无载(Qu)值的电介质陶瓷,即 ,在0.4GHz至2.4GHz的范围内,并且实现具有高机械强度的谐振频率的期望温度系数(tauf),因此提供了使用电介质陶瓷的电介质器件。
    • 3. 发明授权
    • Piezoelectric ceramic composition and piezoelectric element containing the same
    • 压电陶瓷组合物和含有它的压电元件
    • US06514427B2
    • 2003-02-04
    • US10008890
    • 2001-11-13
    • Masamitsu NishidaKeiichi TakahashiKojiro OkuyamaJunichi Kato
    • Masamitsu NishidaKeiichi TakahashiKojiro OkuyamaJunichi Kato
    • C04B3500
    • C04B35/01C04B35/495H01L41/1873
    • The present invention provides a piezoelectric ceramic composition that can be manufactured easily by an ordinary sintering method, is free from lead, and has a large frequency constant, a small grain size, and a high mechanical Q. This composition is expressed by a formula of (1-v-w)[(Li1-x-yNaxKy)zRO3].vLMnO3.wBi1/2Na1/2TiO3. The present invention also provides a piezoelectric ceramic composition, including at least one selected from Mn, Cr, and Co that is added to a composition expressed by a formula of (Li1-x-yNaxKy)zRO3 so as to have a ratio thereof to the whole of 0.01 to 1 wt % in terms of MnO2, Cr2O3, and CoO, respectively. In the above-mentioned formulae, 0≦v≦0.05, 0≦0.2, v+w>0, 0.2≦x≦0.97, 0≦y≦0.8, x+y≧0.8, 0.98≦z≦1, L indicates at least one element selected from the rare earth elements, and R denotes at least one element selected from Nb, Ta, and Sb.
    • 本发明提供一种压电陶瓷组合物,其可以通过常规烧结方法容易地制造,不含铅,具有大的频率常数,小的晶粒尺寸和高的机械Q.该组成由式 (1-vw)[(Li1-x-yNaxKy)zRO3] .vLMnO3.wBi1 / 2Na1 / 2TiO3。 本发明还提供一种压电陶瓷组合物,其包含选自Mn,Cr和Co中的至少一种,其被添加到由式(Li1-x-yNaxKy)zRO3表示的组成中,以使其与 分别为MnO 2,Cr 2 O 3和CoO的0.01〜1重量%。 在上述公式中,0 <= v <= 0.05,0 <= 0.2,v + w> 0,0.2 <= x <= 0.97,0 <= y <= 0.8,x + y> = 0.8,0.98 <= z <= 1,L表示选自稀土元素中的至少一种元素,R表示选自Nb,Ta和Sb中的至少一种元素。
    • 8. 发明授权
    • Dielectric ceramic composition
    • 介电陶瓷组合物
    • US5153154A
    • 1992-10-06
    • US724884
    • 1991-07-02
    • Junichi KatoHiroshi Kagata
    • Junichi KatoHiroshi Kagata
    • C01G33/00C04B35/497
    • C04B35/497C01G33/006C01P2006/40C01P2006/80
    • A dielectric ceramic composition possessing a high relative dielectric constant, a high unloaded Q value, and an excellent temperature characteristic is expressed as xPbO-.sub.y (Mg.sub.1/3 Nb.sub.2/3)O.sub.2 -zCaO, where x+y+z=1, and x, y, z are in the following ranges, 0.05.ltoreq.x.ltoreq.0.45, 0.4.ltoreq.y.ltoreq.0.55, 0.15.ltoreq.z.ltoreq.0.4, or expressed as xPbO-y(Ni.sub.1/3 Nb.sub.2/3) O.sub.2 -zCaO, where x+y+z=1, and x,y, z are in a quadrangular region with vertexes at A (x=0.25 y=0.7 z=0.05), B (x=0.2 y=0.7 z=0.1), C (x=0.2 y=0.45 z=0.35), and D (x=0.35 y=0.45 z=0.2), which are composition points of a ternary system with vertexes at PbO, (Ni.sub.1/3 Nb.sub.2/3)O.sub.2, and CaO.
    • 具有高相对介电常数,高无载Q值和优异温度特性的介电陶瓷组合物表示为xPbO-y(Mg1 / 3Nb2 / 3)O2-zCaO,其中x + y + z = 1,x ,y,z在以下范围内,0.05≤x≤0.45,0.4≤y≤0.55,0.15≤z≤0.4,或表示为xPbO-y(Ni1 / 3Nb2 / 3)O2-zCaO,其中x + y + z = 1,x,y,z处于A(x = 0.25y = 0.7z = 0.05)的顶点的四边形区域,B(x = 0.2 y = 0.7 z = 0.1),C(x = 0.2 y = 0.45 z = 0.35)和D(x = 0.35 y = 0.45 z = 0.2),它们是具有PbO顶点的三元体系的组成点(Ni1 / 3Nb2 / 3)O2和CaO。