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1. 发明申请

US20020098969A1 Dielectric ceramic composition and laminated ceramic capacitor 有权
标题翻译：介电陶瓷组合物和层压陶瓷电容器
公开(公告)号：US20020098969A1
公开(公告)日：2002-07-25
申请号：US09993237
申请日：2001-11-05
申请人： Murata Manufacturing Co., Ltd.
发明人： Tomoyuki Nakamura , Kotaro Hata , Harunobu Sano
IPC分类号： C04B035/468 , C04B035/465 , C04B035/48
CPC分类号： B32B18/00 , C04B35/468 , C04B2235/768 , C04B2237/066 , C04B2237/068 , C04B2237/123 , C04B2237/346 , C04B2237/348 , C04B2237/68
摘要： Provided is a dielectric ceramic composition suitably used for forming dielectric ceramic layers which constitute a laminated ceramic capacitor obtained by firing in a reducing atmosphere. Even when the dielectric ceramic composition is formed into thin dielectric ceramic layers, a highly reliable laminated ceramic capacitor having a small temperature coefficient of capacitance, a long lifetime under high temperature and high pressure conditions, and a small change in electrostatic capacitance with time under a DC voltage application can be realized. The dielectric ceramic composition contains a primary component, an additive component, and an auxiliary sintering agent, wherein the primary component and the additive component are represented by the formula 100BaTiO3nullanull(1nullb)RnullbVnullnullcM, and 1.25nullanull8.0, 0 1.1 are satisfied. R is a compound containing at least one element selected from the group consisting of La, Ce, Pr, Nd, Sm, Eu, Gd, Th, Dy, Ho, Er, Tm, Yb and Lu; V is a compound containing vanadium; and M is a compound containing at least one element selected from the group consisting of Mn, Ni, Mg, Fe and Zn.
摘要翻译：提供一种适合用于形成介电陶瓷层的电介质陶瓷组合物，其构成通过在还原气氛中烧制获得的层叠陶瓷电容器。即使将介电陶瓷组合物形成为薄的电介质陶瓷层，也可以使用具有较小电容温度系数的高可靠性层叠陶瓷电容器，高温高压条件下的寿命长，可实现直流电压的应用。电介质陶瓷组合物包含主要组分，添加剂组分和辅助烧结剂，其中主要组分和添加剂组分由式100BaTiO3 + a {（1-b）R + bV} + cM表示，并且1.25 <= a <= 8.0,0 1.1。 R是含有选自La，Ce，Pr，Nd，Sm，Eu，Gd，Th，Dy，Ho，Er，Tm，Yb和Lu中的至少一种元素的化合物; V是含钒的化合物; M是含有选自Mn，Ni，Mg，Fe和Zn中的至少一种元素的化合物。

2. 发明申请

US20030147198A1 Dielectric ceramic, methods for making and evaluating the same, and monolithic ceramic electronic component 有权
公开(公告)号：US20030147198A1
公开(公告)日：2003-08-07
申请号：US10352038
申请日：2003-01-28
申请人： Murata Manufacturing Co., Ltd.
发明人： Hiroyasu Konaka , Tomoyuki Nakamura , Toshihiro Okamatsu , Harunobu Sano
IPC分类号： H01G004/06
CPC分类号： C04B35/48 , B32B18/00 , B32B2311/08 , C04B35/4682 , C04B2235/3203 , C04B2235/3206 , C04B2235/3208 , C04B2235/3213 , C04B2235/3215 , C04B2235/3217 , C04B2235/3224 , C04B2235/3225 , C04B2235/3227 , C04B2235/3229 , C04B2235/3236 , C04B2235/3239 , C04B2235/3241 , C04B2235/3262 , C04B2235/3267 , C04B2235/3272 , C04B2235/3275 , C04B2235/3279 , C04B2235/3409 , C04B2235/3418 , C04B2235/36 , C04B2235/6582 , C04B2235/6584 , C04B2235/785 , C04B2235/786 , C04B2235/85 , C04B2237/346 , C04B2237/408 , C04B2237/704 , H01G4/1227 , H01G4/1245
摘要： A dielectric ceramic has a ceramic structure of crystal grains and grain boundaries between the crystal grains. The crystal grains are of a main component represented by the formula ABO3 and an additive containing a rare earth element wherein A is at least one of barium, calcium, and strontium, barium being an essential element, and B is at least one of titanium, zirconium, and hafnium, titanium being an essential element. The average rare earth element concentration in the interior of the crystal grains is about 50% or less the average rare earth element concentration at the grain boundaries. Furthermore, about 20% to 70% of the crystal grains have a rare earth element concentration in the center of the crystal grain of at least about {fraction (1/50)} the maximum rare earth element concentration in a region extending inward from the surface by a distance corresponding to about 5% of the diameter of the crystal grain.

3. 发明申请

US20020072464A1 Dielectric ceramic, process for producing the same and multilayer ceramic capacitor 有权
标题翻译：介电陶瓷，制造相同和多层陶瓷电容器的工艺
公开(公告)号：US20020072464A1
公开(公告)日：2002-06-13
申请号：US09982361
申请日：2001-10-18
申请人： Murata Manufacturing Co., Ltd.
发明人： Tomoyuki Nakamura , Kentaro Sakai , Harunobu Sano
IPC分类号： C04B035/468 , C04B035/47 , C04B035/46 , C04B035/48 , C04B035/49
CPC分类号： H01G4/1245 , B32B18/00 , C04B35/4682 , C04B2235/6567 , C04B2235/658 , C04B2237/346 , C04B2237/66 , C04B2237/704 , H01G4/1227 , H01G4/1236
摘要： A dielectric ceramic includes ABO3 as a major component and R and M as accessory components, where A is at least one of Ba, Sr and Ca; B is at least one of Ti, Zr and Hf; R is at least one of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y; and M is at least one of Ni, Co, Fe, Cr and Mn. The dielectric ceramic contains the components R and M at about 70% or more of analysis points in grain boundaries. This dielectric ceramic is suitable for use in dielectric ceramic layers of a multilayer ceramic capacitor obtained by firing in a reducing atmosphere, has a long life at high temperatures and high voltages, exhibits less time-dependent change in electrostatic capacity under application of a direct-current voltage and has satisfactory reliability even when its thickness is reduced.
摘要翻译：介电陶瓷包括ABO 3作为主要成分，R和M作为辅助成分，其中A是Ba，Sr和Ca中的至少一种; B是Ti，Zr和Hf中的至少一种; R是La，Ce，Pr，Nd，Sm，Eu，Gd，Tb，Dy，Ho，Er，Tm，Yb，Lu和Y中的至少一种; M是Ni，Co，Fe，Cr和Mn中的至少一种。电介质陶瓷含有在晶界分析点的约70％以上的成分R和M。该电介质陶瓷适用于通过在还原气氛中烧制而获得的多层陶瓷电容器的介电陶瓷层，在高温和高电压下具有长寿命，在施加直流电压时具有较小的静电容量变化，即使当其厚度减小时也具有令人满意的可靠性。

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