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    • 54. 发明公开
    • Crystal-oriented ceramics and methods for producing the same
    • Keramik mit Kristallorientierung und Verfahren zu ihrer Herstellung
    • EP0826643A1
    • 1998-03-04
    • EP97114864.8
    • 1997-08-27
    • KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO
    • Tani, Toshihiko, K.K. Toyota Chuo KenkyushoTakeuchi, Tsuguto, K.K. Toyota Chuo Kenkyusho
    • C04B35/475C04B35/491C04B35/495H01L41/187
    • H01L41/187C04B35/475C04B35/491C04B35/495
    • A crystal-oriented ceramic has an isotropic perovskite-type-structure of not smaller than 10 % in Lotgering orientation degree. The ceramic may contain at least one of Bi, Sr and Ca. A host material, a raw material capable of producing a guest material and an additive having the ability of converting a host material into a guest material are mixed and roll-pressed, and sintered under heat to give the crystal-oriented ceramic as a large-sized and bulky material. This crystal-oriented ceramic has good crystal orientation-dependent characteristics including piezoelectricity, pyroelectricity, ionic conductivity, giant magneto-resistivity effect, etc. This crystal-oriented ceramic can be produced by orienting epitaxially the multi-crystals of an isotropic perovskite oxide according to the orientation of the crystal plane or axis of a host material. The ceramic can be applied to an inexpensive and large-sized device. The host material may be a magnetoplumbite-type-structured or Sr 2 Nb 2 O 7 -type-structured material, and may be composed of morphologically-anisotropic grains.
    • 结晶取向陶瓷具有不高于10%的各向同性的钙钛矿型结构。 陶瓷可能含有Bi,Sr和Ca中的至少一种。 将主体材料,能够生产客体材料的原料和具有将主体材料转化为客体材料的能力的添加剂混合并辊压,并在加热下烧结,得到晶体取向陶瓷作为大尺寸陶瓷, 尺寸和体积大的材料。 该晶体取向陶瓷具有良好的晶体取向特性,包括压电性,热电性,离子导电性,巨磁电阻效应等。该晶体取向陶瓷可通过外延取向各向同性钙钛矿氧化物的多晶体 主体材料的晶面或轴的取向。 陶瓷可以应用于廉价和大尺寸的装置。 主体材料可以是磁铅石型结构或Sr2Nb2O7型结构材料,并且可以由形态各向异性晶粒组成。
    • 56. 发明公开
    • Piezoelectric ceramics
    • Piezoelektrische Keramiken
    • EP0739866A1
    • 1996-10-30
    • EP96106134.8
    • 1996-04-18
    • MURATA MANUFACTURING CO., LTD.
    • Hayashi, Kohichi, c/o Murata Manufact. Co., Ltd.Nada, Kenichi, c/o Murata Manufact. Co., Ltd.Shiratsuyu, Kosuke, c/o Murata Manufact. Co., Ltd.
    • C04B35/493H01L41/24
    • H01L41/187C04B35/493
    • A piezoelectric ceramic which maintains a high piezoelectric property in a composition having MPB structure and has an excellent ability for stabilizing the resonant frequency is provided. The piezoelectric ceramic has a solid solution expressed by the general expression xPbTiO3 - (1-x) PbZrO3 as its main component. The value of x in the above general expression causes the piezoelectric ceramic to have a composition having the morphotropic phase boundary structure. A ceramic having a spinel type structure is dispersed within the structure of the piezoelectric ceramic. The amount of the ceramic having the spinel type structure existing in the structure is set at about 5 volume % or less. Co2TiO4, Mn3O4, Fe3O4, Mg2TiO4 and a ceramic having a compound spinel type structure which is a solid solution of them can be used as the ceramic having the spinel type structure.
    • 提供了一种在具有MPB结构的组合物中保持高压电性能并且具有优异的稳定谐振频率的能力的压电陶瓷。 压电陶瓷具有以通式xPbTiO3 - (1-x)PbZrO3为主要成分表示的固溶体。 上述一般表达式中的x的值使得压电陶瓷具有具有正电相边界结构的组成。 具有尖晶石型结构的陶瓷分散在压电陶瓷的结构内。 存在于结构中的具有尖晶石型结构的陶瓷的量设定为约5体积%以下。 Co2TiO4,Mn3O4,Fe3O4,Mg2TiO4和具有尖晶石型结构的化合物尖晶石型结构的陶瓷可以用作具有尖晶石型结构的陶瓷。