Title:
【発明の名称】セラミックフィルタ素子用圧電磁器組成物
Document Type and Number:
Japanese Patent JP3007448
Kind Code:
B2
Abstract:
PURPOSE:To provide a piezoelectric porcelain compsn. for a ceramic filter element which hardly undergoes changes in the capacitance, resonance frequency and coefft. of mechanical quality before and after humidification, has excellent moisture resistance and can maintain its characteristics over a long period of time by making the amt. of Pb5CrO8 larger than that of Pb2CrO5. CONSTITUTION:In a lead titanate zirconate-based piezoelectric porcelain compsn. contg. chromium oxide and lead oxide, the amt. of Pb5CrO8 as the reactional product of the chromium oxide and lead oxide is made larger than that of Pb2CrO5 as other reactional product of the oxides. A piezoelectric porcelain compsn. for a ceramic filter element is obtd.
Inventors:
Hirofumi Ozeki
Minoru Kajita
Kunihiro Ushida
Minoru Kajita
Kunihiro Ushida
Application Number:
JP18293091A
Publication Date:
February 07, 2000
Filing Date:
June 27, 1991
Export Citation:
Assignee:
Nippon Special Ceramics Co., Ltd.
International Classes:
C04B35/49; H01L41/187; (IPC1-7): C04B35/49; H01L41/187
Domestic Patent References:
| JP4510310B1 |
Attorney, Agent or Firm:
Kiyomichi Kojima