Tdk Corporation

Tdk Xiamen Co., Ltd.

Kakeru Watanabe

Ryohei Nakano

Yasuo Niwa

Masaru Abe

Matsumi Watanabe

Daisuke Ohtsu

Fan Zhang

Guibin Ge

Jintao Huang

RuiLun Zhang

Kazuya Muto

The present invention relates to the dielectric composition including barium titanate, strontium titanate, titanium oxide and bismuth oxide. In case when the content of barium titanate, converted to BaTiO, is a mol %, the content of strontium titanate, converted to SrTiO, is b mol %, the content of titanium oxide and bismuth oxide, converted to BiTiO, is c mol %, and a+b+c=100, a, b and c are values within a scope surrounded by the following four points, i.e. point A, point B, point C and point D in a three-dimensional phase diagram. Point A: (a, b, c)=(52.1, 40.0, 7.9); point B: (a, b, c)=(86.5, 5.6, 7.9); point C: (a, b, c)=(91.0, 5.6, 3.4); point D: (a, b, c)=(56.6, 40.0, 3.4).

Dielectric composition and electric components

A dielectric ceramic composition comprising forsterite in an amount of 93.0 to 99.0 mol % when calculating in terms of 2MgO.SiOand calcium titanate in an amount of 1.0 to 7.0 mol % when calculating in terms of CaTiOas main components, and as a subcomponent, aluminum oxide in an amount of 0.2 to 5 mass % when calculating in terms of AlOper 100 mass % of said main components. According to the present invention, a dielectric ceramic composition, capable of having both low permittivity and good frequency-temperature characteristic as well as ensuring high Qf value and further having sufficient mechanical strength, and suitable to use in an antenna, a filter and the like used in the high-frequency region, can be provided. Also, the present invention allows providing a dielectric ceramic composition further having resistance to reduction in addition to all of the above properties.

Dielectric ceramic composition

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Tokyo, Japan

Kakeru Watanabe