| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a dielectric porcelain composition for high-frequency having a high specific dielectric constant ε<SB>r</SB>and a high Q value, whose temperature coefficient of a resonance frequency is arbitrarily controllable around 0 ppm/°C and cost is industrially reduced. <P>SOLUTION: The composition is represented by the compositional formula:Baä(Sn<SB>a</SB>Zr<SB>1-a</SB>)<SB>x</SB>(Zn<SB>b</SB>Mg<SB>1-b</SB>)<SB>y</SB>(Nb<SB>c</SB>Ta<SB>1-c</SB>)<SB>z</SB>}<SB>v</SB>O<SB>w</SB>(wherein x+y+z=1; and (w) is a positive number necessary for keeping an electrical neutrality as a porcelain) and, in a three-component compositional diagram representing a compositional ratio of ä(Sn<SB>a</SB>Zr<SB>1-a</SB>)<SB>x</SB>(Zn<SB>b</SB>Mg<SB>1-b</SB>)<SB>y</SB>(Nb<SB>c</SB>Ta<SB>1-c</SB>)<SB>z</SB>}, (x, y, z) is in a range enclosed by a polygon A, B, C, and D formed by connecting A(0.050, 0.300, 0.650), B(0.400, 0.190, 0.410), C(0.400, 0.210, 0.390), and D(0.050, 0.330, 0.620) and (a), (b), (c), and (v) are 0.5≤a≤1.0, 0.2≤b≤1.0, 0.3≤c<1.0, and 0.98≤v≤1.03, respectively. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
