| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a dielectric ceramic composition having excellent ε<SB>r</SB>and Qu, and τ<SB>f</SB>which is within a practically sufficient range, and to provide its production method. <P>SOLUTION: The dielectric ceramic composition includes an SrLa<SB>4</SB>Ti<SB>4</SB>O<SB>15</SB>type crystal structure and contains Sr, La, Ti, and Nb. When the composition is expressed by compositional formula: aSrO-bLaO<SB>3/2</SB>-cTiO<SB>2</SB>-dNbO<SB>5/2</SB>(wherein, a, b, c and d are each molar ratio, and a+b+c+d=1), a is >0 and ≤0.556, b is >0 and ≤0.571, c is >0 and ≤0.444, and d is >0 and ≤0.444. The dielectric ceramic composition is characterized in that ε<SB>r</SB>is ≥35, Qu×f (TE<SB>011</SB>, f is measuring frequency) is ≥10,000 GHz, and τ<SB>f</SB>is -20 to +20 ppm/°C. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
