| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a microwave dielectric porcelain composition having a high εr value and a high Qf value, capable of freely control the τf value centering around zero, and high and stable in service life under high temperature and high load and in mechanical strength of the porcelain, and a method of manufacturing the porcelain. <P>SOLUTION: The basic composition component of this composition is expressed by xSr<SB>a</SB>TiO<SB>2+a</SB>-yLmAlO<SB>3</SB>-zLn(Mg<SB>1/2</SB>Ti<SB>1/2</SB>)O<SB>3</SB>wherein formulation rate a is in the range of 1≤a≤2, Lm and Ln are at least one selected from the group consisting of La, Pr. Nd, and Sm, if setting x+y+z=100, x, y, and z, are each independently in the range of 35<x<60, 0.1<y<65, and 0.1<z<65, respectively. By adding oxide components of Na, Mn, Fe, W, V, Pb, Hf, etc., as an additive, εr value is controlled not smaller than 40, Qf value not smaller than 70,000, and τf value plus or minus centering around zero. As for its manufacturing method, first a feed powder is formed in a pellet, then pulverized and controlled in a minute powder and a calcined powder is made, and finally it is fired in an MgO air permeable vessel to obtain stable characteristics. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
