| 摘要 |
PURPOSE:To improve the no-load Q value of a composition expressed by means of a composition formula xPbO-y (Mg1/3Nb2/3)O2-z/CaO by substituting TiO2 partly for the (Mg1/3Nb2/3)O2 of magnesium lead calcium niobate. CONSTITUTION:A dielectric porcelain composition, containing lead oxide, calcium oxide, titanium oxide, magnesium oxide, and niobium oxide, is expressed by a composition formula (Pb1-xCax) (Mg1/3Nb2/3)1-yTiyO3. (X) and (Y) are set so as to stay within the area of a quadrangle taking points A, B, C, and D as vertices in a xy plane (where, the points on a line AB, where y=0, are excluded). That is, it is possible to obtain a high dielectric constant, excellent temperature characteristic, and a high Q value in a microwave area by substituting TiO2 partly for the (Mg1/3Nb2/3)O2 of magnesium lead calcium niobate (PbCa) (Mg1/3Nb2/3)O3. It is also possible to obtain change due to temperature of small resonance frequency in xPbO-y (Mg1/3Nb2/3)O2-zCaO system at a high relative dielectric constant, and to improve a non-load Q value thereof. |
