| 摘要 |
PURPOSE:To suppress a weight loss due to evaporation of phosphorus by blending oxides of Zr, P and Si with a salt of a specific element, calcining the resultant blend and providing a specified crystal phase. CONSTITUTION:A substance selected from ZrP2O7, (ZrO2)2P2O7, ZrO2, ZrSiO4, SiO2 and phosphates and silicates of R (R is element capable of providing di- to trivalent ions) and RO is used as raw materials. The above-mentioned raw materials are blended at a ratio so as to provide RyZr4SixP6-xO24 (R is one or more elements capable of providing di- to trivalent ions; x is a number of <=0 to <6; y is a number of >=2/3 to (4 satisfying electrical neutral conditions expressed by the formula) to afford a batch mixture, which is then formed into a compact. The resultant compact is subsequently calcined at about 1400-1800 deg.C for 2-10hr to provide a calcined compact containing 10wt.% crystal phase expressed by the afore-mentioned formula. The weight loss of the calcined compact is <=10% by heat treatment at 1400 deg.C for 100hr. |
