New layered perovskites, KSr2Nb3O10 and two new protonated niobates HSr2Nb3O10*1.2H2O and HSr2Nb3O10,were synthesized by solid state reaction and ion-exchange r
By using self-made metal-alkoxide yttrium isopropoxide as a sintering additive and disperser of whisker,the SiC whisker reinforced AlN ceramics was prepared.Its