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自从Hong等人发现了Nasicon相化合物Na_3Zr_2Si_2PO_(12)的超离子导电性能以来,人们对Nasicon及其相关结构的化合物进行了广泛的研究.这些化合物也表现出低热膨胀性能,可望作为抗热冲击材料和核废料储藏材料,NaZr_2(XO_4)_3(X=P,As)化合物是这一大类化合物的母体,其结构允许化学取代,从而能够得到许多同构化合物,这些化合物通常用固相反应法制备,较难以得到纯相和单晶.我们曾用水热法合成出纯相MTi_2(PO_4)_3(M=Li,Na,K),发现水热法优于固相反应法,F~-离子,作为矿化剂,对水热晶化有重要影响,我们曾在F~-体系中用水热晶化法生长出较大的完美的沸石单晶.本文描述了在F~-体系中用水热晶化法制备出
Nasicon and its related compounds have been studied extensively since Hong et al. Discovered the superionic ionic conductivity of the Nasicon phase compound Na_3Zr_2Si_2PO_ (12). These compounds also exhibit low thermal expansion and are expected to act as thermal shock Materials and nuclear waste storage materials, NaZr_2 (XO_4) _3 (X = P, As) compounds are the precursors of this large group of compounds whose structure allows for chemical substitution so that many isomorphic compounds can be obtained. These compounds are usually prepared by solid-phase reaction The pure phase MTi_2 (PO_4) _3 (M = Li, Na, K) has been synthesized by hydrothermal method and found that the hydrothermal method is better than the solid phase reaction method, the F ~ - ions, as a mineralizer, have an important effect on hydrothermal crystallization, and we have developed larger and perfect zeolite single crystals by hydrothermal hydrothermal method in the F ~ - system.In this paper, Prepared by hydrothermal method