以溶胶-凝胶法和固相反应方法分别合成了硅酸盐氧基磷灰石A2La8(SiO4)6O2(A=Ca,Sr,Ba),经XRD表征,证明所得产品为磷灰石相.和固相反应方法相比,溶胶-凝胶法合成磷灰石反应温度低,高温焙烧时问短.电化学阻抗谱研究表明:随着A(A=Ca,Sr,Ba)半径的增大,电导率也逐步加大,活化能却逐步减小.700℃时溶胶·凝胶法合成的Ba2La8(SiO4)6O2的电导率(4.42×10-6S·cm-1)要比固相反应法合成的电导率大一个数量级.离子迁移数和氧分压对电导率的研究表明,主要的电荷载体是O2-离子.
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