INVESTIGATION OF THE PSEUDO-TERNARY SYSTEM SrNb 2 O 6 -NaNbO 3 -LiNbO 3
INVESTIGATION OF THE PSEUDO-TERNARY SYSTEM SrNb 2 O 6 -NaNbO 3 -LiNbO 3
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准三元系SrNb 2 O 6 -NaNbO 3 -LiNbO 3 的研究
DOI：
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发表时间：
1979
期刊：
影响因子：
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通讯作者：
Li Wen
中科院分区：
文献类型：
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作者：
Tang Di;L. Jing;Shi Ting;Zhang Yu;Tian Jing;Li Wen
采用差热分析（DTA）、热处理和x射线衍射等方法研究了伪三元体系srbn2o6 - nanbo3 - linbo2。在室温下，s2na (nbo3) 5 （s2n）是一种亚稳的中间化合物，具有钨青铜四方结构，a=12.36？c = 3.906 ?。linbo3在s2n中的溶解量最大可达10 mol%；在linbo3的5 ~ 10mol%范围内，s2n相变形为s2n′，属于正交体系，属于亚稳相。在900 ~ 1100℃长时间退火后，亚稳相s2n、s2n′分解为SrNb 2o - 6和基于nanbo3的固溶体相的混合物。建立了相应二元体系的相图和伪三元体系的等温截面。
The pseudo-ternary system SrNb 2 O 6 -NaNbO 3 -LiNbO 2 has been investigated by means of DTA, heat treatment and X-ray diffraction techniques. It has been found that at room temperature Sr 2 Na(NbO 3 ) 5 (S 2 N) is a metastable intermediate compound which has a tetragonal tungsten-bronze structure with a=12.36?, c=3.906?. LiNbO 3 can be dissolved in S 2 N up to a limit about 10 mol% ; and in the range of 5-10mol% of LiNbO 3 , the S 2 N phase is distorted into S 2 N′, which belongs to the orthorhombic system and is also a metastable phase. After long time annealing at 900-1100℃, the metastable phases S 2 N, S 2 N′ will decompose into a mixture of SrNb 2 O 6 and a phase of solid solution based on NaNbO 3 . The phase diagram of the corresponding binary systems and the isothermal section of the pseudo-ternary system have been established.