Open AccessINVESTIGATION OF THE PSEUDO-TERNARY SYSTEM SrNb<sub>2</sub>O<sub>6</sub>-NaNbO<sub>3</sub>-LiNbO<sub>3</sub>
Author(s) -
Tang Di-Sheng,
Jingkui Liang,
Shi Ting-Jun,
Yuling Zhang,
JingHua Tian,
Wenxiu Li
Publication year - 1979
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.28.62
Subject(s) - ternary operation , materials science , physics , computer science , programming language
The pseudo-ternary system SrNb2O6-NaNbO3-LiNbO2 has been investigated by means of DTA, heat treatment and X-ray diffraction techniques. It has been found that at room temperature Sr2Na(NbO3)5(S2N) is a metastable intermediate compound which has a tetragonal tungsten-bronze structure with a=12.36?, c=3.906?. LiNbO3 can be dissolved in S2N up to a limit about 10 mol% ; and in the range of 5-10mol% of LiNbO3, the S2N phase is distorted into S2N′, which belongs to the orthorhombic system and is also a metastable phase. After long time annealing at 900-1100℃, the metastable phases S2N, S2N′ will decompose into a mixture of SrNb2O6 and a phase of solid solution based on NaNbO3. The phase diagram of the corresponding binary systems and the isothermal section of the pseudo-ternary system have been established.