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The subsolidus phase relations of the ZnO-BaO-V2O5 ternary systems were investigated by means of X-ray diffraction analysis. There are three ternary compounds, nine binary compounds and sixteen 3-phase regions found in this system. The crystal structure of the ternary compound Ba2ZnV2O8 was refined by Rietveld profile fitting method and the powder diffraction pattern is given. A new ternary compound Ba3.4Zn0.8V4O14.2 has been found by the powder diffraction pattern. 相似文献
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三角函数的题目中,公式的正确运用与灵活变化会使解题变得轻松.尤其是运用到辅助角公式时,把公式灵活变形,会得到很好的效果. 相似文献
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《中学生数学》编辑部: 看到自己写的文章在喜欢的杂志上发表, 心情真是好极了.整整一个星期我都异常兴奋 …… 进入了高三,紧张的复习就开始了.随着 做过的题目越来越多,遇到的问题也多了.经 常苦思冥想不得头绪,好在我有《中学生数学》 在手,里面的文章令我受益匪浅.但我仍感到 不太满足,因为到了高三,对知识的渴求越发 相似文献
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