采用慢度曲面法研究C12H9SN晶体的铁弹相变.在现有实验数据的基础上,模拟计算C 12 H9 SN晶体高温正交相的弹性劲度系数对慢度曲面的影响.结果表明,非对角元c12,c13,c23的变化对慢度曲面最大值的取向没有影响,同时也确定出与该相变直接相关的弹性劲度系数为c55.该晶体相变的对称性变化是由高温正交相mmm点群变成低温单斜相2/m点群.
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