【摘要】 对固溶体ＣａＭｇＳｉ＿２Ｏ＿６－ＮａＡｌＳｉ＿２Ｏ＿６相转变过程中的临界压力ｐ和临界温度Ｔ之间的关系进行了研究，得到ｐ与Ｔ之间为一线性关系：ｐ＝１．５４×１０￣（－２）Ｔ－１４．３（ＧＰａ）。另外，在临界条件下，对合成的单斜辉石的微观结构进行了ＳＥＭ观察，发现在较高的临界压力和临界温度下，样品晶粒粗壮、紧密，并且主要沿（００１）面生长成纤维状。控制一定的过冷却度使其在成核区停留一段时间之后升温到生长区，样品的ＳＥＭ观察结果显示与上述结论一致。更多还原

【Abstract】 The critical pressure and critical temperature in the phase transformation of clinopyroxene solid so-lution CaMgSi₂O₆（diopside,Di）-NaAlSi₂O₆（jadeite,Jd）from glass were investigated. The equation of phasetransformation of Di_0.4-Jd_0.6 is given as follows:p=1.54×10￣（-2）T-14.3 （GPa）.The penetrating fibrous grainsof Di-Jd are mainly grown along the direction of c-axis under the higher critical preessure and at the higher criti-cal temperature. At lower critical pressure and temperature the penetrating fibrous grains are shorter,looser anddisordered.更多还原