镁橄榄石和顽辉石的高温高压合成

 用国产六面顶压机，在温度为1 000～1 500 ℃和压力为2～5 GPa的高温高压条件下，对氧化镁（MgO）和二氧化硅（SiO₂）混合粉末样品进行了处理。通过对所得产物的观察与X射线衍射分析结果表明，在较宽的压力范围内，可以得到镁橄榄石（Mg₂SiO₄）单晶体和顽辉石（MgSiO₃）单晶体。讨论了地幔物质镁橄榄石（Mg₂SiO₄）和顽辉石（MgSiO₃）的生成条件、生长特性及相变关系。

Olivine and Pyroxene Syntheses under High Temperature and High Pressure

Olivine (Mg₂SiO₄) and pyroxene (MgSiO₃) single crystals were synthesized under high temperature (1 000~1 500 ℃) and high pressure (2~5 GPa) using the mixed powder of magnesium oxide (MgO) and silicon dioxide (SiO₂) as starting materials. Results by TEM and XRD tests showed that the products increased with the temperature rising or the pressure decreasing. Meanwhile, phase transition relationship existed between Mg₂SiO₄ and MgSiO₃ in this p-T ranges, and the mixed phase of Mg₂SiO₄-MgSiO₃ would turn into the single phase of MgSiO₃ at given pressure and temperature. The growth condition and character of Mg₂SiO₄ and MgSiO₃ as well as phase transition relationship between Mg₂SiO₄ and MgSiO₃ were discussed respectively.