镁橄榄石和顽辉石的高温高压合成  

Olivine and Pyroxene Syntheses under High Temperature and High Pressure

作　　者：杜勇慧[1] 张铁臣[1] 苏作鹏[1] 崔启良[1] 

机构地区：[1]吉林大学超硬材料国家重点实验室,吉林长春130012

出　　处：《高压物理学报》2006年第3期281-284,共4页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金资助项目(10299040)

摘　　要：用国产六面顶压机，在温度为10001500℃和压力为2～5GPa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 （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.

关 键 词：二氧化硅 氧化镁 镁橄榄石 顽辉石 高温高压 

分 类 号：P574.1[天文地球—矿物学] O521.9[天文地球—地质学]