arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1005.0264cond-mat.mtrl-sciphysics.geo-ph
收藏

ZnGa2O4中的后尖晶石转变和状态方程:高压下原位X射线衍射测定

Post-spinel transformations and equation of state in ZnGa2O4: Determination at high-pressure by in situ x-ray diffraction

D. Errandonea, Ravhi S. Kumar, F. J. Manjon, V. V. Ursaki, E. V. Rusu

摘要:

室温角色散X射线衍射测量尖晶石ZnGa 2 O 4高达56 GPa的两个结构相变的证据。在31.2 GPa下,ZnGa 2 O 4经历了从立方尖晶石结构到类似于ZnMn 2 O 4的四方尖晶石结构的转变。在55 GPa,第二次过渡到斜方晶系的marokite结构(CaMn 2 O 4型)发生。确定了立方尖晶石ZnGa_2 O_4的状态方程:V_0 = 580.1(9)A_3,B_0 = 233(8)GPa,B_0 '= 8.3(4),B_0“= -0.1145 GPa ~(-1)(隐含值),表明ZnGa_2 O_4是迄今为止研究的可压缩性较低的尖晶石之一。对于四元结构,还确定了状态方程:V_0 = 257.8(9)A_3,B_0 = 257(11)GPa,B_0 ′ = 7.5(6),B_0 ″ = -0.0764 GPa ~(-1)(隐含值)。报道的结构序列与NiMn 2 O 4和MgMn 2 O 4中发现的结构序列一致。

英文摘要:

Room temperature angle-dispersive x-ray diffraction measurements on spinel ZnGa2O4 up to 56 GPa show evidence of two structural phase transformations. At 31.2 GPa, ZnGa2O4 undergoes a transition from the cubic spinel structure to a tetragonal spinel structure similar to that of ZnMn2O4. At 55 GPa, a second transition to the orthorhombic marokite structure (CaMn2O4-type) takes place. The equation of state of cubic spinel ZnGa2O4 is determined: V0 = 580.1(9) A3, B0 = 233(8) GPa, B0'= 8.3(4), and B0''= -0.1145 GPa-1 (implied value); showing that ZnGa2O4 is one of the less compressible spinels studied to date. For the tetragonal structure an equation of state is also determined: V0 = 257.8(9) A3, B0 = 257(11) GPa, B0'= 7.5(6), and B0''= -0.0764 GPa-1 (implied value). The reported structural sequence coincides with that found in NiMn2O4 and MgMn2O4.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑