Phase transition of synthetic zinc ferrite spinel (ZnFe2O4) at high pressure, from synchrotron X-ray powder diffraction
Phase transition of synthetic zinc ferrite spinel (ZnFe2O4) at high pressure, from synchrotron X-ray powder diffraction
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DOI：
10.1007/s002690000117
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发表时间：
2000-11
影响因子：
1.4
通讯作者：
D. Levy;A. Pavese;M. Hanfland
中科院分区：
文献类型：
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作者：
D. Levy;A. Pavese;M. Hanfland
在法国格勒诺布尔ESRF （Grenoble, France）的ID9光束线上，用x射线粉末衍射研究了合成锌铁氧体（理想情况下为ZnFe2O4，矿物名称为franklinite）在37gpa下的温度。高压是通过DAC实现的。利用Birch-Murnaghan函数研究了镁铝尖晶石的P-V状态方程，并将由此推断的弹性性质[K0= 166.4（±3.0）GPa K0′= 9.3（±0.6）K0″=−0.22 GPa−1]与先前测定的镁铝尖晶石和磁铁矿进行了比较。采用Rietveld细化法研究了zn -铁素体的结构行为随压力的变化规律，并从尖晶石向CaTi2O4-或mnfe2o4样结构转变的角度进行了解释；这种转变发生在24gpa以上。
Synthetic Zn-ferrite (ideally ZnFe2O4; mineral name: franklinite) was studied up to 37 GPa, by X-ray powder diffraction at ESRF (Grenoble, France), on the ID9 beamline; high pressure was achieved by means of a DAC. The P-V equation of state of franklinite was investigated using the Birch-Murnaghan function, and the elastic properties thus inferred [K0= 166.4(±3.0) GPa K0′= 9.3(±0.6) K0″= −0.22 GPa−1] are compared with earlier determinations for MgAl-spinel and magnetite. The structural behaviour of Zn-ferrite as a function of pressure was studied by Rietveld refinements, and interpreted in the light of a phase transition from spinel to either CaTi2O4- or MnFe2O4-like structure; this transformation occurs above 24 GPa.