High-pressure study of substrate material ScAlMgO4

Details High-pressure study of substrate material ScAlMgO4 High-pressure study of substrate material ScAlMgO4

2011-05-18

arxiv.org/abs/1105.3645v1

Physical Review B 83, 144104 (2011)

Physics

Condensed Matter

Materials Science

22 pages, 5 figures, 4 tables, 24 references

Scientific paper

10.1103/PhysRevB.83.144104

We report on the structural properties of ScAlMgO4 studied under quasi-hydrostatic pressure using synchrotron high-pressure x-ray diffraction up to 40 GPa. We also report on single-crystal studies of ScAlMgO4 performed at 300 K and 100 K. We found that the low-pressure phase remains stable up to 24 GPa. At 28 GPa, we detected a reversible phase transformation. The high-pressure phase is assigned to a monoclinic distortion of the low-pressure phase. No additional phase transition is observed up to 40 GPa. In addition, the equation of state, compressibility tensor, and thermal expansion coefficients of ScAlMgO4 are determined. The bulk modulus of ScAlMgO4 is found to be 143(8) GPa, with a strong compressibility anisotropy. For the trigonal low-pressure phase, the compressibility along the c-axis is twice than perpendicular one. A perfect lattice match with ZnO is retained under pressure in the pressure range of stability of wurtzite ZnO.

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