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The cell assembly for high-pressure experiments.
Optical micrographs with (a) reflected light and (b) transmitted light, and (c) an SEM photograph of the ReN2 sample synthesized under 7.7 GPa at 1873 K.
XRD profile of the sample rotating with oscillation by a Gandolfi type camera. Tick marks represent the calculated positions of the diffraction peaks of the ReN2. The difference (dotted line) between observed (crosses) and fitted patterns (thin line) is shown in the same scale (MoKα: λ = 0.071073 nm). Inset shows a conventional XRD profile with Bragg-Brentano geometry of the oriented sample synthesized at 1873 K under 7.7 GPa (CuKα: λ = 0.154059 nm).
Crystal structures of ReB2 and ReN2.
The pressure dependence of (a) lattice parameters a- and c-axes of the ReN2 sample (solid line). The data of ReB2 are indicated for comparison (dashed line). (b) Bulk compression curve of the ReN2 sample. The bulk modulus was determined by fitting the Birch-Murnaghan equation of state to the P-V data (solid squares).
X-ray photoelectron spectroscopy spectra of the sample synthesized at 1873 K under 7.7 GPa.
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