High-pressure and high-temperature synthesis of rhenium carbide using rhenium and nanoscale amorphous two-dimensional carbon nitride¹

1 This article is associated with 7th Asian Conference on High Pressure Research (ACHPR-7), Bangkok, Thailand.

Figures & data

Table 1. Compilation of experimental bulk moduli reported so far

	Reference	a (Å)	c (Å)	B (GPa)
Re2C	Juarez-Arellano et al. (2009)	2.836 (4)	9.86 (4)	405 (30)	Exp.
Re2C	This work	2.8437 (3)	9.8467 (8)	386 (10)	Exp.
Re3N	Friedrich et al. (2010)	2.8105 (5)	7.154 (2)	395 (7)	Exp.
Re2N	Friedrich et al. (2010)	2.8442 (5)	9.796 (2)	401 (10)	Exp.
Re3C	Miao et al. (2011)	2.849	7.181	394	DFT

Note: No experimental data is known for Re₃C.

Figure 1. (a) Cross-sectional view of synthesized sample that looks like cloud in Pt capsule (white). Dark smooth part in white-grey sample is epoxy resin. Scale bar at bottom right is 100 μm. Initial outer diameter of Pt capsule is 2 mm, and it is about 3 mm in height. (b) Magnified SEM photograph.

Figure 2. Measured EDS signals of synthesized sample. Re and C, and small amount of N and O were detected.

Table 2. Composition of synthesized Re compound

	Re	C	N	O
at %	56.0	27.6	8.3	8.1

Figure 3. Raman spectra of synthesized sample.

Note: Laser spot (1 μm) for measurement is small enough in comparison with synthesized sample area.

Figure 4. Rietveld refinements from XRD data with RIETAN-FP (Izumi & Momma, 2007). (a) Crystalline phases in simulation are Re₂C, Pt, and graphite. (b) Crystal structure of Re₂C parallel (left) or perpendicular (right) to c-axis.

Note: Large silver dots are Re, and the small brown dots are C.

Figure 5. High-pressure XRD patterns of increasing (a) and decreasing (b) pressure were recorded at PF, Tsukuba using DAC. Dependences of volume, and a- and c-axes on pressure are shown in panel (c).

Notes: Black and red squares indicate experimental data for increasing and decreasing pressure, respectively. Compression data show kink at 10 GPa. Blue dotted vertical line at 10 GPa is guide for eye to show the beginning of this critical change. Solid line on volume compression data is fit line to third-order Birch–Murnaghan EOS.

Figure 6. Full width at half maximum (FWHM) of (0 0 6) and (1 1 0) diffraction lines of XRD spectra obtained from experiment at PF.

Notes: Figure 6(a–d) are measured profiles. Each profile is shifted to zero degree and overlapped for comparison. Black and red dots are FWHM for increasing and decreasing pressure (e), respectively.

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