The influence of high hydrostatic pressure on the crystal structure of cesium gold chloride (Cs2AuIAuIIICl6) in the pressure range up to 52 × 108Pa

When the temperature was increased from 77 K, the resonance lines became gradually weak without changing AV q and immeasurable above 215 K. ESR spectra taken at various temperatures revealed the presence of paramagnetic sites of ca. 5x 10 2<) mol -1 arising from Au(II). The small but finite concentration of Au(II) or some other reason should be responsible for the fade out phenomenon and the large Avq observed.

show abstract

“…2), indicating that there are two kinds of nonequivalent chlorine atoms in the crystal. This agrees with the results of X-ray analyses [1][2][3].…”

Section: Methodssupporting

confidence: 82%

A ³⁵Cl NQR Study on Cs₂[AU^ICl₂] [Au^IIICl₄]

Ishikawa

Kurasawa

Kitahara

et al. 1998

Zeitschrift Für Naturforschung A

View full text Add to dashboard Cite

show abstract

“…The associated MV-SV transition is consistent with the observation from Raman spectroscopy 7 , and charge density analysis from synchrotron powder XRD 21 . In the case of CsAuI 3 , the structural transition observed at ~5.9 GPa that breaks the tetragonal symmetry has not been observed in the chloride and bromide 4,5,6,9,15,21 support the notion of an incomplete valence transition at ~5.9 GPa. However, one must note that the measurement was conducted at 4K, at which temperature the first order transition can be very sluggish.…”

Section: Resultsmentioning

confidence: 59%

Pressure-induced symmetry breaking in tetragonal CsAuI3

et al. 2013

View full text Add to dashboard Cite

Results of in situ high pressure x-ray powder diffraction on the mixed valence compound Cs 2 Au I Au III I 6 (CsAuI 3 ) are reported, for pressures up to 21 GPa in a diamond anvil cell under hydrostatic conditions. We find a reversible pressure-induced tetragonal to orthorhombic structural transition at 5.5-6 GPa, and reversible amorphization at 12-14 GPa. Two alternative structures are proposed for the high-pressure orthorhombic phase, and are discussed in the context of a possible Au valence transition.2

show abstract

“…From these viewpoints, the relationship between the physical properties and the crystal structure of the perovoskite-type halides, Cs2AuIAuIIIX6 (X=Cl, Br, I) ( Fig. 1), which are well known as three-dimensional halogenbridged mixed-valence gold compounds, have been systematically investigated [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Its structure consists of a threedimensional metal-halogen framework formed by elongated octahedra with AuIII and compressed octahedra with AuI sharing their coners.…”

Section: Introductionmentioning

confidence: 99%