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A quenchable new high-pressure–high-temperature modification of antimony(III) oxide, γ-Sb2O3, has been obtained at hydrostatic pressures of 9–11 GPa and temperatures of 573–773 K. Its crystal structure has been determined from high-resolution synchrotron powder diffraction data. γ-Sb2O3 consists of three-dimensionally cross-linked infinite chains of SbO3E units (E = lone pair) with the chains forming tetragonal rod-packing. The underlying topology of γ-Sb2O3 (3,3T8) is found very rarely in inorganic structures; it is realised only for the polyanion [Si4O4N6]10− that occurs in the Ce4(Si4O4N6)O structure type. The structural relation to the two previously known polymorphs of Sb2O3 at ambient pressure, valentinite and senarmontite is discussed.
Supporting information
Cell refinement: TOPAS v4.1, Bruker-AXS, 2007; program(s) used to solve structure: Endeavour v1.4, Cyrstal-Impact, 2000-2006; program(s) used to refine structure: TOPAS v4.1, Bruker-AXS, 2007; molecular graphics: Diamond v3.1, Crystal Impact, 2011.
Antimony (III) trioxide
top
Crystal data top
O3Sb2 | c = 7.4771 Å |
Mr = 291.50 | V = 658.6 Å3 |
Orthorhombic, P212121 | Z = 8 |
Hall symbol: P_2ac_2ab | Synchrotron radiation |
a = 11.6411 (1) Å | T = 298 K |
b = 7.5666 Å | |
Data collection top
Multianalyser stage diffractometer | Si(111) monochromator |
Radiation source: ESRF ID31 | 2θmin = 1.0°, 2θmax = 25.84°, 2θstep = 0.002° |
Refinement top
Rp = 0.043 | Rexp = 0.021 |
Rwp = 0.067 | 82 parameters |
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top | x | y | z | Uiso*/Ueq | |
Sb1 | 0.2342 (2) | 0.4688 (2) | 0.4711 (3) | 0.5 (1) | |
Sb2 | 0.5116 (2) | 0.1844 (2) | 0.2784 (2) | 0.7 (1) | |
Sb3 | 0.0050 (2) | 0.2450 (2) | 0.2421 (3) | 0.7 (1) | |
Sb4 | 0.2382 (2) | 0.0095 (3) | 0.0142 (3) | 0.7 (1) | |
O1 | 0.4097 (14) | 0.4768 (19) | 0.162 (2) | 0.2 (3) | |
O2 | 0.1540 (14) | 0.403 (2) | 0.263 (2) | 1.4 (4) | |
O3 | 0.1029 (14) | 0.0264 (18) | 0.1951 (19) | 0.1 (3) | |
O4 | 0.0043 (18) | 0.1803 (15) | 0.5063 (19) | 1.5 (3) | |
O5 | 0.2481 (16) | 0.2408 (19) | 0.6186 (19) | 1.1 (4) | |
O6 | 0.3596 (16) | 0.0479 (19) | 0.301 (3) | 1.4 (4) | |
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