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Citation: Fu Zhengmin, Li Wenxiu, Dai Jinbi, Liang Dongcai. REFINEMENT OF THE CRYSTAL STRUCTURE OF RbI0₃·2HI0₃ AND ITS CENTROSYMMETRIC DEGREE[J]. Acta Physico-Chimica Sinica, ;1987, 3(01): 35-41. doi: 10.3866/PKU.WHXB19870107 shu

REFINEMENT OF THE CRYSTAL STRUCTURE OF RbI0₃·2HI0₃ AND ITS CENTROSYMMETRIC DEGREE

1.
Institute of Physics; Academia Sinica
Institute of Biophysics; Academia Sinica

Received Date: 26 July 1985
Available Online: 15 February 1987

The crystal structure of the compound RbIO_3·2HIO_3 has been redetermined by heavy-atom method and refined by full matrix least-squares method. The crystal belongs to triclinic system with cell dimensions; a=0.8332 nm, b=0.8232 nm, c=0.8264 nm; α=60.66°, β=85.80°, γ=66.10°. Z= 2, D_m = 4.61 g cm~(-3). The structure is non-centrosymmetric; nevertheless, it has a high degree of centrosymmetry, as a measurement of it, < |△r|>w=0.009 nm. The reliable factor is R=0.076.
Three O atoms are bound to each I atom with mean distance of about 0.18 nm forming a distorted IO_3~- triangular cone; in addition other three neighbour O atoms are bound to it with distances of 0.25—0.33 nm. These six O atoms and their centering I atom form a distorted IO_6 octahedron. Nine O atoms are bound to each Rb atom with distances of 0.286—0.351 nm forming a RbO_9 polyhedron.
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REFINEMENT OF THE CRYSTAL STRUCTURE OF RbI03·2HI03 AND ITS CENTROSYMMETRIC DEGREE

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REFINEMENT OF THE CRYSTAL STRUCTURE OF RbI0₃·2HI0₃ AND ITS CENTROSYMMETRIC DEGREE