### Abstract

The crystal structure of Rb_{5}B_{19}O_{3}, monoclinic, sp. gr. C2lc, a = 18.211(3), b = 11.519(2), c = 13.310(2) Å, β= 95.63(1)°, V = 2778(1) Å^{3}, Z = 4, d_{calc} = 2.714 g/cm^{3}. It is determined by X-ray diffraction analysis (P2_{1} Syntex diffractometer, MoKα radiation, 2280 reflections, R = 0.050) starting from the atomic coordinates for the isotructural K_{5}B_{19}O_{31}. The thermal vibrations of Rb and O atoms are considered in the anisotropic approximation. The structure is a three-dimensional framework built of complicated anions of four types: triangles; tetrahedra; [B^{IV}B^{III}
_{2}O_{5}]^{-} ringsconsisting of two triangles and a tetrahedron; and double [B^{IV}B^{III}
_{4}O_{8}]^{-} rings consisting of two simple rings with sharing a tetrahedron. Alternating ordinary and double rings form helical chains about the 2_{1} screw axes. Contraction of these chains during heating is presumably the main reason for a strong anisotropy of thermal strain revealed in the crystals by high-temperature X-ray diffraction method.

Original language | Russian |
---|---|

Pages (from-to) | 187-192 |

Number of pages | 6 |

Journal | Crystallography Reports |

Volume | 44 |

Issue number | 2 |

Publication status | Published - 1 Mar 1999 |

### Scopus subject areas

- Condensed Matter Physics

### Cite this

*Crystallography Reports*,

*44*(2), 187-192.

}

*Crystallography Reports*, vol. 44, no. 2, pp. 187-192.

**Crystal structure and thermal expansion of Rb5B19O31.** / Krzhizhanovskaya, M. G.; Bubnova, R. S.; Bannova, I. I.; Filatov, S. K.

Research output

TY - JOUR

T1 - Crystal structure and thermal expansion of Rb5B19O31

AU - Krzhizhanovskaya, M. G.

AU - Bubnova, R. S.

AU - Bannova, I. I.

AU - Filatov, S. K.

PY - 1999/3/1

Y1 - 1999/3/1

N2 - The crystal structure of Rb5B19O3, monoclinic, sp. gr. C2lc, a = 18.211(3), b = 11.519(2), c = 13.310(2) Å, β= 95.63(1)°, V = 2778(1) Å3, Z = 4, dcalc = 2.714 g/cm3. It is determined by X-ray diffraction analysis (P21 Syntex diffractometer, MoKα radiation, 2280 reflections, R = 0.050) starting from the atomic coordinates for the isotructural K5B19O31. The thermal vibrations of Rb and O atoms are considered in the anisotropic approximation. The structure is a three-dimensional framework built of complicated anions of four types: triangles; tetrahedra; [BIVBIII 2O5]- ringsconsisting of two triangles and a tetrahedron; and double [BIVBIII 4O8]- rings consisting of two simple rings with sharing a tetrahedron. Alternating ordinary and double rings form helical chains about the 21 screw axes. Contraction of these chains during heating is presumably the main reason for a strong anisotropy of thermal strain revealed in the crystals by high-temperature X-ray diffraction method.

AB - The crystal structure of Rb5B19O3, monoclinic, sp. gr. C2lc, a = 18.211(3), b = 11.519(2), c = 13.310(2) Å, β= 95.63(1)°, V = 2778(1) Å3, Z = 4, dcalc = 2.714 g/cm3. It is determined by X-ray diffraction analysis (P21 Syntex diffractometer, MoKα radiation, 2280 reflections, R = 0.050) starting from the atomic coordinates for the isotructural K5B19O31. The thermal vibrations of Rb and O atoms are considered in the anisotropic approximation. The structure is a three-dimensional framework built of complicated anions of four types: triangles; tetrahedra; [BIVBIII 2O5]- ringsconsisting of two triangles and a tetrahedron; and double [BIVBIII 4O8]- rings consisting of two simple rings with sharing a tetrahedron. Alternating ordinary and double rings form helical chains about the 21 screw axes. Contraction of these chains during heating is presumably the main reason for a strong anisotropy of thermal strain revealed in the crystals by high-temperature X-ray diffraction method.

UR - http://www.scopus.com/inward/record.url?scp=0033096388&partnerID=8YFLogxK

M3 - статья

AN - SCOPUS:0033096388

VL - 44

SP - 187

EP - 192

JO - Crystallography Reports

JF - Crystallography Reports

SN - 1063-7745

IS - 2

ER -