The crystal structure of α-SrGaBO<SUB>4</SUB> by Z. Yang, X. L. Chen, J. K. Liang, M. He, and J. R. Chen

Crystal Research and Technology

Cryst. Res. Technol. 39, 634 (2004) - Abstract -

The crystal structure of α-SrGaBO₄

Z. Yang, X. L. Chen, J. K. Liang, M. He, and J. R. Chen

Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, P. O. Box 603, Beijing 100080, P. R. China

Keywords	α-SrGaBO₄, borate, structure determination, powder X-ray diffraction, DTA
PACS	61.66.Hq
DOI	10.1002/crat.200310235

A new compound α-SrGaBO₄ has been synthesized by solid state reaction at high temperatures, and its structure has been solved by direct methods from powder X-ray diffraction. α-SrGaBO₄ has an orthorhombic system, Pccn space group, with lattice parameters a = 15.3154(7) Å, b = 8.9186(4) Å, c = 5.8130(3) Å, and Z = 8. The structure consists of infinite chains run parallel to the c axis and built up of GaO₄ tetrahedral and BO₃ triangles. The basic unit of these chains is a six - membered Ga₂BO₈ ring formed by two GaO₄ tetrahedra and one BO₃ triangles. The Sr atom is bonded to eight oxygen atoms. The strontium atoms serve to hold the chains together through co-ordination with oxygen atoms. DTA curve of noncrystalline glassy SrGaBO₄ was discussed. The XRD results show no phase transition occurs between -173°C and 127°C.

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