Hydrothermal crystal growth of 2-D and 3-D barium rare earth germanates: BaREGeO4(OH) and BaRE10(GeO4)4O8 (RE = Ho, Er)

JOURNAL OF ALLOYS AND COMPOUNDS

卷:786

Article

Fulle, Kyle^1,2  Sanjeewa, Liurukara D.^1,2  McMillen, Colin D.^1,2  De Silva, Channa R.³  Ruehl, Katarina³  Wen, Yimei^1,2  Chumanov, George^1,2  Kolis, Joseph W.^1,2 

[1] Clemson Univ, Dept Chem, Clemson, SC 29634 USA

[2] Clemson Univ, COMSET, Clemson, SC 29634 USA

[3] Western Carolina Univ, Dept Chem & Phys, Cullowhee, NC 28723 USA

关键词: Crystal growth;    Rare earth compounds;    Germanates;    X-ray diffraction;   

DOI  :  10.1016/j.jallcom.2019.01.185

来源: Elsevier

【 摘 要 】

Two new structural types of BaREGeO4(OH) and BaRE10(GeO4)(4)O-8 (RE = Ho3+,Er3+) single crystals were synthesized via high-temperature and high-pressure hydrothermal synthesis. The BaREGeO4(OH) compounds were found to crystallize in the orthorhombic space group Pbca. BaHoGeO4(OH) is used as a representative of the family with cell parameters of a= 5.7175(2) angstrom, b= 10.1556(5) angstrom, c= 10.6189(9) angstrom and V= 964.97(8) angstrom(3). The BaREGeO4(OH) structure contains a one-dimensional chain of rare-earth polyhedra linked through edge sharing of oxygen atoms. High density BaRE10(GeO4)(4)O-8 crystals crystallize in the monoclinic space group C2/m and feature a sheet like arrangement of rare-earth oxide polyhedra with Keggin-like features. BaHo10(GeO4)(4)O-8 is used as a representative of this structure type with cell parameters of a = 12.4533(8) angstrom, b =7.2008(5) angstrom, c = 12.0034(8) angstrom, beta = 100.183(2)degrees and V = 1059.43(12) angstrom(3). Barium polyhedra and isolated GeO4 units aid in connecting the rare earth oxide framework to extend it in three-dimensional (3-D) space. Characterization by single crystal X-ray diffraction and Raman and photoluminescence spectroscopies is reported. (C) 2019 Published by Elsevier B.V.

【 授权许可】

Free