In:
Journal of Applied Crystallography, International Union of Crystallography (IUCr), Vol. 42, No. 3 ( 2009-06-01), p. 411-415
Abstract:
Yb:YAl 3 (BO 3 ) 4 is a good self-frequency-doubling crystal with the point group 32. In this paper, atomic force microscopy (AFM) has been used to observe the etch figures of the three forms (positive trigonal prism {11\overline 20}, negative trigonal prism {2\overline 1\overline 10} and rhombohedron {10\overline 11}) on the crystal morphology of Yb:YAl 3 (BO 3 ) 4 . The etch figures display the point group 32 of the Yb:YAl 3 (BO 3 ) 4 crystal. To compare the morphology and etch figures of Yb:YAl 3 (BO 3 ) 4 with those of quartz, the classic crystal of point group 32, the etch figures of the three forms (hexagonal prism {10\overline 10}, positive rhombohedron {10\overline 11} and negative rhombohedron {01\overline 11}) on quartz were also observed using AFM. It is interesting that Yb:YAl 3 (BO 3 ) 4 develops two prismatic forms (related by a positive–negative relationship) and one rhombohedral form, while quartz develops one prismatic form and two rhombohedral forms (also related by a positive–negative relationship). Etch figures of faces or sections with the same indices (or the same crystallographic orientations) in Yb:YAl 3 (BO 3 ) 4 and quartz are very similar, although their crystal structures are very different. Besides diffraction methods, etch figures are a useful method for determining the point group of a crystal.
Type of Medium:
Online Resource
ISSN:
0021-8898
DOI:
10.1107/S002188980901036X
Language:
Unknown
Publisher:
International Union of Crystallography (IUCr)
Publication Date:
2009
detail.hit.zdb_id:
2020879-0
Bookmarklink