SbSb_xM_1-xO₄ (M=Nb^V or Ta^V): Solid Solution Behavior and Second-Harmonic Generating Properties

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In this Subject: <a title="Chemistry (General)" href="/content/subcat?j_subject=166&j_availability=">Chemistry (General)
By this author: Ok K.M. ;&nbsp; Bhuvanesh N.S.P. ;&nbsp; Halasyamani P.S.

Authors: Ok K.M.; Bhuvanesh N.S.P.; Halasyamani P.S.

Source: Journal of Solid State Chemistry, Volume 161, Number 1, October 2001 , pp. 57-62(6)

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Abstract:

The solid solution behavior and second-harmonic generating (SHG) properties of SbSb_xM_1-xO₄ (M=Nb^V or Ta^V) (x=0.0, 0.2, 0.4, 0.5, 0.6, 0.8, and 1.0) have been investigated by powder X-ray diffraction and nonlinear optical (NLO) measurements. Both SbNbO₄ and SbTaO₄ form solid solutions with -Sb₂O₄. All the materials crystallize in the non-centrosymmetric space group Pna2₁, with Sb^IIIO₄E polyhedra linked to M^VO₆ (M^V=Sb^V, Nb^V, or Ta^V) octahedra. SHG data is presented for the solid solutions and -Sb₂O₄, SbNbO₄, and SbTaO₄. With respect to the SbSb_xM_1-xO₄ phases, NLO measurements indicate a substantial decrease in SHG efficiency for x0.6. This decrease is attributable to the “nonpolar” nature of the Sb^VO₆ octahedra compared with the polar nature of Nb^VO₆ or Ta^VO₆. Copyright 2001 Academic Press.