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# New Transition Metal Phosphates Related to $KTiOPO_4$. Synthesis of $K_{0.5}M_{0.5}M'_{0.5}OPO_4 (M = Nb, Ta; M' = Ti, V)$ and $K_{1-x}Ti_{1-x}V_XOPO_4$ Exhibiting Nonlinear Optical Behavior

Gopalakrishnan, J and Rangan, Kasthuri K and Prasad, Raghavendra B and Subramanian, CK (1994) New Transition Metal Phosphates Related to $KTiOPO_4$. Synthesis of $K_{0.5}M_{0.5}M'_{0.5}OPO_4 (M = Nb, Ta; M' = Ti, V)$ and $K_{1-x}Ti_{1-x}V_XOPO_4$ Exhibiting Nonlinear Optical Behavior. In: Journal of Solid State Chemistry, 111 (1). pp. 41-47.

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## Abstract

Several transition metal phosphates of the general formula $KM_{0.5}M'_{0.5}OPO_4$, where $M = Nb^v$ or $Ta^v$ and $M' = Ti^{III}, V^{III}, Cr^{III}, Fe^{III}$, possessing the $KTiOPO_4$ (KTP) structure have been synthesized. Unlike KTP, none of these phosphates exhibit second harmonic generation (SHG) of the 1064-nm radiation. Soft-chemical oxidation of the $Ti^{III}$ and $V^{III}$ phosphates using chlorine in $CHCI3$, however, restores the SHG property to the oxidized materials, $K_{0.5}M_{0.5}M'_{0.5}OP0_4 (M = Nb^v, Ta^v; M' = Ti^{Iv}, V^{IV})$. $K_{1-x} Ti_{1-x}V_x OP0_4 (x \leq 0.25)$ prepared similarly from $KTi_{1-x}V_x OPO_4$ also exhibit SHG. The results reveal that exclusive presence of d° cations at the $Ti^{iv}$ site preserves the SHG response of KTP derivatives.

Item Type: Journal Article Copyright of this article belongs to Elsevier. Division of Chemical Sciences > Solid State & Structural Chemistry UnitDivision of Physical & Mathematical Sciences > Physics 08 Nov 2006 11 Feb 2011 05:14 http://eprints.iisc.ernet.in/id/eprint/8332

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