J. Appl. Cryst. (2002). 35, 108-112 [doi:10.1107/S0021889801019914]
Abstract: The crystal structure of monoclinic KYb(WO4)2 (KYbW) crystals has been refined (in space group C2/c) at room temperature by using single-crystal X-ray diffraction data. KYbW undoped crystals were grown by the TSSG (top-seeded-solution growth) slow-cooling method. The crystals show {110}, {
11}, {010} and {310} faces, which basically define their habit. The linear thermal expansion tensor has been determined and the principal axis with maximum thermal expansion (
= 16.68 × 10-6 K-1), 
, was located 12° from the c axis. Its principal 
, 
and axes are [302], [010] and [106] directions, respectively, in the crystallographic system. The optical tensor has been studied at ![[bold lambda]](/logos/entities/lambda_bdgif.gif)
= 632.8 nm at room temperature; two principal axes, Ng and Nm, are located in the ac plane, while the other, Np, is parallel to [010]. The principal axis with maximum refractive index (ng = 2.45), Ng, was located 19° from the c axis.
Online 22 January 2002
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