• Massons, J.
• Aguiló, M.
• Díaz, F.
• Pujol, M. C.
• Suriñach, Santiago
• Mateos, X.
• Aznar, A.
• Monfort, Xavier Solans

Abstract

The crystal structure of monoclinic KLu(WO4)2 (KLuW) crystals was determined at room temperature by using single-crystal X-ray diffraction data. The unit-cell parameters were a = 10.576 (7), b = 10.214 (7), c = 7.487 (2) Å, β= 130.68 (4)°, with Z = 4, in space group C2/c. The unit-cell parameters of KLu1-xYbx(WO 4)2 were determined in relation to Yb concentration. Vickers micro-indentations were used to study the microhardness of KLuW. The linear thermal expansion tensor was determined and the principal axis with maximum thermal expansion (α′333 = 16.72 × 10 -6 K-1), X′3, was located 13.51° from the c axis. The room-temperature optical tensor was studied in the near-infrared (NIR) and visible range. The principal optical axis with maximum refractive index (ng = 2.113), Ng, was located 18.5° from the c axis at 632.8 nm. Undoped and ytterbium-doped KLuW crystals were grown by the TSSG (top-seeded-solution growth) slow-cooling method. The crystals show {110}, {111}, {010} and {310} faces that basically constitue the habit of the KLuW crystals. © 2006 International Union of Crystallography Printed in Great Britain - all rights reserved.

Topics

• x-ray diffraction
• thermal expansion
• space group
• Ytterbium