Crystal growth and characterisation of KTiOAsO4

Crystals of potassium titanyl arsenate were prepared by top seeded solution growth from a tungstate flux. X-ray topography revealed extensive growth b anding in several sectors, associated with temperature induced fluctuations in composition and impurity content. This was confirmed to some extent by energy dispersive X-ray analysis measurements which revealed significant le vels of tungsten incorporation from the flux and higher levels of iron impu rity from the starling materials. The overall dislocation density in (0 1 1 ) and (0 0 1) growth sectors was determined to be < 10(2) cm(-2). X-ray dif fraction rocking curve measurements confirmed a low average strain across t he crystal. Q 2001 Published by Elsevier Science B,V.