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Growth and characterization of K 1‐x (NH 4 ) x H 2 PO 4 mixed crystals onto z‐cut point seeds
Author(s) -
DeGao Zhong,
Bing Teng,
ShuHua Wang,
XueJun Jiang,
Ming Li,
LinXiang He,
WanXia Huang
Publication year - 2009
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200900331
Subject(s) - crystal (programming language) , crystallography , crystal structure , crystallographic defect , crystal growth , x ray crystallography , chemistry , materials science , diffraction , analytical chemistry (journal) , mineralogy , optics , physics , chromatography , computer science , programming language
Mixed crystals of potassium dihydrogen phosphate and ammonium dihydrogen phosphate were grown onto point seeds by the method of temperature reduction. It was found that the regeneration process of z‐cut point seeds became more and more difficult with increasing KH 2 PO 4 concentration in the solution mixture. The interior stress and cracking of the mixed crystals were analyzed by synchrotron X‐ray topography. Large numbers of stress stripes were found at the seed and sectors boundaries. The lattice parameters of the pyramid and prismatic sectors of the prepared mixed crystal were calculated according to the X‐ray diffraction patterns. With solution containing 8 mol % KH 2 PO 4 , the lattice volumes of the prismatic sector of the mixed crystal were 1.3% larger than that of the pyramid sector of the crystal. Chemical etching revealed microcracks with length of hundreds of microns in the mixed crystals, which tended to spread and led to crystal cracking. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)