On the formation of etch grooves around stress fields due to inhomogeneous impurity distribution in KH2PO4 single crystals

B. Dam*, W. J.P. Van Enckevort

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

Abstract

It is shown that planar strain fields in potassium dihydrogen phosphate (KDP) single crystals, can be made visible as macroscopic etch grooves by etching polished {100}, {101} and {001} slices. These planar strain fields are due to inhomogeneous impurity distributions in the crystal, for instance at the boundary of two growth sectors with different impurity contents or at the boundaries of the growth bands within a single growth sector. The sensitivity of this method is similar as for X-ray diffraction topography, but by etching a higher resolution (less than 1μm) can be obtained. The formation of the etch grooves and the increasing sensitivity of the etch method for the {100}, {101} and {001} plates successively is explained analogous to the thermodynamic dislocation theory of dissolution of crystals as formulated by Cabrera and Levine, combined with a consideration of some nucleation models for the initial opening up of the groove.

Original languageEnglish
Pages (from-to)607-623
Number of pages17
JournalJournal of Crystal Growth
Volume51
Issue number3
DOIs
Publication statusPublished - Mar 1981

Bibliographical note

Funding Information:
thankful to Professor P. Bennema, Dr. J.P. van der Eerden and Ir. B. van der Hoek for stimulating discussions and critical reading of the manuscript. One of us (W.J.P. van Enckevort) acknowledges the support of the Netherlands Foundation for Pure Research, ZWO/ SON.

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