Revelation of dislocation etch pits in mixed crystals of ammonium-potassium sulphate,[K_1_x(NH_4)_x]-2SO_4

摘要

Defect configurations in as-grown mixed crystals of ammonium-potassium sulphate have been revealed by chemical etch technique with greater details for the first time. Interesting features like symmetrical pyramidal pits, circular terraced pits, row of closely spaced pits forming low angle tilt boundary indicating branching of dislocations etc. were clearly observed using aqueous solutions of various inorganic salts (etchants) applied for different timings. It is found that addition of a salt generally promotes the formation of good pits.