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Chemical etching; etch pit shapes; etch pit orientation; chemical polishing; calcium fluoride; etching of CaF₂

{110} surfaces of CaF₂ crystals are etched with different concentrations of HCl. It is found that concentrated HCl produces characteristic rectangular pyramidal etch pits and 2 volume percent HCl produces boat shaped etch pits. Such variations in the etch pit shapes on {110} surfaces of CaF₂ crystals with different concentrations of HCl have been explained. Concentrated H₂SO₄ is found to be a suitable chemical polisher for these surfaces, the polishing rate is about 0·1μ/min.

G C Jain¹ L C Jain^{1 2} T S Murty^{1 3}

1. Department of Applied Physics, Government Engineering College, Jabalpur - 482 011 M.P., India
2. Department of Physics, Government Engineering College, Rewa - 486 002, India
3. University of Sagar, Sagar, India

Published

December 1981

Manuscript received

25 October 1980