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Mechanoluminescence; triboluminescence; luminescence; ferroelectricity; crystal fracture; high pressure phenomena

Mechanoluminescence spectra of triglycine sulfate, guanidine aluminium sulfate, rochelle salt, diglycine manganous chloride dihydrate, lithium ammonium tartate monohydrate and potassium dihydrogen phosphate crystals resemble the discharge spectra of nitrogen gases. Glycine silver nitrate, thiourea, ammonium sulfate and azobenzene crystals, the structure of which is centrosymmetric at room temperature, do not show mechanoluminescence. Following the role of crystal structure, the mechanoluminescence excitation is discussed on the basis of the piezo-electrification of the new surfaces created during fracture of the crystals.

B P Chandra^{1 2} K K Shrivastava¹

1. Department of Physics, Government College of Science, Raipur - 492 002
2. Department of Chemistry, University of California, Los Angeles, California - 90024, USA

Published

December 1979

Manuscript received

5 June 1979

Manuscript revised

29 August 1979