Abstract
The variation of triboluminescence intensity in tartaric acid, sodium tartrate, rochelle salt, dipotassium tartrate and ammonium tartrate crystals with the simultaneous charge produced at fracture has been studied. It is found that for the crystals of a given mass, the triboluminescence intensity and the simultaneous charge produced at fracture increase with crushing mass and both of them attain saturation values after particular values of crushing mass, for a given crushing height. The saturation value of the TL intensity increases, but the charge produced at fracture due to shock induced polarization decreases with increase of the crushing height. The TL is higher for those tartrate crystals which develop less charge at fracture. It has been concluded that in impulsive crushing, elastic stress in crystal increases due to the reduction of piezoelectric stress. Hence at higher values of the elastic stress, the moving dislocations are able to interact with more luminescent centres, due to which the TL intensity increases.
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