The Formation Mechanism of Domain Etch Patterns in Triglycine Sulfate Crystals

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Abstract
Conditions necessary for obtaining domain patterns in triglycine sulfate-water system were studied. Effects of surface charge, stirring, undersaturation and composition of etchants were examined by rub technique, jet technique and observation of etched crystal surfaces. Surface charge was necessary for revealing domains. Domain patterns were revealed at low undersaturations, while at high undersaturations dislocation pits. It was found that the positive glycinium ions play a major role in domain pattern detection while the negative sulfate ions a minor one. Domain pattern formation by etching in triglycine sulfate is probably due to the difference in the rate of diffusion of the glycinium ions into the solution between at the positive and at the negative ends of the dipole. The relation between the conditions required for revealing domains and those for revealing dislocation pits is discussed on the basis of current theories of crystal dissolution.

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