The temperature dependence of the rate of growth of PbO/2B 2 O 3 from lead borate melts with PbO/B 2 O 3 mole ratios of 1/3,1/2, 2/3, and 1 was determined. The maximum growth rates occurred from those melts which contained a slight excess of PbO. The results are explained on the basis of a modification in the structure of the melt in the interfacial zone as the PbO content is changed. Such changes markedly affect the fluidity of the melt, alter the concentration of crystallizable species, and may reduce the driving force for crystallization.
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Eagan et al. (1970) studied this question.
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