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Title: A gold decoration study of the Suzuki phase 6NaC1-MnC1₂ in NaC1
Author: Gomez, Alfredo
ISNI:       0000 0001 3502 5986
Awarding Body: University of Warwick
Current Institution: University of Warwick
Date of Award: 1978
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In this research the gold decoration technique has been used to study the Suzuki phase precipitates 6NaC1MnC12 in Mn doped crystals slowly cooled from 650°C. The size distribution of the precipitates has been analyzed and found not to conform to the simple predictions of the Lifschitz Wagner theory for Ostwald Ripening; although in some instances a good fit was obtained to the theoretical distribution curves for bulk - diffusion and dislocation diffusion controlled processes, in disagreement with earlier treatments. Most precipitates have been found to be cubes in agreement with previous observations (9). Irregular structures, composed exclusively of steps, having an overall square shape and being highly localized are reported. These structures are believed to be the result of the interaction of the cleavage crack with precipitates close but not on the cleavage surfaces. The interrelations between the cleavage and slip structures with the precipitates have also been studied and a simple model that explains qualitatively the observed features is proposed. According to this model the peculiar decoration features of the Mn doped crystals arise as a result of different propagation speeds for the cleavage crack on the surface and on the precipitate areas.
Supervisor: Not available Sponsor: British Council ; Consejo Nacional de Ciencia y Tecnología (Mexico)
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: QD Chemistry ; QH Natural history