The growth of silicon on various nitride coated quartz substrates were studied using in-situ observation of the solidification process. Three different coating types were used: One consisting entirely of alpha-Si3N4 particles, one of only beta-Si3N4 particles, and a third of a 50/50 mixture of the above mentioned coating powders. The mean particle size of the alpha- and beta-particles was about 0.3 mu m and 5.7 mu m, respectively. Three different cooling rates were used for each coating type: 2, 5 and 10 K/min. It was observed that the samples were similar at the lowest cooling rate, but at 5 K/min and higher the samples differed significantly. The biggest difference was seen in the alpha-particle coating, which showed significant dendritic growth, compared to the more faceted growth observed from the other coatings. All coatings containing the beta-particles showed similar growth characteristics. These samples were also analyzed by electron-backscattered diffraction (EBSD) on both the vertical and horizontal planes. No clear trend in preferred crystal orientations was observed; however, it was seen that the density of Sigma 3 boundaries, especially parallel twins, increased with cooling rate. A gradual increase in the Sigma 3 grain boundary density was seen for the coatings containing beta-Si3N4 particles, while the alpha-particle coating showed a faster increase. The grain sizes were also analyzed from the horizontal EBSD maps. Again there was a clear difference between the samples containing beta-particles and the sample with alpha-particle coating. The ones containing beta-particles showed a decrease in grain size with increasing cooling rate, while the opposite was true for the other alpha-particle coated samples. This was attributed to the rapid dendritic growth, which caused the grain structure to be dominated by one single grain. The difference in growth for the three coating types was explained using the athermal nucleation theory, which states that there is a correlation between particle sizes and nucleation undercooling. (C) 2017 Elsevier B.V. All rights reserved.