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The structural transformations in Beulah-Zap (BZ), Illinois (IL) no. 6, Upper Freeport (UF) and Pocahontas (POC) no. 3 coals on heat-treatment at 427, 800 and 1200 o C were examined by high-resolution transmission electron microscopy (HRTEM) technique. The stacking number and layer sizes of heat-treated coals were evaluated. The structural change in coal strongly depends on whether a coal...
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