Coal materials, glass transition

A large variety of geological materials can be studied by EXAFS poorly organized solids — natural glasses or gels — natural solutions — coals. .. Apart from the major constituents (Si, Al,...), minerals contain minor ( 1 %) or trace (1-100 ppm) elements which often are transition metal ions. The study of these elements can give informations-on the physico-chemical conditions during the formation of minerals. 

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