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• W2138076841 abstract "Cristobalite is a common mineral in volcanic ash produced from dome-forming eruptions. Assessment of the respiratory hazard posed by volcanic ash requires understanding the nature of the cristobalite it contains. Volcanic cristobalite contains coupled substitutions of Al 3+ and Na + for Si 4+ ; similar co-substitutions in synthetic cristobalite are known to modify the crystal structure, affecting the stability of the α and β forms and the observed transition between them. Here, for the first time, the dynamics and energy changes associated with the α–β phase transition in volcanic cristobalite are investigated using X-ray powder diffraction with simultaneous in situ heating and differential scanning calorimetry. At ambient temperature, volcanic cristobalite exists in the α form and has a larger cell volume than synthetic α-cristobalite; as a result, its diffraction pattern sits between ICDD α- and β-cristobalite library patterns, which could cause ambiguity in phase identification. On heating from ambient temperature, volcanic cristobalite exhibits a lower degree of thermal expansion than synthetic cristobalite, and it also has a lower α–β transition temperature (∼473 K) compared with synthetic cristobalite (upwards of 543 K); these observations are discussed in relation to the presence of Al 3+ and Na + defects. The transition shows a stable and reproducible hysteresis loop with α and β phases coexisting through the transition, suggesting that discrete crystals in the sample have different transition temperatures." @default.
• W2138076841 created "2016-06-24" @default.
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• W2138076841 date "2014-06-14" @default.
• W2138076841 modified "2023-10-03" @default.
• W2138076841 title "The α–β phase transition in volcanic cristobalite" @default.
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• W2138076841 doi "https://doi.org/10.1107/s160057671401070x" @default.
• W2138076841 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4119948" @default.
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