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• W2043960050 abstract "Abstract Temperature-programmed desorption (TPD) and differential-scanning calorimetry (DSC) analyses were performed on synthetic crystalline quartz, both “as received” and “hydrogen swept”, from 200 to 600°C. The TPD measurements allowed us to establish that interstitial hydrogen ions, present as charge compensators near trivalent aluminium ions substitutional for silicon, are removed from the crystal in the considered temperature range, mostly in the form of H2 molecules. In the hydrogen-swept samples, release of small amounts of other molecular groups, namely SiH4 and NaOH, was also observed. The DSC studies revealed the existence of a weak exothermic peak (enthalpy change ⋍ 0.90 J g−1) in the temperature range from 350 to 400°C. The exothermic process, only observable in hydrogen-swept samples, may tentatively be attributed to the total-energy variation involved in processes leading to H2 formation and to SiO4 tetrahedra relaxation after H2 release. The above results have been compared with the intensity variations, following annealing treatments, of near-infrared OH stretching vibrations and with time-transient effects observed in ionic conductivity measurements. The analysis contributes to a deeper understanding of the hydrogen-impurity dynamics in crystalline quartz." @default.
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• W2043960050 date "1996-06-01" @default.
• W2043960050 modified "2023-09-25" @default.
• W2043960050 title "Hydrogen desorption from crystalline quartz and some related differential-scanning calorimetry and conductivity phenomena" @default.
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• W2043960050 doi "https://doi.org/10.1016/0038-1098(96)00010-5" @default.
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