Abstract
The polymorphic transformations of Ca2SiO4 and Na2BeF4H, have been studied by thermosonimetry, TS. The results for Na2BeF4 are compared with results from DSC-investigations. Thermosonimetry is shown to be a good and sensitive method for studying solid state transformations with high activation energies which accompany the α′-Ca2SiO4⇄γ-Ca2SiO4 and the α′-Na2BeF4⇄γ-Na2BeF4 transformations.
Zusammenfassung
Die polymorphen Umlagerungen von Ca2SiO4 und Na2BeF4 wurden thermosonimetrisch untersucht. Die für Na2BeF4 erhaltenen Ergebnisse werden mit Ergebnissen von DSC-Untersuchungen verglichen. Es wird gezeigt, dass die Thermosonimetrie eine gute und empfindliche Methode zur Untersuchung der hohe Aktivierungsenergien erfordernden Festkörperumlagerungen α′−Ca2SiO4 ⇌ γ−Ca2SiO4 und α′−Na2BeF4 ⇌ γ−Na2BeF4 ist.
Резюме
С помощью термосоним етрии изучены полиморфные превращ ения Ca2SiO4 и Na2BeF4. Результаты для Na2BeF4 сопоставлены с результатами ДСК ис следования. Показано, что термосониметрия является хорошим и чу вствительным методо м при изучении твердотельных превр ащений, протекающих с высокой энергией активации, как например, превращ ения α-Ca2SiO4 ¡ γ-Ca2SiO4 и α-Na2BeF4 ⇄ γ-Na2BeF4.
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This work has been supported by Borgestads Legat IV to J.L. Holm.
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Holm, J.L., Lønvik, K. Studies of the polymorphic transformations of dicalcium silicate (Ca2SiO4) and sodium tetrafluoroberyllate (Na2BeF4) by Thermosonimetry and differential scanning calorimetry. Journal of Thermal Analysis 25, 109–115 (1982). https://doi.org/10.1007/BF01913059
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DOI: https://doi.org/10.1007/BF01913059