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Structure and properties of TeO2 containing calcium borophosphate glasses
Authors: Mošner Petr | Vorokhta Maryna | Koudelka Ladislav
Year: 2013
Type of publication: článek v odborném periodiku
Name of source: Advanced Science, Engineering and Medicine
Publisher name: American Scientific Publishers
Place: Valencia
Page from-to: 1-6
Titles:
Language Name Abstract Keywords
cze Struktura a vlastnosti vápenatých borofosforečnanových skel s obsahem TeO2 Byl studován vliv obsahu TeO2 na strukturu a vlastnosti skel připravených v kompoziční řadě (100-x)[0.5CaO-0.1B2O3-0.4P2O5]-xTeO2. Z DTA křivek vyplynulo, že všechna skla resp. jejich podchlazené taveniny při zahřívání krystalizují. Krystalizační teplota klesá s rostoucím obsahem TeO2, stejně tak jako teplota skelné transformace a termická stabilita skel. Produktem krystalizace jsou zejména sloučeniny BPO4, Ca2P2O7 a Ca4P6O19. Chemická odolnost skel se snižuje s rostoucim obsahem TeO2. Do borofosfátové strukturní sítě se TeO2 zabudovává ve formě jednotek TeO3 a TeO4. S rostoucím obsahem TeO2 se zvyšuje podíl jednotek TeO4. borofosforečnanová skla; telluritová skla; struktura; vlastnosti
eng Structure and properties of TeO2 containing calcium borophosphate glasses Calcium borophosphate glasses doped with TeO2 were studied in the compositional series (100-x)[0.5CaO-0.1B2O3-0.4P2O5]-xTeO2 in a concentration range of x = 0-30 mol% TeO2. DTA studies showed that all of glasses crystallize on heating within the temperature region of 600-750°C and the surface nucleation mechanism prevails over the internal one. Compounds formed by crystallization were BPO4, Ca2P2O7 and Ca4P6O19. Glass transition temperature and crystallization temperature decrease with increasing TeO2 content as well as the thermal stability of glasses. The addition of TeO2 to the starting calcium borophosphate glass also resulted in a gradual decrease of the chemical durability of glasses. According to the Raman spectra, TeO2 is incorporated in the structural network in the form of TeO3 and TeO4 structural units and the ratio of TeO4/TeO3 increases with increasing TeO2 content in the glasses. Borophosphate Glasses, Tellurite Glasses, Structure, Properties

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