Calorimetric study of vitreous and crystalline alkali metal borates |
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Authors: | N M Vedishcheva B A Shakhmatkin M M Shultz |
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Institution: | (1) Institute of Silicate Chemistry, Academy of Sciences of the USSR, Leningrad, USSR |
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Abstract: | The enthalpies of solution in 2 N nitric acid at 298 K were measured for alkali metal borate glasses and crystals. From the data obtained, their enthalpies of formation from the oxides and the heats of crystallization of the glasses were calculated.The negative deviation from ideality observed in alkali metal borate systems is interpreted in terms of the acid-base interaction of their components. The heats of crystallization of the glasses appeared to be mainly determined by the ordering effect of the boron-oxygen network. The contents of different borate groupings in the glasses studied were estimated. The structures of the borate glasses are discussed.
Zusammenfassung Für Alkaliborat-Gläser und Kristalle wurden die Lösungsenthalpien in 2N Salpetersäure bei 298 K gemessen. Daraus wurden die Enthalpien der Bildung aus den Oxiden sowie die Kristallisationswärmen der Gläser berechnet. Die negativen Abweichungen der Bildungsenthalpien vom idealen Verhalten werden als Resultat der Säure-Base-Umsetzung der Oxide gedeutet. Die Kristallisationswärmen der Gläser scheinen im wesentlichen von ordnungsvorgängen des Bor-Sauerstoff-Netzwerks bestimmt zu scin. Der Gehalt der Gläser an den verschiedenen Boratgruppen wird abgeschätzt und die Struktur der Boratgläser diskutiert.
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![dcy](/content/u470037277766700/xxlarge1076.gif) ![ncy](/content/u470037277766700/xxlarge1085.gif) ![ocy](/content/u470037277766700/xxlarge1086.gif) ![gcy](/content/u470037277766700/xxlarge1075.gif) ![ocy](/content/u470037277766700/xxlarge1086.gif) ![tcy](/content/u470037277766700/xxlarge1090.gif) ![ocy](/content/u470037277766700/xxlarge1086.gif) ![vcy](/content/u470037277766700/xxlarge1074.gif) . ![Ocy](/content/u470037277766700/xxlarge1054.gif) ![pcy](/content/u470037277766700/xxlarge1087.gif) ![rcy](/content/u470037277766700/xxlarge1088.gif) ![iecy](/content/u470037277766700/xxlarge1077.gif) ![dcy](/content/u470037277766700/xxlarge1076.gif) ![iecy](/content/u470037277766700/xxlarge1077.gif) ![lcy](/content/u470037277766700/xxlarge1083.gif) ![iecy](/content/u470037277766700/xxlarge1077.gif) ![ncy](/content/u470037277766700/xxlarge1085.gif) ![scy](/content/u470037277766700/xxlarge1089.gif) ![ocy](/content/u470037277766700/xxlarge1086.gif) 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![ncy](/content/u470037277766700/xxlarge1085.gif) ![ycy](/content/u470037277766700/xxlarge1099.gif) ![bcy](/content/u470037277766700/xxlarge1073.gif) ![ocy](/content/u470037277766700/xxlarge1086.gif) ![gcy](/content/u470037277766700/xxlarge1075.gif) ![acy](/content/u470037277766700/xxlarge1072.gif) ![tcy](/content/u470037277766700/xxlarge1090.gif) ![ycy](/content/u470037277766700/xxlarge1099.gif) ![gcy](/content/u470037277766700/xxlarge1075.gif) ![rcy](/content/u470037277766700/xxlarge1088.gif) ![ucy](/content/u470037277766700/xxlarge1091.gif) ![pcy](/content/u470037277766700/xxlarge1087.gif) ![pcy](/content/u470037277766700/xxlarge1087.gif) ![icy](/content/u470037277766700/xxlarge1080.gif) ![rcy](/content/u470037277766700/xxlarge1088.gif) ![ocy](/content/u470037277766700/xxlarge1086.gif) ![vcy](/content/u470037277766700/xxlarge1074.gif) ![ocy](/content/u470037277766700/xxlarge1086.gif) ![ocy](/content/u470037277766700/xxlarge1086.gif) ![bcy](/content/u470037277766700/xxlarge1073.gif) ![scy](/content/u470037277766700/xxlarge1089.gif) ![ucy](/content/u470037277766700/xxlarge1091.gif) ![zhcy](/content/u470037277766700/xxlarge1078.gif) ![iecy](/content/u470037277766700/xxlarge1077.gif) ![ncy](/content/u470037277766700/xxlarge1085.gif) ![bcy](/content/u470037277766700/xxlarge1073.gif) ![ocy](/content/u470037277766700/xxlarge1086.gif) ![gcy](/content/u470037277766700/xxlarge1075.gif) ![acy](/content/u470037277766700/xxlarge1072.gif) ![tcy](/content/u470037277766700/xxlarge1090.gif) ![ycy](/content/u470037277766700/xxlarge1099.gif) ![scy](/content/u470037277766700/xxlarge1089.gif) ![tcy](/content/u470037277766700/xxlarge1090.gif) ![iecy](/content/u470037277766700/xxlarge1077.gif) ![kcy](/content/u470037277766700/xxlarge1082.gif) ![ocy](/content/u470037277766700/xxlarge1086.gif) .
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