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Binary borate and polytitanates compounds have currently been of considerable interest to the scientific community due to unique properties of barium titanate, barium polytitanates [Kong, 2010; Wakino, 1990], betta barium borate[Chen, C. & Liu, 1986] and recently revealed high negative thermal expansion of crystallized barium di-borate glass samples [Hovhannisyan, 2006]. It has also been revealed recently, that the single crystal of barium di-tanate is high-temperature ferroelectric with Curie temperature equal to 450-500°C [Waghmare et al., 2004; Akishige et al., 2006]. Park with co-authors reported a new barium titanium oxoborate crystal of Ba3Ti3O6(BO3)2 and found out that the second harmonic generation (SHG) efficiency of this crystal is equal to 95% of the well known LiNbO3 [Park et al., 2004]. These data have even strengthened the interest of studying the ternary BaOTiO2-B2O3 system even more. Binary BaO-TiO2 and BaO-B2O3 systems are investigated rather in detail by various authors. The following eight binary barium titanates known in the BaO-TiO2 system are: Ba2TiO4 (2BaT), BaTiO3 (BaT), BaTi2O5 (Ba2T), Ba6Ti17O40 (6Ba17T), Ba4Ti13O30 (4Ba13T), BaTi4O9(Ba4T), Ba2Ti9O20(2Ba9T) and BaTi5O11 (Ba5T) [Rase & Roy, 1955; O’Bryan & Thomson, 1974]. Levin with co-authors have studied the BaO-B2O3 system and constructed its melting diagram. They discovered four Ba3B2O6 (3BaB), BaB2O4 (BaB), BaB4O7(Ba2B) and BaB8O13 (Ba4B) compounds [Levin & McMurdie, 1949; Levin & Ugrinic, 1953]. Hubner synthesized three new Ba4B2O6 (4BaB), Ba2B2O5(2BaB) and Ba2B10O17 (2Ba5B) compounds [Hubner, 1969]. However, these compounds are not visible on the BaO-B2O3 systems diagram constructed earlier by Levin with co-authors [Levin & McMurdie, 1949; Levin & Ugrinic, 1953]. Pavlikov with co-authors have studied the TiO2-B2O3 system and didn’t reveal binary compounds in it [Pavlikov et al., 1976]. Simple eutectic which is very close to B2O3 (~2.9 mol% TiO2) was found and the presence of liquid immiscibility is supposed in the field of compositions containing 25-55 mol% of TiO2 [Pavlikov et al., 1976]. One binary oxygen containing titanium boron compoundtitanium borate, synthesized by Schmid is known now [Schmid, 1964]. Also the formation of TiBO3 was revealed during interaction between borate glass melts and titanium alloy [Brow & Watkins, 1987].

Phase Diagramm, Cristallization Behavior and Ferroelectric Properties of Stoichiometric Glass Ceramics in the BaO-TiO2-B2O3 System