Study of the boron-oxygen units in crystalline and molten barium metaborate by high temperature Raman spectroscopy

Role of non-stoichiometry in the cracking of oxide crystals

“…As borne out by the DTA measurements shown in Fig. 1, CWO melt undergoes large super-cooling of 1601 prior to solidification, indicating that the melt microstructure must be very different from its crystalline phase [13,14]. Consequently, the evaporative losses taking place in the molten state would be governed by the species present and not of the CWO phase thereby causing a shift in the material composition from its original value.…”

Investigations on the solidification behavior of Li2B4O7

“…For example, CsBO 2 melt is found to solidify 5-101 below the melting point. In this case the presence of (B 3 O 6 ) rings, which are the building blocks, has been confirmed and the number of broken rings is found to be negligible [14]. Also, the investigations in literature confirm the existence of a local ordering in LiNbO 3 melt that is similar to the crystal [15,16].…”

Growth and characterization of KY(WO4)2 crystals

“…It has been shown that the amount of supercooling required is determined by the presence/absence of the growth units in the growth medium [15]. For example, the CsBO 2 melt is observed to crystallize 5-101 below the melting point and here the presence of (B 3 O 6 ) rings that are the building blocks of its crystal structure has been confirmed in the melt [16]. In contrast, in BaB 2 O 4 melt the chains of various lengths and not the (B 3 O 6 ) rings that are the building blocks of its crystal structure are found to be the dominant units [17].…”