“…The melting point of ZnO·B 2 O 3 is 982 • C and 5ZnO·2B 2 O 3 melts incongruently at 1045 • C [5]. However, six other compounds were reported with the ZnO:B 2 O 3 molar ratios of 4:1 [6], 3:1 [7-9], 4:3 [10][11][12], 1:1 [13], 1:2 [14,15] and 1:3 [16]. The 4:1 compound was obtained by hydrothermal method.…”