Abstract
Growth of Li2B4O7 by the hydrothermal method was attempted in 10−6MLiOH, by both spontaneous nucleation and transport growth. Li2B4O7 grew out of the first spontaneous nucleation reaction, while the seed dissolved and γ-LiBO2 formed during the transport growth reactions. A species thermodynamic stability study showed that γ-LiBO2 formed exclusively from 350°C to 550°C, and Li3B5O8(OH)2 was observed at 250°C; Li2B4O7 was not observed. A solubility study on Li2B4O7 did not achieve equilibrium conditions, but did demonstrate that γ-LiBO2 is significantly more thermodynamically stable than Li2B4O7 under the tested conditions. Formation of Li2B4O7 hydrothermally was shown to result from kinetic growth.
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