Date of Award
Master of Science
Department of Engineering Physics
Timothy W. Zens, PhD.
Growth of lithium tetraborate by the hydrothermal method was attempted in 10^-6 M LiOH, both by spontaneous nucleation and transport growth. Tetraborate grew out of the first spontaneous nucleation reaction, while the seed dissolved and lithium gamma-metaborate formed during the transport growth reactions. A species thermodynamic stability study showed gamma-metaborate formed exclusively from 350 deg C to 550 deg C, and Li3B5O8(OH)2 was observed at 250 deg C; tetraborate was not observed. A solubility study on lithium tetraborate did not achieve equilibrium conditions, but did demonstrate that gamma-metaborate is significantly more thermodynamically stable than tetraborate under the tested conditions. Formation of lithium tetraborate hydrothermally was shown to result from kinetic growth.
DTIC Accession Number
Graham, Jeffrey J., "Hydrothermal Crystal Growth of Lithium Tetraborate and Lithium y-Metaborate" (2014). Theses and Dissertations. 648.