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Title: Hydrothermal phase stability study of Li{sub 2}B{sub 4}O{sub 7}

Abstract

Growth of Li{sub 2}B{sub 4}O{sub 7} by the hydrothermal method was attempted in 10{sup −6} M LiOH, by both spontaneous nucleation and transport growth. Li{sub 2}B{sub 4}O{sub 7} grew out of the first spontaneous nucleation reaction, while the seed dissolved and γ-LiBO{sub 2} formed during the transport growth reactions. A species thermodynamic stability study showed that γ-LiBO{sub 2} formed exclusively from 350 °C to 550 °C, and Li{sub 3}B{sub 5}O{sub 8}(OH){sub 2} was observed at 250 °C; Li{sub 2}B{sub 4}O{sub 7} was not observed. A solubility study on Li{sub 2}B{sub 4}O{sub 7} did not achieve equilibrium conditions, but did demonstrate that γ-LiBO{sub 2} is significantly more thermodynamically stable than Li{sub 2}B{sub 4}O{sub 7} under the tested conditions. Formation of Li{sub 2}B{sub 4}O{sub 7} hydrothermally was shown to result from kinetic growth. - Graphical abstract: Every boron in lithium γ-metaborate is tetrahedrally coordinated with oxygen, and each tetrahedron is linked to four other tetrahedrons, creating a strong B-O lattice surrounding the lithium atoms. - Highlights: • Li{sub 2}B{sub 4}O{sub 7} was grown hydrothermally via spontaneous nucleation in 10{sup −6} M LiOH. • γ-LiBO{sub 2} formed from 350 °C to 550 °C and Li{sub 3}B{sub 5}O{sub 8}(OH){sub 2} was observed at 250more » °C. • A solubility study showed γ-LiBO{sub 2} to be more thermodynamically stable than Li{sub 2}B{sub 4}O{sub 7}. • Hydrothermal formation of Li{sub 2}B{sub 4}O{sub 7} was shown to result from kinetic growth.« less

Authors:
 [1];  [2];  [1];  [1]
  1. Department of Engineering Physics, Air Force Institute of Technology, 2950 Hobson Way, Wright-Patterson AFB, OH 45433-7765 (United States)
  2. Air Force Research Laboratory Sensors Directorate, 2241 Avionics Circle, Bldg 600, Wright-Patterson AFB, OH 45433-7765 (United States)
Publication Date:
OSTI Identifier:
22443374
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 216; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; BORATES; BORON; HYDROTHERMAL SYNTHESIS; LITHIUM; LITHIUM HYDROXIDES; NUCLEATION; OXYGEN; PHASE STABILITY; SOLUBILITY

Citation Formats

Graham, Jeffrey J., E-mail: jeffrey.graham@dtra.mil, Matthew Mann, J., E-mail: james.mann.11@us.af.mil, Zens, Timothy W.C., E-mail: timothy.zens@afit.edu, and McClory, John W., E-mail: john.mcclory@afit.edu. Hydrothermal phase stability study of Li{sub 2}B{sub 4}O{sub 7}. United States: N. p., 2014. Web. doi:10.1016/J.JSSC.2014.04.019.
Graham, Jeffrey J., E-mail: jeffrey.graham@dtra.mil, Matthew Mann, J., E-mail: james.mann.11@us.af.mil, Zens, Timothy W.C., E-mail: timothy.zens@afit.edu, & McClory, John W., E-mail: john.mcclory@afit.edu. Hydrothermal phase stability study of Li{sub 2}B{sub 4}O{sub 7}. United States. doi:10.1016/J.JSSC.2014.04.019.
Graham, Jeffrey J., E-mail: jeffrey.graham@dtra.mil, Matthew Mann, J., E-mail: james.mann.11@us.af.mil, Zens, Timothy W.C., E-mail: timothy.zens@afit.edu, and McClory, John W., E-mail: john.mcclory@afit.edu. Fri . "Hydrothermal phase stability study of Li{sub 2}B{sub 4}O{sub 7}". United States. doi:10.1016/J.JSSC.2014.04.019.
@article{osti_22443374,
title = {Hydrothermal phase stability study of Li{sub 2}B{sub 4}O{sub 7}},
author = {Graham, Jeffrey J., E-mail: jeffrey.graham@dtra.mil and Matthew Mann, J., E-mail: james.mann.11@us.af.mil and Zens, Timothy W.C., E-mail: timothy.zens@afit.edu and McClory, John W., E-mail: john.mcclory@afit.edu},
abstractNote = {Growth of Li{sub 2}B{sub 4}O{sub 7} by the hydrothermal method was attempted in 10{sup −6} M LiOH, by both spontaneous nucleation and transport growth. Li{sub 2}B{sub 4}O{sub 7} grew out of the first spontaneous nucleation reaction, while the seed dissolved and γ-LiBO{sub 2} formed during the transport growth reactions. A species thermodynamic stability study showed that γ-LiBO{sub 2} formed exclusively from 350 °C to 550 °C, and Li{sub 3}B{sub 5}O{sub 8}(OH){sub 2} was observed at 250 °C; Li{sub 2}B{sub 4}O{sub 7} was not observed. A solubility study on Li{sub 2}B{sub 4}O{sub 7} did not achieve equilibrium conditions, but did demonstrate that γ-LiBO{sub 2} is significantly more thermodynamically stable than Li{sub 2}B{sub 4}O{sub 7} under the tested conditions. Formation of Li{sub 2}B{sub 4}O{sub 7} hydrothermally was shown to result from kinetic growth. - Graphical abstract: Every boron in lithium γ-metaborate is tetrahedrally coordinated with oxygen, and each tetrahedron is linked to four other tetrahedrons, creating a strong B-O lattice surrounding the lithium atoms. - Highlights: • Li{sub 2}B{sub 4}O{sub 7} was grown hydrothermally via spontaneous nucleation in 10{sup −6} M LiOH. • γ-LiBO{sub 2} formed from 350 °C to 550 °C and Li{sub 3}B{sub 5}O{sub 8}(OH){sub 2} was observed at 250 °C. • A solubility study showed γ-LiBO{sub 2} to be more thermodynamically stable than Li{sub 2}B{sub 4}O{sub 7}. • Hydrothermal formation of Li{sub 2}B{sub 4}O{sub 7} was shown to result from kinetic growth.},
doi = {10.1016/J.JSSC.2014.04.019},
journal = {Journal of Solid State Chemistry},
number = ,
volume = 216,
place = {United States},
year = {Fri Aug 15 00:00:00 EDT 2014},
month = {Fri Aug 15 00:00:00 EDT 2014}
}