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Title: Processing of crack-free high density polycrystalline LiTaO3 ceramics

Abstract

Our work achieved high density (99.9%) polycrystalline LiTaO 3. The keys to the high density without cracking were the use of LiF-assisted densification to maintain fine grain size as well as the presence of secondary lithium aluminate phases as grain growth inhibitors. The average grain size of the hot pressed polycrystalline LiTaO 3 is less than 5 μm, limiting residual stresses caused by the anisotropic thermal expansion. Dilatometry results clearly indicate liquid phase sintering via the added LiF sintering aid. Efficient liquid phase sintering allows densification during low temperature hot pressing. Electron microscopy confirmed the high-density microstructure. Furthermore, Rietveld analysis of neutron diffraction data revealed the presence of LiAlO 2 and LiAl 5O 8 minority phases and negligible substitutional defect incorporation in LiTaO 3.

Authors:
ORCiD logo; ; ; ; ; ;
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1335607
Report Number(s):
LA-UR-15-28219
Journal ID: ISSN 0957-4522
Grant/Contract Number:  
AC52-06NA25396; AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Materials Science Materials in Electronics
Additional Journal Information:
Journal Volume: 28; Journal Issue: 4; Journal ID: ISSN 0957-4522
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; LiTaO3, polycrystalline, Ceramic.

Citation Formats

Chen, Ching-Fong, Brennecka, Geoff L., King, Graham, Tegtmeier, Eric L., Holesinger, Terry, Ivy, Jacob, and Yang, Pin. Processing of crack-free high density polycrystalline LiTaO3 ceramics. United States: N. p., 2016. Web. doi:10.1007/s10854-016-5980-5.
Chen, Ching-Fong, Brennecka, Geoff L., King, Graham, Tegtmeier, Eric L., Holesinger, Terry, Ivy, Jacob, & Yang, Pin. Processing of crack-free high density polycrystalline LiTaO3 ceramics. United States. doi:10.1007/s10854-016-5980-5.
Chen, Ching-Fong, Brennecka, Geoff L., King, Graham, Tegtmeier, Eric L., Holesinger, Terry, Ivy, Jacob, and Yang, Pin. Fri . "Processing of crack-free high density polycrystalline LiTaO3 ceramics". United States. doi:10.1007/s10854-016-5980-5. https://www.osti.gov/servlets/purl/1335607.
@article{osti_1335607,
title = {Processing of crack-free high density polycrystalline LiTaO3 ceramics},
author = {Chen, Ching-Fong and Brennecka, Geoff L. and King, Graham and Tegtmeier, Eric L. and Holesinger, Terry and Ivy, Jacob and Yang, Pin},
abstractNote = {Our work achieved high density (99.9%) polycrystalline LiTaO3. The keys to the high density without cracking were the use of LiF-assisted densification to maintain fine grain size as well as the presence of secondary lithium aluminate phases as grain growth inhibitors. The average grain size of the hot pressed polycrystalline LiTaO3 is less than 5 μm, limiting residual stresses caused by the anisotropic thermal expansion. Dilatometry results clearly indicate liquid phase sintering via the added LiF sintering aid. Efficient liquid phase sintering allows densification during low temperature hot pressing. Electron microscopy confirmed the high-density microstructure. Furthermore, Rietveld analysis of neutron diffraction data revealed the presence of LiAlO2 and LiAl5O8 minority phases and negligible substitutional defect incorporation in LiTaO3.},
doi = {10.1007/s10854-016-5980-5},
journal = {Journal of Materials Science Materials in Electronics},
number = 4,
volume = 28,
place = {United States},
year = {2016},
month = {11}
}

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