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Title: Chloride influence on the formation of lanthanum hexaboride: An in-situ diffraction study

Abstract

LaB 6 has been a material of interest for decades due to its thermionic emission, plasmonic properties, and low work function, and researchers continue to discover new properties even now. In order to meet growing interest in customizing these properties, it is important to gain better control over the system and a better understanding of the fundamental mechanism of LaB 6 crystal growth and formation. Traditional synthetic methods require very high temperatures, at which point crystallization happens too quickly to be readily studied. Our discovery that LaB 6 may be made using lower temperatures has made it possible to slow down crystal formation enough for lattice growth to be observed. Here, we report an in situ diffraction study of the reaction between LaCl 3 and NaBH 4 . In observing the evolution of the (1 1 1), (1 1 0), and (2 0 0) lattice planes of LaB 6, we have discovered that the Cl of LaCl3 has a strong influence on crystal formation, and that excess Cl, temperature and heating rate may all be used as tools to control the LaB 6 final product.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), Workforce Development for Teachers and Scientists (WDTS) (SC-27)
OSTI Identifier:
1630948
Alternate Identifier(s):
OSTI ID: 1434032
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Published Article
Journal Name:
Journal of Crystal Growth
Additional Journal Information:
Journal Name: Journal of Crystal Growth Journal Volume: 486 Journal Issue: C; Journal ID: ISSN 0022-0248
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; A1. X-ray diffraction; B1. Nanostructures; B1. Halides; B1. Inorganic compounds; B1. Hexaborides

Citation Formats

Mattox, Tracy M., Groome, Chloe, Doran, Andrew, Beavers, Christine M., and Urban, Jeffrey J. Chloride influence on the formation of lanthanum hexaboride: An in-situ diffraction study. Netherlands: N. p., 2018. Web. doi:10.1016/j.jcrysgro.2018.01.013.
Mattox, Tracy M., Groome, Chloe, Doran, Andrew, Beavers, Christine M., & Urban, Jeffrey J. Chloride influence on the formation of lanthanum hexaboride: An in-situ diffraction study. Netherlands. doi:10.1016/j.jcrysgro.2018.01.013.
Mattox, Tracy M., Groome, Chloe, Doran, Andrew, Beavers, Christine M., and Urban, Jeffrey J. Thu . "Chloride influence on the formation of lanthanum hexaboride: An in-situ diffraction study". Netherlands. doi:10.1016/j.jcrysgro.2018.01.013.
@article{osti_1630948,
title = {Chloride influence on the formation of lanthanum hexaboride: An in-situ diffraction study},
author = {Mattox, Tracy M. and Groome, Chloe and Doran, Andrew and Beavers, Christine M. and Urban, Jeffrey J.},
abstractNote = {LaB6 has been a material of interest for decades due to its thermionic emission, plasmonic properties, and low work function, and researchers continue to discover new properties even now. In order to meet growing interest in customizing these properties, it is important to gain better control over the system and a better understanding of the fundamental mechanism of LaB6 crystal growth and formation. Traditional synthetic methods require very high temperatures, at which point crystallization happens too quickly to be readily studied. Our discovery that LaB6 may be made using lower temperatures has made it possible to slow down crystal formation enough for lattice growth to be observed. Here, we report an in situ diffraction study of the reaction between LaCl3 and NaBH4 . In observing the evolution of the (1 1 1), (1 1 0), and (2 0 0) lattice planes of LaB6, we have discovered that the Cl of LaCl3 has a strong influence on crystal formation, and that excess Cl, temperature and heating rate may all be used as tools to control the LaB6 final product.},
doi = {10.1016/j.jcrysgro.2018.01.013},
journal = {Journal of Crystal Growth},
number = C,
volume = 486,
place = {Netherlands},
year = {2018},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1016/j.jcrysgro.2018.01.013

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