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Title: Flux growth utilizing the reaction between flux and crucible

Abstract

Flux growth involves dissolving the components of the target compound in an appropriate flux at high temperatures and then crystallizing under supersaturation controlled by cooling or evaporating the flux. A refractory crucible is generally used to contain the high temperature melt. Moreover, the reaction between the melt and crucible materials can modify the composition of the melt, which typically results in growth failure, or contaminates the crystals. Thus one principle in designing a flux growth is to select suitable flux and crucible materials thus to avoid any reaction between them. In this paper, we review two cases of flux growth in which the reaction between flux and Al 2O 3 crucible tunes the oxygen content in the melt and helps the crystallization of desired compositions. For the case of La 5Pb 3O, the Al 2O 3 crucible oxidizes La to form a passivating La 2O 3 layer which not only prevents further oxidization of La in the melt but also provides [O] to the melt. Finally, in the case of La 0.4Na 0.6Fe 2As 2, it is believed that the Al 2O 3 crucible reacts with NaAsO 2 and the reaction consumes oxygen in the melt thus maintaining an oxygen-freemore » environment.« less

Authors:
 [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1185841
Alternate Identifier(s):
OSTI ID: 1246403
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Crystal Growth
Additional Journal Information:
Journal Volume: 416; Journal Issue: C; Journal ID: ISSN 0022-0248
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; A2. Growth from high temperature solutions; B2. Superconducting materials; B1. Arsenates; A1. Solubility; A1. Diffusion

Citation Formats

Yan, J. -Q. Flux growth utilizing the reaction between flux and crucible. United States: N. p., 2015. Web. doi:10.1016/j.jcrysgro.2015.01.017.
Yan, J. -Q. Flux growth utilizing the reaction between flux and crucible. United States. doi:10.1016/j.jcrysgro.2015.01.017.
Yan, J. -Q. Thu . "Flux growth utilizing the reaction between flux and crucible". United States. doi:10.1016/j.jcrysgro.2015.01.017. https://www.osti.gov/servlets/purl/1185841.
@article{osti_1185841,
title = {Flux growth utilizing the reaction between flux and crucible},
author = {Yan, J. -Q.},
abstractNote = {Flux growth involves dissolving the components of the target compound in an appropriate flux at high temperatures and then crystallizing under supersaturation controlled by cooling or evaporating the flux. A refractory crucible is generally used to contain the high temperature melt. Moreover, the reaction between the melt and crucible materials can modify the composition of the melt, which typically results in growth failure, or contaminates the crystals. Thus one principle in designing a flux growth is to select suitable flux and crucible materials thus to avoid any reaction between them. In this paper, we review two cases of flux growth in which the reaction between flux and Al2O3 crucible tunes the oxygen content in the melt and helps the crystallization of desired compositions. For the case of La5Pb3O, the Al2O3 crucible oxidizes La to form a passivating La2O3 layer which not only prevents further oxidization of La in the melt but also provides [O] to the melt. Finally, in the case of La0.4Na0.6Fe2As2, it is believed that the Al2O3 crucible reacts with NaAsO2 and the reaction consumes oxygen in the melt thus maintaining an oxygen-free environment.},
doi = {10.1016/j.jcrysgro.2015.01.017},
journal = {Journal of Crystal Growth},
number = C,
volume = 416,
place = {United States},
year = {Thu Jan 22 00:00:00 EST 2015},
month = {Thu Jan 22 00:00:00 EST 2015}
}

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