TY - JOUR
T1 - Chloride Flux Growth of Idiomorphic AWO4 (A = Sr, Ba) Single Microcrystals
AU - Kawashima, Kenta
AU - Kim, Jun Hyuk
AU - Cheng, Isabelle
AU - Yubuta, Kunio
AU - Shin, Kihyun
AU - Liu, Yang
AU - Lin, Jie
AU - Henkelman, Graeme
AU - Mullins, C. Buddie
N1 - Funding Information:
The authors gratefully acknowledge the U.S. Department of Energy Basic Energy Sciences Grant DE-FG02-09ER16119 (C.B.M.) for support of the experimental portion of the paper and DE-SC0010576 (G.H.) for the computational portion of the study. We also acknowledge the Welch Foundation for their generous support through grants F-1436 (C.B.M) and F-1841 (G.H.).
Publisher Copyright:
© Copyright 2018 American Chemical Society.
PY - 2018/9/5
Y1 - 2018/9/5
N2 - Scheelite-type divalent metal tungstate materials (AWO4) have been studied for various applications due to their attractive mechanical and chemical properties. Preparation of the shape-controlled AWO4 crystals with high crystallinity is one of the most effective approaches for further exploring and improving their properties. In this study, highly crystalline SrWO4 and BaWO4 microcrystals with different morphologies were grown by using a chloride flux growth technique. To investigate the effect of growth conditions on SrWO4 and BaWO4 crystals, NaCl and KCl were used as a flux, and the solute concentration was adjusted in the range of 5-50 mol %. The difference in the flux cation species (Na+ and K+) mainly affected the crystal size. In accordance with increasing the solute concentration, the dominant crystal shape of SrWO4 and BaWO4 varied as follows: whisker (a rod- or wire-like morphology with a large aspect ratio) → platelet → well/less-faceted polyhedron. Additionally, according to scanning electron microscopy and transmission electron microscopy results, a dendritic morphological transformation from AWO4 whisker to platelet during crystal growth has been proposed.
AB - Scheelite-type divalent metal tungstate materials (AWO4) have been studied for various applications due to their attractive mechanical and chemical properties. Preparation of the shape-controlled AWO4 crystals with high crystallinity is one of the most effective approaches for further exploring and improving their properties. In this study, highly crystalline SrWO4 and BaWO4 microcrystals with different morphologies were grown by using a chloride flux growth technique. To investigate the effect of growth conditions on SrWO4 and BaWO4 crystals, NaCl and KCl were used as a flux, and the solute concentration was adjusted in the range of 5-50 mol %. The difference in the flux cation species (Na+ and K+) mainly affected the crystal size. In accordance with increasing the solute concentration, the dominant crystal shape of SrWO4 and BaWO4 varied as follows: whisker (a rod- or wire-like morphology with a large aspect ratio) → platelet → well/less-faceted polyhedron. Additionally, according to scanning electron microscopy and transmission electron microscopy results, a dendritic morphological transformation from AWO4 whisker to platelet during crystal growth has been proposed.
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U2 - 10.1021/acs.cgd.8b00757
DO - 10.1021/acs.cgd.8b00757
M3 - Article
AN - SCOPUS:85050723034
SN - 1528-7483
VL - 18
SP - 5301
EP - 5310
JO - Crystal Growth and Design
JF - Crystal Growth and Design
IS - 9
ER -