First electrochemical growth of Tb{sub 16}O{sub 30} single crystal

Journal Article · Fri Oct 01 04:00:00 EDT 2004 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2004.07.015· OSTI ID:20653405

Imanaka, Nobuhito ^[1]; Masui, Toshiyuki ^[1]; Kim, Woon Young ^[1]

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1. Department of Applied Chemistry, Faculty of Engineering, Handai Frontier Research Center, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871 (Japan)

Single crystals of Tb{sub 16}O{sub 30} (TbO{sub 1.875}) were successfully grown for the first time by DC electrolysis of the Tb{sup 3+} ion conducting Tb{sub 2}(MoO{sub 4}){sub 3} solid electrolyte at 11V, 900{sup o}C. The Tb{sub 16}O{sub 30} phase is the intermediate phase of fluorite-related rare earth oxides and it is extremely difficult to grow in a single crystal form, because this intermediate phase is usually obtained as one of the mixture of the fluorite related TbO{sub x} phases. Because there are many non-stoichiometric phases in the terbium oxide system, it is impossible to grow a specific intermediate phase in a single crystal form by the conventional methods via melt. Although single crystals of TbO{sub x} have been recently obtained by anodic electrocrystallization from alkaline hydroxide melts containing TbCl{sub 3}, the composition has been confirmed to be TbO{sub x} with 1.75x1.82. On the contrary, the presently developed DC electrolysis method can be simply applicable at moderate temperatures around 900{sup o}C to artificially grow an intermediate phase of Tb{sub 16}O{sub 30} (x=1.875) in a single crystal form, which was evidenced by the electron diffraction patterns for each particle.

• OSTI ID: 20653405
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 10 Vol. 177; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRYSTAL GROWTH
ELECTROLYSIS
ELECTRON DIFFRACTION
FLUORITE
MOLYBDATES
MONOCRYSTALS
SOLID ELECTROLYTES
STOICHIOMETRY
TEMPERATURE RANGE 0400-1000 K
TERBIUM CHLORIDES
TERBIUM IONS
TERBIUM OXIDES