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Materials 2018, 11(6), 987; https://doi.org/10.3390/ma11060987

Rapid Sintering of Li2O-Nb2O5-TiO2 Solid Solution by Air Pressure Control and Clarification of Its Mechanism

1
Cooperative Research Facility Center, Toyohashi University of Technology, Toyohashi 441-8580, Aichi, Japan
2
Department of Environmental and Life Sciences, Toyohashi University of Technology, Toyohashi 441-8580, Aichi, Japan
3
Department of Materials Design Innovation Engineering, Nagoya University, Nagoya 464-8603, Aichi, Japan
4
FULL-TECH FURNACE Co., Ltd., Yao 581-0037, Osaka, Japan
*
Author to whom correspondence should be addressed.
Received: 24 April 2018 / Revised: 25 May 2018 / Accepted: 9 June 2018 / Published: 11 June 2018
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Abstract

We first successfully synthesized Li1+xyNb1−x−3yTix+4yO3 (LNT) solid solutions (0.13 ≤ x ≤ 0.18, 0 ≤ y ≤ 0.06) rapidly at 1373 K for one hour under 0.35 MPa by the controlling of air pressure using an air-pressure control atmosphere furnace. The composition is a formation area of a superstructure for LNT, in which the periodical intergrowth layer was formed in the matrix, and where it can be controlled by Ti content. Therefore, the sintering time depended on Ti content, and annealing was repeated for over 24 h until a homogeneous structure was formed using a conventional electric furnace. We clarified the mechanism of the rapid sintering using various microscale to nanoscale characterization techniques: X-ray diffraction, a scanning electron microscope, a transmission electron microscope (TEM), a Cs-corrected scanning TEM equipped with electron energy-loss spectroscopy, and X-ray absorption fine structure spectroscopy. View Full-Text
Keywords: oxide materials; rapid sintering; crystal structure; X-ray diffraction; TEM; HAADF-STEM oxide materials; rapid sintering; crystal structure; X-ray diffraction; TEM; HAADF-STEM
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Nakano, H.; Kamimoto, K.; Yamamoto, T.; Furuta, Y. Rapid Sintering of Li2O-Nb2O5-TiO2 Solid Solution by Air Pressure Control and Clarification of Its Mechanism. Materials 2018, 11, 987.

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