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

We first successfully synthesized Li Nb Ti O₃ (LNT) solid solutions (0.13 ≤ ≤ 0.18, 0 ≤ ≤ 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...

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Bibliographic Details
Published in:Materials 2018-06, Vol.11 (6), p.987
Main Authors: Nakano, Hiromi, Kamimoto, Konatsu, Yamamoto, Takahisa, Furuta, Yoshio
Format: Article
Language:English
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Summary:We first successfully synthesized Li Nb Ti O₃ (LNT) solid solutions (0.13 ≤ ≤ 0.18, 0 ≤ ≤ 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.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma11060987