Abstract
Today, one of the most promising materials for a wide range of practical applications is lithium-containing ceramics based on Li2TiO3. At the same time, despite the high potential of their practical application, a number of questions remains related to the methods of their preparation, as well as the formation of a stable crystal structure and a pure-phase composition. To solve these issues, this paper proposes a method for obtaining stable Li2TiO3 ceramics, which is based on solid-phase synthesis combined with the high-temperature sintering of ceramics. During the studies carried out using X-ray diffraction methods, temperature dependences of phase transformations of the TiO2/Li2Ti6O13 → Li2TiO3 type were determined, according to which, at temperatures above 800 °C, the formation of a stable Li2TiO3 phase characterized by a high structural ordering degree of 89–91% is observed. The dependence of changes in structural, optical and ferroelectric characteristics on the conditions of synthesis and phase composition of ceramics was also determined.
Highlights
Lithium-containing ceramics such as Li2 TiO3, LiAlO2, Li2 ZrO3, Li4 SiO4 due to their unique physicochemical properties, as well as high resistance to chemical corrosion and mechanical stress, are widely used as a basis for ferroelectric devices, and as materials for tritium propagation in thermonuclear power [1,2,3,4,5]
The aim of this work is to study phase transformations and the subsequent formation of a stable-phase composition of lithium-containing ceramics obtained using the method of solid-phase high-temperature synthesis
An insignificant increase in the contribution of the Li2 Ti6 O13 phase to the structure of ceramics is observed, which is due to the processes of phase transformations and orderings
Summary
Lithium-containing ceramics such as Li2 TiO3 , LiAlO2 , Li2 ZrO3 , Li4 SiO4 due to their unique physicochemical properties, as well as high resistance to chemical corrosion and mechanical stress, are widely used as a basis for ferroelectric devices, and as materials for tritium propagation in thermonuclear power [1,2,3,4,5] Great interest in these types of ceramics, in particular methods of their production, is due to the high yield of tritium, as well as the ability to control the morphological and structural features of ceramics [6,7]. Both in the case of this method and in a number of other works, little attention is paid to the transition states of ceramics, which can have a significant effect on the further evolution of structural properties [18,19,20]
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