Abstract
Li 2TiO 3, one of the promising candidates for tritium breeding in a thermonuclear fusion reactor, has been investigated by X-ray diffraction at high temperatures. It was found that the crystal system of Li 2TiO 3 is monoclinic at 30–900 °C with a higher order structural phase transition at about 450 °C, showing agreement with dependence of thermal conductivity on temperature. This phase transition involved variation of the thermal expansion coefficient, which could also be observed by dilatometry.
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