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X(ZY) Raman spectra of congruent (C) and stoichiometric (S) LT single crystals, congruent (C) and nearly stoichiometric(NS) LN single crystals, and LN and LT films on C- sapphire substrates.
Temperature evolution of normalized lattice parameters, L/L0 (with the respect to their values at ambient conditions) of a LT/Sapphire film and LT single crystal (a), and of a LN/Sapphire film and LN single crystal (b). LN and LT single crystals had congruent composition of Li2O. The Tc is indicated by dashed lines. The thermal expansion of normalized a-lattice parameter of sapphire is given for comparison (c).
Comparison of the thermal expansion (in °C−1) at 300 °C along the a- and c-axis of congruent LT/LN single crystals, LN/LT thin films, and sapphire substrate. The precision of the thermal expansion is 0.3 × 10−6 °C−1. The expected thermal expansion along c-axis of in-plane strained films, according to Eq. (1).
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