Single Crystal Growth And Optical Properties Of A Transparent Perovskite Oxide Laino3

Transparent LaInO3 single crystals have been grown using the optical floating zone method. Optimal growth, resulting in the highest optical transparency and best crystallinity, has been found at a growth speed of 15 mm/h and an O-2 gas pressure of 10 bar. Under these conditions, single crystals as large as similar to 4 x 4 mm 2 have been obtained. Chemical compositions and structural analyses reveal that the resulting LaInO3 single crystal is stoichiometric without any impurity phase and forms an orthorhombic perovskite structure. Optical transmission spectra exhibit multiple optical transitions in a wide spectral range (0.5-4.2 eV). Although the main optical absorption occurs at similar to 4.13 eV, weak absorption starts to develop from similar to 1.4 eV, in agreement with an activation energy of similar to 0.7 eV derived from electrical resistivity measurements. The dielectric constant epsilon is found to be 23.7 at room temperature. This LaInO3 single crystal can be used as a transparent perovskite substrate for growing oxide semiconductors with lattice constants close to similar to 4.12 angstrom, such as doped BaSnO3. Published by AIP Publishing.