Organic-inorganic hybrid perovskite materials have been receiving considerable attention due to their promising applications in many optoelectronic fields. However, some of the fundamental properties of perovskite materials are still disputed, because most of them are derived from a thin-film state. To comprehend the intrinsic characteristics in a single crystal, herein we report, for the first time, the bulk crystal growth of CH 3 NH 3 PbI 3 . Single crystals of tetragonal CH 3 NH 3 PbI 3 with dimensions of 10 mm × 10 mm × 8 mm were grown by a temperature-lowering method in HI solution. Studies in to the refinement and orientations of the CH 3 NH 3 PbI 3 single crystal structure were conducted based on a high quality crystal.The absorption edge of a CH 3 NH 3 PbI 3 single crystal was located at about 836 nm, indicating that the band gap of CH 3 NH 3 PbI 3 is approximately 1.48 eV, which is close to the theoretical results and smaller than those derived from polycrystalline and thin-films. CH 3 NH 3 PbI 3 crystal exhibits a relatively wide absorption (from 250 nm to 800 nm) and a relatively good thermal stability. CrystEngCommThis journal is † Electronic supplementary information (ESI) available. CCDC 1029776; the images of white MAI, white with yellow MAI and residue light yellow PbI 2 ; powder X-ray diffraction patterns for MAI; 1 H-NMR and 13 C-NMR spectra of MAI; selected bond lengthIJÅ) and bond anglesIJdeg) for β-MAPbI 3 , isotropic and anisotropic displacement parameters of MAPbI 3 . See

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Supporting Information. X-ray crystallographic file in CIF format for the Cs 2 TeMo 3 O 12 single crystal. This material is available free of charge via the Internet at http://pubs.acs.org.

α-BaTeMo(2)O(9) is a novel biaxial crystal with wide-band transmittance spectrum. The refractive index dispersion curves and birefringence of the α-BaTeMo(2)O(9) crystal were obtained in spectral range of 0.4~5 μm. The origin of the birefringence for the crystal has been calculated and interpreted on the basis of the crystal structure combined with theoretical studies. The polarized directions and formulations of refractive index of optical waves in biaxial α-BaTeMo(2)O(9) were investigated by solving the refractive index ellipsoid equations. Furthermore, polarized prisms based on the α-BaTeMo(2)O(9) crystal used in spectral ranges of 0.4~2.7 μm and 0.48~4.5 μm were designed and characterized. The extinction ratios of both prisms were determined to be larger than 10000:1, which would satisfy the practical requirements. The impacts on extinction ratio for biaxial and uniaxial crystals were also discussed. To our knowledge, it is the first report about biaxial crystals for the polarized prisms, and the results show that the α-BaTeMo(2)O(9) crystal is a promising material for polarized optical components, especially in the range of 3~5 μm.