Structural, dielectric and optical properties of barium strontium sodium niobate (Sr0.7Ba0.3)2NaNb5O15 single crystals
نویسندگان
چکیده
Barium strontium sodium niobate (Sr0.7Ba0.3)2NaNb5O15 (SBNN70) crystals were grown by the Czochralski method. X-ray energy dispersive spectrometry showed that SBNN70 crystals have a stoichiometric composition nearly identical to the starting materials. X-ray diffraction of crushed powder indicated that the SBNN70 crystals are orthorhombic with a = 1.2748 nm, b = 1.1402 nm and c = 0.3898 nm. The measured temperature dependence of dielectric constants showed strongly anisotropic relaxor behaviour. The Curie temperature of the SBNN70 crystals is 186.7 ̊C, which is 116 ̊C higher than that of the (SrxBa1−x)5Nb10O30 (SBN) crystal. The transmissivity and refractive index of [001] oriented SBNN70 single crystals were measured, and a deep energy level of 3.54 eV was found. The SBNN70 crystal has better than 70% optical transmittance for wavelengths above 500 nm. The refractive index of SBNN70 is 2.004 at 632.8 nm, which is lower than 2.3117 for SBN crystals.
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