Spectroellipsometric study of sol–gel derived potassium sodium strontium barium niobate films

SBN60, strontium-barium niobate at 100 K

The title compound, Sr0.6Ba0.4Nb2O6 (strontium barium niobium oxide), belongs to the group of strontium-barium niobates with varying composition of Sr and Ba. Their general formula can be written as Sr x Ba1 - x Nb2O6. Below the Curie temperature, T c , these materials indicate ferroelectric properties. The Curie temperature for SBN60 is equal to 346±0.5 K so the structure is in the ferroelectr...

Environmental Friendly Potassium Sodium Niobate Based Thin Films from Solutions

We present the synthesis of ~250 nm thick K0.5Na0.5NbO3 thin films on platinized silicon substrates from alkoxide-based solutions with the stoichiometric composition and with the 5 or 10 mole % potassium acetate excess. The films crystallized into a pure perovskite phase, but depending on the amount of the alkali excess in solutions, they consisted of ~50 nm or of ~200 nm large grains. The fine...

Structural, dielectric and optical properties of barium strontium sodium niobate (Sr0.7Ba0.3)2NaNb5O15 single crystals

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...

Strontium Barium Niobate Thin Films for Dielectric and Electro-Optic Applications

Electrical fixing of waveguide channels in strontium-barium niobate crystals

We demonstrate a new method of electrical fixing of waveguiding channels in strontium-barium niobate. The method is applicable to both bulk material and planar SBN waveguides. Waveguiding is achieved for extraordinarily polarized light. We suggest that the fixing is based on a partial depoling of the crystal rather than on internal electric fields.