Cubic phase sodium potassium tantalateniobate crystal and preparation thereof

Abstract

A cubic phase potassium sodium tantalum niobate crystal and a preparation method thereof relate to the potassium sodium tantalum niobate crystal and the preparation method thereof, which solve the problems that the existing potassium sodium tantalum niobate crystal products crack easily, and the paraelectric (cubic) phase potassium sodium tantalum niobate crystal has low optical quality, high sintering temperature, long time consumption, low yield and high cost. The chemical formula of the cubic phase potassium sodium tantalum niobate crystal is K1-yNayTa1-xNbxO3 or M:K1-yNayTa1-xNbxO3. The method comprises the following steps: (1) raw materials are weighed; (2) a potassium sodium tantalum niobate polycrystal is prepared; (3) the potassium sodium tantalum niobate polycrystal is cooled and seeded; (4) the cubic phase potassium sodium tantalum niobate crystal is obtained by a top seeded crystal flux method. The top seeded crystal flux method is utilized to realize the preparation of the cubic phase potassium sodium tantalum niobate crystal for the first time. The obtained product has the advantages of no crack, no stripe growth, high optical quality, even crystal components, and that the crystal has good optical property and good mechanical property. The preparation method has the advantages of simple process, short time consumption, low sintering temperature and low cost.

Description

technical field [0001] The invention relates to a potassium sodium tantalum niobate crystal and a preparation method thereof. Background technique [0002] Photorefractive materials are widely used in the fields of optical storage, optical amplification, optical communication, optical computing, optical information processing, optical computer and optical neural network. Cubic phase (paraelectric phase) photorefractive crystals have become a research hotspot in this field because of their excellent electro-optic and electronically controlled photorefractive properties. Compared with the electro-optic and photorefractive crystals in the ferroelectric phase, the paraelectric phase (cubic phase) crystal has the following unique properties: first, its secondary electro-optic effect (Kerr effect) is very significant when it is near the Curie temperature. Under the action of an external electric field, the refractive index of the crystal can change by up to 10 -2 . Second, para...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a cubic phase in order to solve the problems that existing potassium tantalum niobate crystal products are easy to crack, and the paraelectric (cubic) pha

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