Sodium bismuth titanate-barium titanate lead-free transparent electro-optic ceramic and preparation method thereof

A technology of sodium bismuth titanate and electro-optical ceramics is applied in the field of sodium bismuth titanate-barium titanate lead-free transparent electro-optical ceramics and its preparation, which can solve the problems of opacity of ceramics, difficult to control volatilization, long sintering time, etc., and achieve inhibition and elimination Air holes, high electro-optic coefficient, the effect of suppressing the generation of impurity
CN104744033AActive Publication Date: 2015-07-01中国科学院上海硅酸盐研究所苏州研究院
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
中国科学院上海硅酸盐研究所苏州研究院
Publication Date
2015-07-01

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Abstract

The invention relates to a sodium bismuth titanate-barium titanate lead-free transparent electro-optic ceramic and a preparation method thereof; the electro-optic ceramic has the chemical composition of (1-x)(Na0.5Bi0.5)TiO3-xBaTiO3, wherein 0.05<=x<=0.08; the preparation method includes the steps: batching Na2CO3, Bi2O3, TiO2 and BaCO3 as raw materials according to the stoichiometric ratio, carrying out ball milling, and mixing evenly to obtain a powder; carrying out heat preservation on the powder for 2-4 h at the temperature of 850-950 DEG C, and thus obtaining a synthetic material; crushing the synthetic material, sieving, carrying out ball milling, adding a binder, and carrying out press molding to obtain a blank; next, placing the blank in a sintering furnace, heating up from room temperature to 800 DEG C-850 DEG C at the speed of 200 DEG C-250 DEG C / h, and carrying out heat preservation for 0.5-1.5 h; and heating up at the speed of 100 DEG C / h and gradually pressurizing to 200-250 MPa, followed by keeping the pressure unchanged, heating up to 1000 DEG C-1050 DEG C, then carrying out heat preservation for 2 h, then heating up to 1100 DEG C-1200 DEG C at the speed of 50 DEG C / h, carrying out heat and pressure preservation for 8-24 h, then releasing the pressure, cooling to 900 DEG C at the speed of 100 DEG C / h, and cooling to room temperature along with a furnace, wherein oxygen is introduced with the flow quantity of 3-5 L / minute when the heating is started and introduction of oxygen is stopped when the pressure is released.
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Description

technical field

[0001] The invention belongs to the field of transparent functional ceramic materials, in particular to a bismuth sodium titanate-barium titanate lead-free transparent electro-optic ceramic and a preparation method thereof. Background technique

[0002] The development of optical communication is closely related to optical passive devices (optical switches, optical attenuators, optical couplers), and the quality of optical passive devices depends largely on the materials used to prepare optical passive devices. At present, the electro-optic material widely used in optical passive devices at home and abroad is lithium niobate single crystal material. This kind of crystal with perovskite structure has strong primary electro-optic effect, high Curie temperature and high response speed. However, due to the lack of breakthrough in growth technology for a long time, it is still difficult to grow lithium niobate crystals that meet the stoichiometric ratio, making it...

Claims

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