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Method for growing CaxBa1-xNb2O6 series crystals

A caxba1-xnb2o6, crystal technology, applied in the field of CaxBa1-xNb2O6 series crystal growth, can solve the problems of limited application, easy depolarization, low ferroelectric phase transition temperature, etc., to simplify the process, fast growth, eliminate potential The effect of pollution

Inactive Publication Date: 2012-02-22
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The ferroelectric phase transition temperature of the strontium barium niobate crystal with TTB structure that has been widely studied is relatively low (varies with the composition, between 25 and 120 °C), and it is easy to depolarize, which greatly limits its performance at higher temperatures. Wide application under

Method used

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  • Method for growing CaxBa1-xNb2O6 series crystals
  • Method for growing CaxBa1-xNb2O6 series crystals

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Experimental program
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Effect test

Embodiment 1

[0034] (1) The crystal growth furnace used in the present invention is the FZ-T-10000-VI-VPO-PC optical floating zone method single crystal growth furnace produced by Japan Crystal Systems Corporation, and what grows is Ca 0.22 Ba 0.78 Nb 2 o 6 crystals.

[0035] Powder CaCO 3 (99.99%), BaCO 3 (99.95%) and Nb 2 o 5 (99.9985%) by Ca 0.22 Ba 0.78 Nb 2 o 6 Stoichiometric ratio was weighed, placed in a ZrO 2 In the nylon tank of the grinding medium, use absolute ethanol as the dispersant for ball milling, drying, and then put the powder into Al 2 o 3 In the crucible, it was pre-fired at 1200°C for 12 hours with a silicon-molybdenum furnace, crushed and sieved with 80 mesh, ball milled, dried, and sieved with 200 mesh. to obtain pure phase Ca 0.22 Ba 0.78 Nb 2 o 6 Powder.

[0036] (2) Put the powder obtained in step (1) into a long strip of rubber balloon, compact and seal, vacuumize, and make a biscuit rod with uniform thickness and density under 65MPa isostatic ...

Embodiment 2

[0041] (1) The crystal growth furnace used in the present invention is the FZ-T-10000-VI-VPO-PC optical floating zone method single crystal growth furnace produced by Japan Crystal Systems Corporation, and what grows is Ca 0.25 Ba 0.75 Nb 2 o 6 crystals.

[0042] Powder CaCO 3 (99.99%), BaCO 3 (99.95%) and Nb 2 o 5 (99.9985%) by Ca 0.25 Ba 0.75 Nb 2 o 6 Stoichiometric ratio was weighed, placed in a ZrO 2 In the nylon tank of the grinding medium, use absolute ethanol as the dispersant for ball milling, dry the 200-mesh sieve, and then put the powder into Al 2 o 3 In the crucible, it was pre-fired at 1220°C for 18 hours with a silicon-molybdenum furnace, crushed and sieved with 80 mesh, then ball milled, dried, and sieved with 200 mesh. to obtain pure phase Ca 0.25 Ba 0.75 Nb 2 o 6 Powder.

[0043] (2) Put the powder obtained in step (1) into a long rubber balloon, compact and seal, vacuumize, and make a biscuit rod with uniform thickness and density under 70MP...

Embodiment 3

[0048] (1) The crystal growth furnace used in the present invention is the FZ-T-10000-VI-VPO-PC optical floating zone method single crystal growth furnace produced by Japan Crystal Systems Corporation, and what grows is Ca 0.28 Ba 0.72 Nb 2 o 6 crystals.

[0049] Powder CaCO 3 (99.99%), BaCO 3 (99.95%) and Nb 2 o 5 (99.9985%) by Ca 0.28 Ba 0.72 Nb 2 o 6 Stoichiometric ratio was weighed, placed in a ZrO 2 In the nylon tank of the grinding medium, use absolute ethanol as the dispersant for ball milling, dry the 200-mesh sieve, and then put the powder into Al 2 o 3 In the crucible, it was pre-fired at 1230°C for 24 hours with a silicon-molybdenum furnace, crushed and sieved with 80 mesh, then ball milled, dried, and sieved with 200 mesh. to obtain pure phase Ca 0.28 Ba 0.72 Nb 2 o 6 Powder.

[0050] (2) Put the powder obtained in step (1) into a long strip of rubber balloon, compact and seal, vacuumize, and make a biscuit rod with uniform thickness and density u...

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Abstract

The invention relates to a method for growing CaxBa1-xNb2O6 series crystals, belonging to the field of crystal growth. The method comprises the following steps: mixing powder CaCO3, BaCO3 and Nb2O5 according to the stoichiometric proportion of CaxBa1-xNb2O6, carrying out ball milling, baking, and passing through a 200-mesh screen, wherein x=0.22, 0.25, 0.28, 0.32 or 0.35; presintering, carrying out ball milling again, baking, and passing through a 80-mesh screen; putting the powder in an elongated rubber balloon, compacting, sealing, and vacuumizing to prepare a biscuit rod with uniform thickness and density under isopressing conditions; sintering the biscuit rod in a dip-coating rotary sintering furnace to obtain a compact and uniform polycrystal rod; putting the polycrystal rod in a floating region furnace, and heating at 60-100 DEG C / minute until the rod and seed crystals are molten, and abutting; and after setting the crystal growth rate at 2-5mm / hour, starting growth, and coolingto room temperature. The invention grows a CaxBa1-xNb2O6 crystal, which is 6-8mm in diameter 50-115mm long and does not have macroscopic defects, by an optical floating region process, has the advantages of high crystallization quality and high efficiency, and simplifies the technique.

Description

technical field [0001] The present invention belongs to Ca x Ba 1-x Nb 2 o 6 (CBN for short) series crystal growth field, specifically relate to a kind of growth Ca x Ba 1-x Nb 2 o 6 Method for series crystals. Background technique [0002] Tetragonal tungsten bronze (TTB) crystal materials have the advantages of being insoluble in water and stable physical and chemical properties, and most of them have special properties such as excellent electrical properties, nonlinear optical properties, electro-optic properties, wide band gaps, and variable crystal phase boundaries. Easy to obtain large-size, high-quality crystal materials, which are widely used in laser frequency doubling, electro-optic modulation, associative storage memory, optical information processing, image amplification, real-time and dynamic interferometry, superconductivity, humidity sensors, pyroelectric detectors, solid fuels, etc. field. [0003] As a new and efficient crystal growth method, the op...

Claims

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Application Information

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IPC IPC(8): C30B29/30C30B13/00
Inventor 王越马云峰蒋毅坚邸大伟徐宏刘国庆
Owner BEIJING UNIV OF TECH
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