A method for growing bife1‐xcoxo3 series crystals

A bife1-xcoxo3, fe2o3 technology, applied in the field of growing BiFe1‐xCoxO3 series crystals, can solve the problem of invisible ferromagnetism, and achieve the effect of suppressing the generation of miscellaneous items, fast growth, and eliminating potential pollution

Inactive Publication Date: 2015-08-26
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Pure phase BiFeO 3 It has a rhombohedral (triangular) twisted perovskite structure, although the R3C point group it belongs to has weak ferromagnetism in theory, but at the Neil temperature, due to its G-type antiferromagnetic ordered helical spin structure The magnetic period of BiFeO is 62nm. This structurally compatible modulation determines that most of the atomic magnetic moments cancel each other out, making BiFeO 3 Macroscopically, the existence of ferromagnetism is hardly observed, which limits its application

Method used

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  • A method for growing bife1‐xcoxo3 series crystals
  • A method for growing bife1‐xcoxo3 series crystals
  • A method for growing bife1‐xcoxo3 series crystals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (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 BiFe 0.99 co 0.01 o 3 series of crystals.

[0023] Powder Fe 2 o 3 (99.99%), Bi 2 o 3 (99.99%) and CoO (99.99%) by BiFe 0.99 co 0.01 o 3 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 850°C for 1 hour with a silicon-molybdenum furnace, crushed and sieved with 80 mesh, then ball milled, dried, and sieved with 200 mesh. Get BiFe 0.99 co 0.01 o 3 Powder.

[0024] (2) Put the powder prepared in step (1) into a long rubber balloon, compact and seal it, vacuumize it for 10 minutes, and make a green bar with uniform thickness and density under 65MPa isostatic pressure. ...

Embodiment 2

[0028] (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 BiFe 0.97 co 0.03 o 3 series of crystals.

[0029] Powder Fe 2 o 3(99.99%), Bi 2 o 3 (99.99%) and CoO (99.99%) by BiFe 0.97 co 0.03 o 3 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 845°C for 1 hour in a silicon-molybdenum furnace, crushed and sieved to 80 mesh, then ball milled, dried, and sieved to 200 mesh. Get BiFe 0.97 co 0.03 o 3 Powder.

[0030] (2) Put the powder prepared in step (1) into a long rubber balloon, compact and seal, vacuumize for 10 minutes, and make a green bar with uniform thickness and density under 65MPa isostatic pressure.

[0031] (3)...

Embodiment 3

[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 BiFe 0.95 co 0.05 o 3 series of crystals.

[0035] Powder Fe 2 o 3 (99.99%), Bi 2 o 3 (99.99%) and CoO (99.99%) by BiFe 0.95 co 0.05 o 3 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 is pre-fired at 840°C for 1 hour with a silicon-molybdenum furnace, crushed and sieved with 80 mesh, then ball milled, dried, and sieved with 200 mesh. Get BiFe 0.95 co 0.05 o 3 Powder.

[0036] (2) Put the powder prepared in step (1) into a long rubber balloon, compact and seal, vacuumize for 15 minutes, and make a green bar with uniform thickness and density under 65MPa isostatic pressure.

[00...

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Abstract

The invention discloses a method for BiFe1-xCoxO3 series crystal growth and belongs to the field of the crystal growth. Fe203 powder, Bi2O3 powder and CoO powder are proportioned according to the BiFe1-xCoxO3 stoichiometric ratio, wherein x=0.01 or 0.03 or 0.05 or 0.07 or 0.09 or 0.11, ball milling and baking are carried out and 200 mesh sieving is carried out. The processes of pre-burning, second-time ball milling, baking and 80 mesh sieving are carried out. The powder is packed into a strip rubber air balloon to be tightly pressed and enclosed, vacuum pumping is carried out for 10-15 minutes, and a biscuit bar is prepared under the isostatic pressuring. The biscuit bar is placed in a floating region furnace to be heated up to a charge bar at the rate of 30-50 DEG C / minute and then is melted and in butt joint with a seed crystal. The growth speed of a crystal is set to be 10-15mm / hour, and after the crystal starts to grow, the temperature of the crystal is cooled to the room temperature. For the first time, the optical floating region method is used for growth of the BiFe1-xCoxO3 series crystal of which the diameter is 5-6mm, the length is 60-100mm and the appearance is bright and dark colored. The quality of the grown crystal is high, the technology is simplified and the efficiency is high.

Description

technical field [0001] The present invention belongs to BiFe 1‐x co x o 3 (referred to as BFCO) series crystal growth field, specifically related to a growing BiFe 1‐x co x o 3 Method for series crystals. Background technique [0002] Multiferroic materials refer to functional materials that have two or more properties of (anti)ferroelectricity, (anti)ferromagnetism and ferroelasticity at the same time. Bismuth ferrite (BiFeO 3 ) as one of the few single-phase multiferroic materials that can simultaneously exhibit ferroelectricity at room temperature (Curie transition temperature T C =1103K) and weaker antiferromagnetism (Neel phase transition temperature T N =643K), the coupling effect of ferroelectricity and ferromagnetism makes it have broad application prospects in the fields of magnetoelectric (ferroelectric) information storage, nonlinear optics, spintronics, magnetoelectric sensors and drivers, etc. [0003] Pure phase BiFeO 3 It has a rhombohedral (triangul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B13/00C30B29/22
Inventor 王越邸大伟马云峰蒋毅坚
Owner BEIJING UNIV OF TECH
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