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Single-phase multiferroic ceramic material and preparation method thereof

A technology of multiferroic ceramics and ceramic materials, applied in the field of multiferroic ceramics and its preparation, can solve the problems of weak magnetic properties of bismuth ferrite, and achieve the effect of simple preparation method

Active Publication Date: 2017-08-04
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the technical problem of weak magnetism of bismuth ferrite, a single-phase multiferroic material with coexistence of antiferromagnetism and ferroelectricity at room temperature, and provides a single-phase multiferroic ceramic material and its preparation method

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  • Single-phase multiferroic ceramic material and preparation method thereof
  • Single-phase multiferroic ceramic material and preparation method thereof
  • Single-phase multiferroic ceramic material and preparation method thereof

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specific Embodiment approach 1

[0022] Specific embodiment one: the chemical expression of the single-phase multiferroic ceramic material of this embodiment is Ba 0.7 Ca 0.3 FeTaO 3 , and is a ceramic material composed of rod-shaped grains, abbreviated as BCFT.

[0023] The grain rods of the single-phase multiferroic ceramic material in this embodiment have a diameter of 0.5-1 μm and a length of 5-20 μm.

specific Embodiment approach 2

[0024] Specific embodiment two: the preparation method of the single-phase multiferroic ceramic material described in specific embodiment one, carries out according to the following steps:

[0025] 1. Barium carbonate (BaCO 3 ), calcium carbonate (CaCO 3 ), ferric oxide (Fe 2 o 3 ) and tantalum pentoxide (Ta 2 o 5 ) powder according to Ba 0.7 Ca 0.3 FeTaO 3 The stoichiometric ratio is weighed and mixed uniformly to obtain a mixed powder;

[0026] 2. Add alcohol to the mixed powder obtained in step 1, and ball mill in a ball mill at a speed of 200-400rpm for 12-48 hours to obtain a suspension A;

[0027] 3. Dry the suspension A obtained in step 2 to obtain powder A, and then put the powder A into a tube furnace and keep it at a temperature of 1100-1250°C for 3-6 hours to obtain a pre-calcined powder ;

[0028] 4. Add alcohol to the calcined powder obtained in step 3, and ball mill in a ball mill at a speed of 200-400 rpm for 12-48 hours to obtain a suspension B;

[0...

specific Embodiment approach 3

[0032] Embodiment 3: This embodiment differs from Embodiment 2 in that the drying temperature in Step 3 is 80° C. to 100° C.; others are the same as Embodiment 2.

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Abstract

The invention discloses a single-phase multiferroic ceramic material and a preparation method thereof, relates to a multiferroic ceramic material and a preparation method thereof, and aims to solve a technical problem of weak magnetic property of the conventional single-phase multiferroic material bismuth ferrite. The single-phase multiferroic ceramic material provided by the invention has a chemical formula of Ba0.7Ca0.3FeTaO3; the preparation method comprises the following steps: mixing barium carbonate, calcium carbonate, iron trioxide and tantalum pentoxide powder; then, wet ball-milling; drying and then placing in a tubular furnace for pre-burning; then, wet ball-milling; drying and then adding a binder for being pressed into a preform; then, sintering the preform in the tubular furnace to obtain the single-phase multiferroic ceramic material. The single-phase multiferroic ceramic material has a tetragonal structure at room temperature, also has ferromagnetism and ferroelectricity, and can be applied to electrical and electronic fields.

Description

technical field [0001] The present invention relates to multiferroic ceramics and a preparation method thereof. Background technique [0002] Multiferroic materials refer to materials with two or more iron orders in the same phase. It was first proposed by Swiss scientist Schmid in 1994. The iron orders include ferromagnetic order, ferroelectric order, ferroelastic order and ferroelastic order. Iron vortex sequence. The most studied multiferroic materials are magnetoelectric multiferroic materials with coexistence of magnetism and ferroelectricity. Generally, materials with coexistence of magnetism (ferromagnetism, ferrimagnetism, antiferromagnetism and non-collinear magnetism, etc.) and ferroelectricity are called It is a magnetoelectric multiferroic material. In magnetoelectric multiferroic materials, there is a certain coupling effect between magnetism and ferroelectricity, which has broad application prospects in the fields of information storage, spintronic devices, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495
CPCC04B35/495C04B2235/3208C04B2235/3215C04B2235/3272C04B2235/602C04B2235/656C04B2235/6567C04B2235/78C04B2235/782C04B2235/786C04B2235/788
Inventor 李均白晗周忠祥
Owner HARBIN INST OF TECH
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