Chromate and chromium sesquioxide multiferroic nanometer composite material and preparation method thereof

A technology of chromium trioxide multiferroic, nano-composite material, applied in the directions of chromium trioxide, chromium oxide/hydrate, chromate/dichromate, etc., to achieve the effects of short cycle, low cost and simple operation

Inactive Publication Date: 2011-09-07
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the general preparation methods for chromate and chromium trioxide multiferroic nanocomposites have not been recorded in domestic and foreign literature.

Method used

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  • Chromate and chromium sesquioxide multiferroic nanometer composite material and preparation method thereof
  • Chromate and chromium sesquioxide multiferroic nanometer composite material and preparation method thereof
  • Chromate and chromium sesquioxide multiferroic nanometer composite material and preparation method thereof

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preparation example Construction

[0028] A method for preparing a chromate and chromium oxide multiferroic nanocomposite material provided by an embodiment of the present invention comprises the following steps:

[0029] Step A. Configure the mixed solution of transition metal ions containing chromium: select transition metal nitrate as raw material, preferably, adopt any one of copper nitrate, nickel nitrate or cobalt nitrate as raw material, ammonium bicarbonate as precipitant, wherein nitric acid Chromium as antiferromagnetic Cr 2 o 3 The ion source, the transition metal nitrate as the multiferroic chromate oxide MCr 2 o 4 (wherein, M represents a magnetic transition metal, when using copper nitrate as a raw material, M=Cu; when using nickel nitrate as a raw material, M=Ni; when using cobalt nitrate as a raw material, M=Co), molar Dissolve transition metal nitrate and chromium nitrate in deionized water, prepare a solution with a concentration of chromium ions of 0.2-0.6 mol / L, wherein the chemical molar...

Embodiment 1

[0035] Ferromagnetic CoCr with a sintering temperature of 900 °C was prepared as described above 2 o 4 and antiferromagnetic Cr 2 o 3 nanocomposite materials. The first step is to weigh cobalt nitrate and chromium nitrate according to the chemical molar ratio of cobalt ion and chromium ion being 1:50, wherein the cobalt nitrate is 0.001mol, and the chromium nitrate is 0.05mol. After mixing, they are dissolved in deionized water and configured as chromium ions A mixed solution of metal ions with a concentration of 0.5mol / L; in the second step, weigh 0.2mol ammonium bicarbonate according to the stoichiometric ratio, dissolve it in a beaker, and configure it into a solution of 0.8mol / L; under constant stirring, mix the metal ions The mixed solution was dropped into the ammonium bicarbonate solution to form a precipitate; in the third step, the precipitate was filtered and washed 8 times, and then dried in an oven at 150°C until a dry powder was obtained; in the fourth step, th...

Embodiment 2

[0037] Ferromagnetic NiCr with a sintering temperature of 700 °C was prepared according to the above method 2 o 4 and antiferromagnetic Cr 2 o 3 nanocomposite materials. The first step is to weigh nickel nitrate and chromium nitrate according to the chemical molar ratio of nickel ions and chromium ions as 1:10, wherein the nickel nitrate is 0.005mol, and the chromium nitrate is 0.05mol. After mixing, they are dissolved in deionized water and configured as chromium ions A metal ion mixed solution with a concentration of 0.5mol / L; in the second step, weigh 0.2mol ammonium bicarbonate according to the stoichiometric ratio, dissolve it in a beaker, and configure it into a 0.6mol / L solution, and the ammonium bicarbonate should be over 30%; Under constant stirring, drop the metal ion mixed solution into the ammonium bicarbonate solution to form a precipitate; the third step is to filter and wash the precipitate for 12 times, and then dry it in an oven at 120°C until a dry powder ...

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Abstract

The invention relates to the field of spinning electron materials, and discloses a method for preparing a chromate and chromium sesquioxide multiferroic nanometer composite material, which comprises the following steps of: A, preparing chromium-containing transition metal ion mixed solution; B, dissolving ammonium bicarbonate in deionized water according to a stoichiometric ratio, and dripping the metal ion mixed solution into ammonium bicarbonate solution with continuous stirring to form precipitates; C, filtering and washing the precipitates for multiple times, drying in a drying oven, and putting the dried powder into an electric furnace for presintering; and D, sintering the powder obtained in the step C in the air at a high temperature to form the chromate and chromium sesquioxide multiferroic nanometer composite material. The invention provides a preparation method for the chromate and chromium sesquioxide multiferroic nanometer composite material; and by the preparation method, the prepared chromate and chromium sesquioxide multiferroic nanometer composite material has an obvious magnetic exchange bias effect, and a material system of the multiferroic nanometer composite material with the magnetic exchange bias effect is broadened.

Description

technical field [0001] The invention relates to the field of spin electron materials, in particular to a chromate and chromium trioxide multiferroic nanocomposite material and a preparation method thereof. Background technique [0002] In the past two decades, the study of spintronics has set off an upsurge all over the world. Among them, the exchange bias effect of the ferromagnetic / antiferromagnetic system plays a key role in the development of spintronics, and is the basis for the development of spintronic devices such as spin valves, magnetic memories, and spin transistors. In addition, multiferroic materials, materials that exhibit both ferroelectric (antiferroelectric) and ferromagnetic (antiferromagnetic) or ferroelastic ordering properties, were developed at the beginning of this century. Utilizing the coupling effect between electric polarization and magnetization in this material, the external magnetic field can control the ferroelectric polarization or the extern...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G37/14C01G37/033B82Y40/00B82Y30/00
Inventor 袁松柳田召明汤建帮段寒凝邱洋
Owner HUAZHONG UNIV OF SCI & TECH
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