Preparation method of holmium cuprate nano powder

A nano-powder, holmium cuprate technology, applied in the field of preparation of holmium cuprate nano-powder, can solve the problem that the strict stoichiometric ratio of copper ions and rare earth ions cannot be solved, the purity of the sample is closely related to the properties, and the size of the nanometer cannot be reached. and other problems, to achieve the effect of regular particle shape, low cost and good particle consistency

Active Publication Date: 2016-06-22
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods all face the same problem: they cannot solve the problem of strict stoichiometric ratio of copper ions and rare earth ions, and cannot prepare products with high purity and uniform composition, and the purity of samples is closely related to their properties.
However, the Ho prepared by the existing preparation met

Method used

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  • Preparation method of holmium cuprate nano powder
  • Preparation method of holmium cuprate nano powder
  • Preparation method of holmium cuprate nano powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Holmium Cuprate Ho 2 Cu 2 O 5 The preparation method of nano powder includes the following steps:

[0039] S1, follow Ho 2 Cu 2 O 5 In the stoichiometric ratio of Cu to Ho, weigh 2mmoL of copper nitrate and 2mmoL of holmium carbonate, and dissolve them in deionized water. The amount of deionized water is 4 times the total mass of copper nitrate and holmium carbonate. Mix well to prepare solution A;

[0040] S2. Weigh 4mmoL of dipicolinic acid and dissolve it in 30mL of methanol, add 6mmoL of NaOH to prepare solution B;

[0041] S3. Mix solution A and solution B, and magnetically stir for 1 hour to prepare solution C; slowly warm solution C to 30°C and keep it for 1 hour to precipitate precursor D; precursor D is a Cu-Ho complex precursor crystal;

[0042] S4. Place the precursor D in a nitrogen atmosphere and sinter at 450°C for 6 hours, then cool to room temperature, and then calcinate in an air atmosphere at 800°C for 2 hours to obtain a calcined product;

[0043] S5. After the...

Embodiment 2

[0045] Holmium Cuprate Ho 2 Cu 2 O 5 The preparation method of nano powder includes the following steps:

[0046] S1, follow Ho 2 Cu 2 O 5 In the stoichiometric ratio of Cu to Ho, weigh 2mmoL of copper acetate and 2mmoL of holmium nitrate and dissolve them in deionized water. The amount of deionized water is 6 times the total mass of copper acetate and holmium nitrate. Mix well to prepare solution A;

[0047] S2. Weigh 8mmoL of pyridine tricarboxylic acid and dissolve it in 50mL of ethanol, add 24mmoL of KOH to prepare solution B;

[0048] S3. Mix solution A and solution B, and mechanically stir for 2 hours to prepare solution C; slowly warm solution C to 100°C and keep it for 1 hour to precipitate precursor D;

[0049] S4. Place the precursor D in an ammonia atmosphere, sinter at 550°C for 3 hours, then cool to room temperature, and then calcinate in an air atmosphere at 1100°C for 1 hour to obtain a calcined product;

[0050] S5. The calcined product is crushed, ground, passed through...

Embodiment 3

[0052] Holmium Cuprate Ho 2 Cu 2 O 5 The preparation method of nano powder includes the following steps:

[0053] S1, follow Ho 2 Cu 2 O 5 In the stoichiometric ratio of Cu to Ho, weigh 2mmoL of copper carbonate and 2mmoL of holmium acetate and dissolve them in deionized water. The amount of deionized water is 5 times the total mass of copper carbonate and holmium acetate. Mix well to prepare solution A;

[0054] S2. Weigh 6mmoL dipicolinic acid and dissolve it in 40mL propanol, add 12mmoL triethylamine to prepare solution B;

[0055] S3. Mix solution A and solution B, and magnetically stir for 1.5 hours to prepare solution C; slowly warm solution C to 60° C. and keep it for 1.5 hours to precipitate precursor D; precursor D is a Cu-Ho complex precursor crystal;

[0056] S4. Place the precursor D in a hydrogen atmosphere, sinter at 500°C for 4.5 hours, then cool to room temperature, and then calcinate in an air atmosphere at 1000°C for 1.5 hours to obtain a calcined product;

[0057] S5....

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Abstract

The invention discloses a preparation method of holmium cuprate nano powder. The preparation method comprises the following steps: weighing a Cu soluble salt and a Ho soluble salt according to the Cu/Ho stoichiometric proportion in the holmium cuprate Ho2Cu2O5, dissolving the Cu soluble salt and Ho soluble salt in deionized water, and uniformly mixing to prepare a solution A; weighing pyridine carboxylic acid, dissolving the pyridine carboxylic acid in alcohol, and adding an alkali to prepare a solution B; mixing the solution A and solution B, and stirring to prepare a solution C; slowly heating the solution C to precipitate a precursor D; sintering the precursor D in a reducing gas atmosphere, cooling to room temperature, and calcining in an air atmosphere to obtain a calcined product; and pulverizing the calcined product, grinding, screening, washing and drying. The preparation method disclosed by the invention can be used for preparing high-purity uniform-component Ho2Cu2O5 nano powder. The preparation method has the advantages of simple and accessible raw materials, low cost, mild conditions and high controllability, and is simple to operate.

Description

Technical field [0001] The invention relates to a preparation method of holmium cuprate nanopowder, in particular to the technical field of preparation of copper-based rare earth materials. Background technique [0002] The common configuration of copper-based rare earth materials is A 2 B 2 O 5 , Belongs to the layered perovskite type oxide, and the layered perovskite type oxide is widely used because of its special physical and chemical properties. Mainly used in sensors, electrolytes, superconductors, electrode materials, and improving the environment. The study on the preparation of layered perovskite-type oxides has broad application prospects. Controlling its morphology can change its structure and performance, thereby improving its many deficiencies in various applications. [0003] Common methods for preparing copper-based rare earth materials include high-temperature solid-phase synthesis, sol-gel, co-precipitation, hydrothermal, combustion, and so on. These methods all ...

Claims

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Application Information

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IPC IPC(8): C01G3/00B82Y40/00
CPCC01G3/00C01P2002/72C01P2004/03C01P2004/24C01P2006/12C01P2006/80
Inventor 郭瑞刘宣文刘广刘芳辰李朝阳齐靖宇郑智文周婉琳
Owner NORTHEASTERN UNIV
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