Preparation method of rare earth element-doped PMN-PT relaxor ferroelectric powder

A technology of PMN-PT and rare earth elements, applied in chemical instruments and methods, inorganic chemistry, nickel compounds, etc., can solve problems such as uneven composition, achieve uniform composition, simple process steps, and high purity

Inactive Publication Date: 2019-08-30
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention provides a preparation method of PMN-PT relaxor ferroelectric powder doped with rare earth elements, which overcomes the disadvantage of uneven composition in the solid phase reaction method, and has the advantages of economical raw materials, uniform composition and simple process

Method used

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  • Preparation method of rare earth element-doped PMN-PT relaxor ferroelectric powder
  • Preparation method of rare earth element-doped PMN-PT relaxor ferroelectric powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Preparation of 0.025La-PMN-0.29PT powder

[0028] (1) First, PbO (99.9%), La 2 o 3 (99.99%), MgO (99.99%), H 5 Nb 3 o 10 (99.0%), C 16 h 36 o 4 Ti (98.5%) is weighed according to the stoichiometric ratio, calculated with the general chemical formula of 0.025La-PMN-0.29PT, and the above raw materials are all produced by Aladdin (aladdin) company;

[0029] (2) configuration of niobium citrate solution; according to the molar ratio Nb:C 2 h 2 o 4 2H 2 O=1:4 Weigh H 5 Nb 3 o 10 and C 2 h 2 o 4 2H 2 O in a beaker, add an appropriate amount of distilled water, heat and dissolve on a constant temperature magnetic stirrer at 80°C, cool to room temperature after clarification, then add ammonia water, adjust the pH to ≥ 10, and obtain a white precipitate, filter the precipitate suspension to obtain a white of fresh Nb(OH) 5 , according to the molar ratio Nb:C 6 h 8 o 7 ·H 2O=1:4 Weigh citric acid, add to the obtained Nb(OH) 5 Add an appropriate ...

Embodiment 2

[0036] Example 2: Preparation of 0.015Sm-PMN-0.29PT powder

[0037] (1) First, PbO (99.9%), Sm 2 o 3 (99.99%), MgO (99.99%), H 5 Nb 3 o 10 (99.0%), C 16 h 36 o 4 Ti (98.5%) is weighed according to the stoichiometric ratio, and the specific chemical formula is 0.015Sm-PMN-0.29PT, and the above raw materials are all produced by Aladdin Company;

[0038] (2) configuration of niobium citrate solution; according to the molar ratio Nb:C 2 h 2 o 4 2H 2 O=1:4 Weigh H 5 Nb 3 o 10 and C 2 h 2 o 4 2H 2 O in a beaker, add an appropriate amount of distilled water, heat and dissolve on a constant temperature magnetic stirrer at 80°C, cool to room temperature after clarification, then add ammonia water, adjust the pH to ≥ 10, and obtain a white precipitate, filter the precipitate suspension to obtain a white of fresh Nb(OH) 5 , according to the molar ratio Nb:C 6 h 8 o 7 ·H 2 O=1:4 Weigh citric acid, add to the obtained Nb(OH) 5 Add an appropriate amount of distilled ...

Embodiment 3

[0045] Example 3: Preparation of 0.025Pr-PMN-0.29PT powder

[0046] (1) First, PbO (99.9%), Pr 2 o 3 (99.9%), MgO (99.99%), H 5 Nb 3 o 10 (99.0%), C 16 h 36 o 4 Ti (98.5%) is weighed according to the stoichiometric ratio, and the specific chemical general formula is calculated as 0.015Pr-PMN-0.29T, and the above raw materials are all produced by Aladdin Company;

[0047] (2) configuration of niobium citrate solution; according to the molar ratio Nb:C 2 h 2 o 4 2H 2 O=1:4 Weigh H 5 Nb 3 o 10 and C 2 h 2 o 4 2H 2 O in a beaker, add an appropriate amount of distilled water, heat and dissolve on a constant temperature magnetic stirrer at 80°C, cool to room temperature after clarification, then add ammonia water, adjust the pH to ≥ 10, and obtain a white precipitate, filter the precipitate suspension to obtain a white of fresh Nb(OH) 5 , according to the molar ratio Nb:C 6 h 8 o 7 ·H 2 O=1:4 Weigh citric acid, add to the obtained Nb(OH) 5 Add an appropriate ...

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Abstract

The invention discloses a preparation method of rare earth element-doped PMN-PT relaxor ferroelectric powder, and relates to the field of chemical preparation of physical materials. The preparation method can overcome the defect nonuniform components through a solid-phase reaction method, and has advantages of economic and practical raw materials, uniform components and simple process. According to a sol-gel process adopted in the method, glacial acetic acid is used as a solvent and citric acid is used as a chelating agent, oxides of required raw materials are dissolved by using an organic acid to obtain a RE-Pb-Mg-Nb-Ti uniform transparent composite precursor solution, and then the composite precursor solution is put into a drying oven for gelatinization to obtain a dry gel, and finally,the dry gel is calcined at a high temperature to prepare the rare earth element-doped PMN-PT superfine relaxor ferroelectric powder. The preparation method has the advantages that the required raw materials are economical and practical and the operation is simple and feasible, and has a wide application prospect.

Description

technical field [0001] The invention relates to the field of chemical preparation of physical materials, in particular to a preparation method of PMN-PT relaxation ferroelectric powder doped with rare earth elements. Background technique [0002] Since the 1960s, Pb(Mg 1 / 3 Nb 2 / 3 )O 3 (PMN) materials, because of their excellent dielectric properties, perfect voltage stability, and high electrical strain, are often used in multilayer capacitors, actuators, and electro-optic devices. However, because of the low Curie temperature of PMN (-15°C), the application of PMN devices is limited. PMN can be combined with high Curie point PbTiO which is also a perovskite structure 3 (490°C), forming a solid solution PMN-PT with continuous components. According to the phase diagram, different solid solution ratios will have different phase structures and properties. This provides a broad regulatory space for PMN-PT applications. [0003] Doping technology is widely used in material ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00C04B35/499
CPCC01G53/006C04B35/499C04B2235/3206C04B2235/3224C04B2235/3227C04B2235/3234C04B2235/3279
Inventor 杨颖陈朋王一平何亭睿李雄杰胡悫睿
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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