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Core-shell nanoparticles prepared by heterogeneous precipitation method and method for preparing nano ceramic

A nanoparticle and nanoceramic technology, applied in the field of multifunctional materials, can solve the problems of difficult repeated batch preparation and high preparation cost, and achieve the effects of omitting the calcination step, simple preparation method and less operation steps

Active Publication Date: 2021-07-09
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, BCTH ceramics are mostly prepared by solid-state method, and the calcination temperature is as high as ~1300°C, and the sintering temperature is as high as ~1450°C, which makes the preparation cost of ceramics high and it is difficult to prepare repeatedly in batches.

Method used

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  • Core-shell nanoparticles prepared by heterogeneous precipitation method and method for preparing nano ceramic
  • Core-shell nanoparticles prepared by heterogeneous precipitation method and method for preparing nano ceramic
  • Core-shell nanoparticles prepared by heterogeneous precipitation method and method for preparing nano ceramic

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Embodiment 1

[0036] A kind of core-shell nanoparticles prepared by heterogeneous precipitation method, the chemical formula is [(BaCa) 1-x Nd x ](TiHf)O 3 (BCTH-xNd), where Ba / Ca=0.8-0.9 / 0.2-0.1, Ti / Hf=0.85-0.95 / 0.15-0.05, x=0.001-0.05.

[0037] Its preparation method is as follows:

[0038] S1. Weigh BaCl according to the stoichiometric ratio 2· 2H 2 O, CaCl 2 、TiCl 4 , HfO 2 、Nd 2 o 3 ;

[0039]S2. Put the raw materials weighed in step S1 into a hydrothermal kettle, add deionized water and mix evenly, add NaOH to form a supersaturated solution, and prepare perovskite structure BCTH-xNd nanopowder by hydrothermal reaction. The temperature is 160°C, the filling rate is less than 75%, the reaction time is 16h, and the concentration of NaOH is 14M;

[0040] S3. BCTH-xNd core-shell nanoparticles were prepared by using the point charge defects generated by asymmetric doping combined with electric field to induce heterogeneous precipitation. The electric field was an alternating elec...

Embodiment 2～9

[0043] The experimental method and material of embodiment 2~9 are all identical with embodiment 1, and its experimental condition sees the following table:

[0044] The experimental condition of table 1 embodiment 1~9

[0045]

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Abstract

The invention belongs to the field of multifunctional materials, and particularly relates to core-shell nanoparticles prepared by a heterogeneous precipitation method and a method for preparing nano ceramic. According to the technical key points, the preparation method comprises the operation steps shown in the specification. The chemical formula is [(BaCa)<1-x>Nd<x>](TiHf)O<3>(BCTH-xNd), Ba / Ca is equal to 0.8-0.9 / 0.2-0.1, Ti / Hf is equal to 0.85-0.95 / 0.15-0.05, and x is equal to 0.001-0.05. According to the invention, the high-activity nano powder prepared by a hydrothermal method is used as a precursor, so that the calcination process of ceramic prepared by a solid phase method can be omitted, the nano ceramic can be prepared by low-temperature sintering, novel multifunctional ceramic can be developed, new physical properties can be excavated, and the nano ceramic has industrial value.

Description

technical field [0001] The invention belongs to the field of multifunctional materials, and in particular relates to a core-shell nano particle prepared by a heterogeneous precipitation method and a method for preparing nano ceramics. Background technique [0002] With the development of integration, miniaturization and intelligence of electronic components, multifunctional materials and devices have attracted worldwide research interest. With Pb(Zr 1-x Ti x )O 3 (PZT), represented by perovskite structure piezoelectric ceramics, provides rich possibilities for the development of piezoelectric, fluorescent, and energy storage multifunctional materials by doping rare earths and generating donor or acceptor point charge defects. However, the main component of PZT piezoelectric ceramics, PbO, is harmful to human health during the production and disposal process, and brings global pollution problems. Therefore, it is urgent to develop high-performance lead-free piezoelectric m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G27/00B82Y40/00B82Y30/00C04B35/626C04B35/49
CPCC01G27/006B82Y40/00B82Y30/00C04B35/626C04B35/49C01P2004/80C01P2002/72C01P2004/04C01P2006/42C01P2004/03C01P2006/60
Inventor 方必军何希悦吴盾陆小龙丁建宁
Owner CHANGZHOU UNIV
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