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Hydrated L-tartrate neodymium sulfate ferroelectric functional material and preparation method

A technology of ferroelectric functional materials and tartaric acid, which is applied in the field of ferroelectric functional materials, can solve the problems that cannot meet the requirements of microelectronic devices, and achieve the effects of low cost, low equipment requirements, and easy industrialization

Inactive Publication Date: 2015-09-02
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the mid-1980s, breakthroughs in thin film preparation technology cleared the way for the preparation of high-quality ferroelectric thin films. In recent years, with the continuous improvement of the requirements for device miniaturization, functional integration, and reliability, the traditional ferroelectric Bulk has been unable to meet the requirements of microelectronic devices due to size constraints
Judging from the current research status, the research, development and application of ferroelectric materials with high performance are still in the development stage.

Method used

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  • Hydrated L-tartrate neodymium sulfate ferroelectric functional material and preparation method
  • Hydrated L-tartrate neodymium sulfate ferroelectric functional material and preparation method
  • Hydrated L-tartrate neodymium sulfate ferroelectric functional material and preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh 0.5mmol of neodymium trioxide and 2.0mmol of L-tartaric acid, dissolve them in a solvent prepared from 16mL of deionized water and 2mL of ethanol, stir for about 30min to completely dissolve the neodymium trioxide and L-tartaric acid; Sulfuric acid solution 0.5mL, then placed in a polytetrafluoroethylene-lined stainless steel reaction kettle, after stirring evenly, seal the stainless steel reaction kettle, and react at a constant temperature for 3 days at a reaction temperature of 150°C; after the reaction is completed, let the stainless steel reaction kettle 5°C / h cooling mode, cooled to room temperature, to obtain lavender L-tartrate neodymium sulfate flaky crystals, grind the hydrated L-tartrate neodymium sulfate flaky crystals, and sieve with a 100 mesh sieve to obtain the 100 mesh sieve Lavender hydrated L-tartrate neodymium sulfate monoclinic powder. The PXRD pattern of this ferroelectric functional material is as follows figure 2 As shown, it can be seen ...

Embodiment 2

[0017] It is basically the same as Example 1, except that the L-tartaric acid is 0.5mmol, dissolved in a solvent prepared from 17mL deionized water and 3mL ethanol, 0.6mL of sulfuric acid solution, in a stainless steel reactor, the reaction temperature is 120 ° C, constant temperature The response time is 10 days.

Embodiment 3

[0019] It is basically the same as Example 1, except that L-tartaric acid is 1.0 mmol, sulfuric acid solution is 0.4 mL, in a stainless steel reactor, the reaction temperature is 200° C., and the constant temperature reaction time is 1 day.

[0020] Adopt Rigaku R-Axis Rapid single crystal diffractometer to carry out single crystal X-ray diffraction to the crystal that above-mentioned embodiment obtains, obtain as follows figure 1 Structural diagram of neodymium sulfate L-tartrate hydrate shown.

[0021] Use Bruker D 8 Focus powder diffractometer with 2θ angle range of 5-50°, scan the hydrated L-tartrate neodymium sulfate ferroelectric powder obtained in the above example at a scanning speed of 8° / min, and collect samples at room temperature Powder diffraction pattern (PXRD), and compared with the single crystal simulation PXRD pattern, such as figure 2 shown.

[0022] A Seiko TG / DTA 6300 differential thermal analyzer was used to measure α–Al 2 o 3 As a reference substanc...

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Abstract

The invention discloses a hydrated L-tartaric acid neodymium sulfate ferroelectric functional material and a preparation method thereof. The ferroelectric functional material has a molecular formula of {Nd2(H2O)2(L-C4H4O6)2(SO4)}.4H2O. The ferroelectric functional material has the following ferroelectric characteristic parameters: the remanent polarization 2Pr is 0.390 mu C / cm<2>; the coercive electric field 2Ec is 74.7 kv / cm; and the saturation polarization Ps is 0.307 mu C / cm<2>. The saturation polarization of the ferroelectric functional material is 1.23 times that of seignette salt, so that the ferroelectric functional material disclosed by the invention is a novel ferroelectric body with excellent ferroelectric performance. The preparation method comprises the following steps: carrying out a solvothermal reaction between neodymium oxide and L-tartaric acid by using an ethanol solvent; and adding a sulfuric acid solution into the mixture and nucleating in a reaction kettle so as to grow into the hydrated L-tartaric acid neodymium sulfate. The preparation method has the advantages of short flow, simple process, low equipment requirement, no pollution and low cost and can be easily industrialized.

Description

technical field [0001] The invention relates to a ferroelectric functional material, in particular to a hydrated L-tartrate neodymium sulfate ferroelectric functional material and a preparation method. Background technique [0002] Ferroelectric functional materials have important properties such as dielectricity, piezoelectricity, pyroelectricity, ferroelectricity, electro-optic effect, acousto-optic effect, photorefractive effect and nonlinear optical effect, and can be used to make ferroelectric memory, thermal Discharge infrared detectors, spatial light modulators, optical waveguide dielectric phase shifters, voltage-controlled filters and other important new components. These components have broad application prospects in aerospace, communication, home appliances, national defense and other fields. From a crystallographic point of view, only 1(C 1 ), m(C s ), 2(C 2 ), 2m (C 2v ), 3(C 3 ), 3m (C 3v ), 4(C 4 ), 4m (C 4v ), 6(C 6 ), 6m (C 6v ) of 10 polar point ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F5/00
Inventor 戚金丽郑岳青虞晓科常海圣许伟朱红林林建利
Owner NINGBO UNIV
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