L-tartaric acid ceric sulfate ferroelectric functional material and preparation method thereof

A ferroelectric functional material, tartaric acid technology, applied in the direction of polycrystalline material growth, chemical instruments and methods, single crystal growth, etc., to achieve high yield, low equipment requirements, simple and easy process

Inactive Publication Date: 2012-01-25
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using tartaric acid as a chiral source and doping other inorganic anions to jointly construct and prepare ferroelectric functional materials has not been reported in the literature.

Method used

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  • L-tartaric acid ceric sulfate ferroelectric functional material and preparation method thereof
  • L-tartaric acid ceric sulfate ferroelectric functional material and preparation method thereof
  • L-tartaric acid ceric sulfate ferroelectric functional material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 2mmol (0.34g) of CeO to a polytetrafluoroethylene-lined stainless steel reactor 2 , 4mmol (0.60g) of L-(+)-tar, and then dropwise added 2mL of sulfuric acid solution with a concentration of 1mol / L to mix, then added 16mL of deionized water, stirred evenly, and sealed; Thermal reaction for 5 days, the hydrothermal reaction equation is as follows:

[0021]

[0022] In this way, through hydrothermal synthesis, the hydrolysis reaction is intensified, the oxidation-reduction potential of the substance is significantly changed, and the reaction is accelerated; L-cerium sulfate flaky crystal of tartrate; Grind the flaky crystal of cerium sulfate L-tartrate, sieve it with 100 mesh sieve, and obtain white cerium sulfate L-tartrate monoclinic crystal with a purity of not less than 99% through 100 mesh sieve It is a powder, and the molecular formula of the ferroelectric functional material is [[Ce 2 (H 2 O) 2 (L-(+)-tar) 2 (SO 4 )]·4H 2 O], its molecular structure is...

Embodiment 2

[0024] It is basically the same as Example 1, except that the concentration of sulfuric acid solution is 0.8mol / L, L-(+)-tar is 3mmol, the hydrothermal reaction temperature is 120°C, and the hydrothermal reaction time is 10 days. The stainless steel reactor Cool down to room temperature at a rate of 1°C per hour.

Embodiment 3

[0026] It is basically the same as Example 1, except that the concentration of sulfuric acid solution is 1.2mol / L, L-(+)-tar is 2mmol, the hydrothermal reaction temperature is 200°C, and the hydrothermal reaction time is 3 days. The stainless steel reactor Cool down to room temperature at a rate of 10°C per hour.

[0027] Using a Bruker D8 Focus powder diffractometer to collect the powder diffraction pattern (PXRD) of the example sample at room temperature at a scanning speed of 6° / min in the 2θ angle range of 5-50°, and compare it with the single crystal simulation PXRD diffraction pattern ,Such as figure 2 The indicated purity is not less than 99%. A Seiko TG / DTA 6300 differential thermal analyzer was used to measure α-Al 2 o 3Be reference substance, under the N2 flow protection of 200ml / min, the TG-DTA (differential thermogravimetry of crystal) curve ( image 3 shown). The hysteresis loops of the samples were tested using the Premier II ferroelectric material testing ...

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Abstract

The invention discloses an L-tartaric acid ceric sulfate ferroelectric functional material. The molecular formula of the ferroelectric functional material is [[Ce2(H2O)2(L-(+)-tar)2(SO4)].4H2O]. The ferroelectric functional material can pass through a sieve with 100 meshes, is white monoclinic system powder and has a C2 space group structure. The 2Pr value of a ferroelectric hysteresis of the ferroelectric functional material is 0.316muC/cm<2>, the 2Ec value is 54.1kV/cm, the Ps value is 0.335muC/cm<2> and the saturated intensity of polarization of the ferroelectric functional material is 1.34 times of that of polarization of rochelle salt. The ferroelectric functional characteristics are remarkable. The preparation method of the ferroelectric functional material comprises the following steps of: uniformly mixing cerium dioxide, L-(+)-tartaric acid and sulphuric acid; adding deionized water for a hydro-thermal reaction; after reaction, filtering to obtain an L-tartaric acid ceric sulfate tabular crystal; and grinding and sieving to obtain the colorless L-tartaric acid ceric sulfate monoclinic system powder ferroelectric functional material. The preparation method has the advantages of simple and feasible process, low requirement on equipment, low cost of raw material, high yield, no pollution and the like.

Description

technical field [0001] The invention relates to a ferroelectric functional material, in particular to an L-cerium tartrate sulfate ferroelectric functional material and a preparation method of the ferroelectric functional material. Background technique [0002] Ferroelectric materials are a kind of pyroelectric materials, which are characterized not only by spontaneous polarization, but also within a certain temperature range, the size and direction of the spontaneous polarization dipole moment can vary with the size and direction of the applied electric field. Change. The space group structure of ferroelectric functional materials is one of the following polar point groups: C 1 , C s , C 2 , C 2v , C 3 , C 3v , C 4 , C 4v , C 6 , C 6v . Due to their excellent ferroelectric, dielectric, pyroelectric and piezoelectric properties, ferroelectric materials are widely used in modern electronic technologies, optoelectronics and micromechanics such as ferroelectric memor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/54C30B29/56C30B7/10
Inventor 郑岳青常海圣许伟朱红林林建利
Owner NINGBO UNIV
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