Tartaric acid terbium ferroelectric functional material and preparation method thereof

A ferroelectric functional material and tartaric acid technology, which is applied in the field of ferroelectric functional materials to achieve the effects of low equipment requirements, simple process and easy industrialization

Inactive Publication Date: 2012-06-27
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 co

Method used

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  • Tartaric acid terbium ferroelectric functional material and preparation method thereof
  • Tartaric acid terbium ferroelectric functional material and preparation method thereof
  • Tartaric acid terbium ferroelectric functional material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 0.4mmol of L-(+)-tartaric acid (C 4 h 6 o 6 ) was dissolved in 40mL deionized water, and prepared into a tartaric acid solution with a concentration of 0.1mol / L for use; weigh 0.2mmol of Tb 4 o 7 , add 5mL of dilute hydrochloric acid solution, heat and stir, and evaporate to dryness to obtain terbium chloride as a white solid; slowly add the prepared terbium chloride into the prepared tartaric acid solution while stirring, continue stirring for 30 minutes after adding, and then use 0.1 mol / L NaOH solution to adjust the pH of the solution to 3.5, then filter to remove insoluble matter, place the filtrate in a thermostat at 45°C, and let it stand for 4 days to obtain colorless blocky crystals; place the crystals in an agate mortar Grinding and passing through a 100-mesh sieve to obtain terbium tartrate powder with ferroelectric properties.

Embodiment 2

[0025] Substantially the same as Example 1, except that the L-(+)-tartaric acid that takes 8mol is made into the tartaric acid solution that concentration is 1mol / L, and the terbium nitrate that takes terbium ion is 2mol is added in the tartaric acid solution, and adding Stirring was continued for 40 min, the pH of the solution was adjusted to 5.0 with 1 mol / L KOH solution, the insoluble matter was removed by filtration, and the filtrate was placed in a thermostat at 60°C for 2 days.

Embodiment 3

[0027] It is basically the same as in Example 1, except that the L-(+)-tartaric acid of 0.6mol is taken by weighing to form a tartaric acid solution with a concentration of 0.6mol / L, and the terbium acetate of 0.2mol of terbium ion is added to the tartaric acid solution , continue to stir for 20min after adding, use 0.5mol / L Na 2 CO 3 or K 2 CO 3Solution The pH of the solution was adjusted to 2.10, the insoluble matter was removed by filtration, and the filtrate was placed in a thermostat at 30° C. for 7 days.

[0028] In above-mentioned embodiment 1, use dilute hydrochloric acid and Tb 4 o 7 To prepare terbium chloride, analytically pure terbium chloride can also be directly weighed instead. Terbium chloride, terbium nitrate and terbium acetate nitrate can also be replaced with other terbium salts in the foregoing embodiments. In the above examples, L-(+)-tartaric acid can also be replaced by D-(-)-tartaric acid or DL-tartaric acid. They are not listed here.

[0029] ...

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Abstract

The invention discloses a tartaric acid terbium ferroelectric functional material, which is 100-mesh white tetragonal crystal system powder, and has a molecular formula of [Tb(H2O)3(C4H5O6) (C4H4O6)], a P41 space group structure, an electric hysteresis 2Ec value of 44.3kV . cm-1, 2, a Pr value of 1.60muC . cm-2, a Ps value of 0.176muC . cm-2, and better ferroelectric properties. A preparation method of the ferroelectric functional material is characterized in that: a terbium salt and a tartaric acid are synthesized into the high-purity tartaric acid terbium ferroelectric functional material by a soft synthesis method in coordination chemistry, and the better nucleation and growth of tartaric acid terbium crystals can be realized by controlling the concentration and ratio of the material, the pH value of a solution to 2 to 5, and the temperature of nucleation and growth of the crystal to 30-60 DEG C and the like. The method provided by the invention has the advantages of few flow, simple process, low equipment requirements, cheap terbium salt and tartaric acid as raw materials, no pollution, low cost, and easiness in industrialization.

Description

technical field [0001] The invention relates to a ferroelectric functional material, in particular to a terbium tartrate ferroelectric functional material and a preparation method thereof. Background technique [0002] Ferroelectric functional materials (ferroelectrics) refer to a class of functional materials whose crystal structure has spontaneous polarization when no external electric field is applied, and the direction of spontaneous polarization can be reversed or reoriented by an external electric field. 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 , which is a branch of pyroelectric materials. 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 memory, infrared dete...

Claims

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Application Information

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IPC IPC(8): C07F5/00
Inventor 许伟常海圣郑岳青朱红林林建利
Owner NINGBO UNIV
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