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Potassium sodium niobate transparent ferroelectric ceramic material modified by bismuth magnesium niobate and its preparation method using low-purity raw materials

A technology of potassium sodium niobate and ferroelectric ceramics, applied in the field of materials, can solve problems such as ecological and environmental hazards, and achieve excellent performance, strong practicability, and good repeatability

Inactive Publication Date: 2018-08-24
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since lead-based transparent ferroelectric ceramics contain more than 70% lead, which has brought serious harm to human beings and the ecological environment, many countries such as the European Union, the United States, Japan, and China have formulated multiple laws and regulations to stipulate that all newly produced electronic products should be lead-free

Method used

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  • Potassium sodium niobate transparent ferroelectric ceramic material modified by bismuth magnesium niobate and its preparation method using low-purity raw materials
  • Potassium sodium niobate transparent ferroelectric ceramic material modified by bismuth magnesium niobate and its preparation method using low-purity raw materials
  • Potassium sodium niobate transparent ferroelectric ceramic material modified by bismuth magnesium niobate and its preparation method using low-purity raw materials

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Experimental program
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Effect test

Embodiment 1

[0030] 1. Ingredients

[0031] According to 0.93(K 0.5 Na 0.5 )NbO 3 -0.07Bi(Mg 1 / 3 Nb 2 / 3 )O 3 The stoichiometry was weighed separately for Na with a purity of 99.0%. 2 CO 3 3.6069g of K with a purity of 99.8% 2 CO 3 4.7414g Nb with a purity of 99.5% 2 o 5 19.0564g of Bi with a purity of 97% 2 o 3 2.4560g, purity are 98.5% MgO 0.1395g, mix homogeneously, raw material mixture is packed in the nylon tank, be ball milling medium with zirconium ball, dehydrated alcohol, the mass ratio of dehydrated alcohol and raw material mixture is 1: 1.2, use a ball mill at 401 rpm for 16 hours, separate the zirconium balls, place the raw material mixture in a drying oven at 80°C for 10 hours, grind with a mortar for 30 minutes, and pass through an 80-mesh sieve.

[0032] 2. Pre-burning

[0033] Place the raw material mixture after step 1 through an 80-mesh sieve in an alumina crucible, and compact it with an agate rod so that its compacted density is 1.5g / cm 3 , cover it, pl...

Embodiment 2

[0045] In the batching step 1 of the present embodiment, according to 0.97 (K 0.5 Na 0.5 )NbO 3 -0.03Bi(Mg 1 / 3 Nb 2 / 3 )O 3 The stoichiometry was weighed separately for Na with a purity of 99.0%. 2 CO 3 3.8736g of K with a purity of 99.8% 2 CO 3 5.0919g of Nb with a purity of 99.5% 2 o 5 19.8892g of Bi with a purity of 97.0% 2 o 3 1.0838g, 0.0615g of MgO with a purity of 98.5%, and the other steps were the same as in Example 1 to prepare a potassium sodium niobate transparent ferroelectric ceramic material modified by bismuth magnesium niobate.

Embodiment 3

[0047] In the batching step 1 of the present embodiment, according to 0.95 (K 0.5 Na 0.5 )NbO 3 -0.05Bi(Mg 1 / 3 Nb 2 / 3 )O 3 The stoichiometry was weighed separately for Na with a purity of 99.0%. 2 CO 3 3.7383g of K with a purity of 99.8% 2 CO 3 4.9141g of Nb with a purity of 99.5% 2 o 5 19.4667g of Bi with a purity of 97.0% 2 o 3 1.7799g, 0.1011g of MgO with a purity of 98.5%, the other steps were the same as in Example 1, and a potassium sodium niobate transparent ferroelectric ceramic material modified by bismuth magnesium niobate was prepared.

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Abstract

The invention discloses a bismuth magnesium niobate modified potassium sodium niobate transparent ferroelectric ceramic material and a preparation method thereof adopting low purity raw materials. The formula of the ceramic material is (1-x)(K<0.5>Na<0.5>)Nb<3-x>Bi(Mg<1 / 3>Nb<2 / 3>)O3, wherein x represents the mole number of Bi(Mg<1 / 3>Nb<2 / 3>)O3 and is in a range of 0.03 to 0.09. Low purity raw materials are used, the preparation method comprises steps of preparing raw materials, pre-burning, ball-milling, granulating, pressing, rubber discharging, pressure-free sealed sintering, polishing, and silver ink firing; the ceramic material has the advantages of high light transmission, optical isotropy, strong practicality, and easy production, moreover, the preparation method is simple, the repeatability is good, and the yield is high. The test results show that when x is equal to 0.07, the optical transmission rate of the ceramic material is 70% or more in the visible light and infrared areas, at the same time, the ceramic material has good electric properties: the maximal dielectric constant is 3337, the dielectric loss is less than 3%, the remnant polarization is 1.5 [mu]C / cm2, and the coercive field is 7.0 kV / cm.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a potassium sodium niobate transparent ferroelectric ceramic material modified by bismuth magnesium niobate and a method for preparing the ceramic material by using low-purity raw materials. Background technique [0002] Transparent ferroelectric ceramics are a class of materials that can achieve optical intensity and voltage controllability due to the nonlinear change of their refractive index under the action of an electric field, which causes optical path differences in different crystallographic directions. Lithium niobate (LiNbO 3 ) crystal is the de facto industry standard because of its large nonlinear optical coefficient and high response speed. [0003] With the development of information technology, LiNbO 3 Due to the disadvantages of low electro-optic coefficient, high temperature dependence and high cost, crystal can no longer meet the requirements of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495
CPCC04B35/495C04B2235/3201C04B2235/3206C04B2235/3251C04B2235/3298C04B2235/9653
Inventor 杨祖培张小帅晁小练魏灵灵
Owner SHAANXI NORMAL UNIV
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