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Sodium potassium niobate based transparent ferroelectric ceramic material with high Curie temperature and good temperature stability and preparation method of transparent ferroelectric ceramic material

A potassium-sodium niobate-based, ferroelectric ceramic technology, applied in the field of ferroelectric ceramic materials, can solve the problems of low Curie temperature, difficulty in obtaining high Curie temperature, high dielectric constant potassium-sodium niobate-based ceramics, etc., to achieve High Curie temperature, balance of electrical and optical properties, and excellent temperature stability

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  • Abstract
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Problems solved by technology

[0004] However, in the reports on potassium-sodium niobate-based transparent ceramics, in order to obtain high transparency or high dielectric properties, when the potassium-sodium-niobate-based ceramics are modified by doping, the Curie temperature is lowered. It is difficult to obtain potassium sodium niobate-based ceramics with high Curie temperature, high dielectric constant and high transparency

Method used

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  • Sodium potassium niobate based transparent ferroelectric ceramic material with high Curie temperature and good temperature stability and preparation method of transparent ferroelectric ceramic material
  • Sodium potassium niobate based transparent ferroelectric ceramic material with high Curie temperature and good temperature stability and preparation method of transparent ferroelectric ceramic material
  • Sodium potassium niobate based transparent ferroelectric ceramic material with high Curie temperature and good temperature stability and preparation method of transparent ferroelectric ceramic material

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Embodiment 1

[0031] 1. Ingredients

[0032] According to 0.97(K 0.5 Na 0.5 )NbO 3 -0.03Ba(Zn 1 / 3 Nb 2 / 3 )O 3 The stoichiometry was weighed separately for Na with a purity of 99.99%. 2 CO 3 3.9036g of K with a purity of 99.99% 2 CO 3 5.0903g of Nb with a purity of 99.99% 2 o 5 19.9834 g of BaCO with a purity of 99.99% 3 0.8991g, purity are ZnO 0.1236g of 99.99%, mix homogeneously, raw material mixture is packed in the nylon jar, 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 24 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.

[0033] 2. Pre-burning

[0034] 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 , co...

Embodiment 2

[0046] In the batching step 1 of the present embodiment, according to 0.95 (K 0.5 Na 0.5 )NbO 3 -0.05Ba(Zn 1 / 3 Nb 2 / 3 )O 3 The stoichiometry was weighed separately for Na with a purity of 99.99%. 2 CO 3 3.7776g of K with a purity of 99.99% 2 CO 3 4.9260g of Nb with a purity of 99.99% 2 o 5 19.6123 g of BaCO with a purity of 99.99% 3 1.4806g, purity are 99.99% ZnO0.2036g, other steps are identical with embodiment 1, are prepared into 0.95(K 0.5 Na 0.5 )NbO 3 -0.05Ba(Zn 1 / 3 Nb 2 / 3 )O 3 Ceramic material.

[0047] Depend on figure 1 It can be seen that the ceramic materials prepared in Examples 1 and 2 are all pure perovskite structures. Depend on figure 2 It can be seen that the ceramic materials prepared in Examples 1 and 2 all exhibit high transparency, and their transmittance in the near-infrared region (790-2000 nm) can reach as high as 80%. Depend on Figure 3-5 It can be seen that the ceramic materials prepared in Examples 1 and 2 also have good el...

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Abstract

The invention discloses a sodium potassium niobate based transparent ferroelectric ceramic material with high Curie temperature and good temperature stability and a preparation method of transparent ferroelectric ceramic material. The general formula of the ceramic material is defined as: (1-x)K0.5Na0.5NbO3-xBa(Zn1 / 3Nb2 / 3)O3, wherein x defines a mole number of Ba(Zn1 / 3Nb2 / 3)O3, x is 0.03-0.05 in value, and the ceramic material is prepared through a high-temperature solid-state method. The preparation method is simple, good in repeatability, high in yield, good in transparency of the obtained ceramic material, good in dielectric property and high in Curie temperature; transmittance is 66%-82% (for near infrared regions), dielectric constant is 1566-1813, Curie temperature is 344-395DEG C, temperature is within the range of 30-500DEG C, the dielectric constant varies little with temperature, excellent temperature stability is achieved, ferroelectric property is achieved, remanent polarization is 2-4muC / cm<2>, and coercive field is 13-16kV / cm.

Description

technical field [0001] The invention belongs to the technical field of ferroelectric ceramic materials, and in particular relates to a potassium sodium niobate-based transparent ferroelectric ceramic material with high Curie temperature and good temperature stability and a preparation method thereof. Background technique [0002] Transparent ferroelectric ceramics are an important class of new functional materials with fierce international competition. Due to its excellent ferroelectric, mechanical properties and significant photoelectric effect, and also has the characteristics of high temperature resistance, corrosion resistance, high hardness and high transparency, this type of material is used in double-layer goggles, Transparent bulletproof composite armor for tanks, molded charge armor for rockets and other military and aviation fields occupy an extremely important position; at the same time, it also plays an important role in surface acoustic wave devices, laser modul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/88C04B35/495C04B35/622
Inventor 杨祖培柴启珍晁小练
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