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Lanthanum oxide doped and modified potassium-sodium niobate-based transparent ceramic and preparation method thereof

A potassium-sodium niobate-based, transparent ceramic technology, applied in the field of functional ceramic materials, to achieve the effects of strong practicability, easy production, and excellent performance

Active Publication Date: 2020-06-19
XIAN TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 energy storage density, the second component of the potassium-sodium niobate-based ceramics is solid-dissolved and the low melting point oxide is added. At present, the application and development of doping rare earth elements in potassium sodium niobate-based transparent ceramics needs to be further studied

Method used

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  • Lanthanum oxide doped and modified potassium-sodium niobate-based transparent ceramic and preparation method thereof
  • Lanthanum oxide doped and modified potassium-sodium niobate-based transparent ceramic and preparation method thereof
  • Lanthanum oxide doped and modified potassium-sodium niobate-based transparent ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The chemical formula of the ceramic material in this example is 0.825 (K 0.5 Na 0.5 )NbO 3 -0.175Sr 1-3x / 2 Lax (Sc 0.5 Nb 0.5 )O 3 , where x=0. The steps of its preparation method include:

[0035] (1) Ingredients

[0036] According to 0.825(K 0.5 Na 0.5 )NbO 3 -0.175Sr 1-3x / 2 La x (Sc 0.5 Nb 0.5 )O 3 , the stoichiometric ratio of x=0 weighs the raw material K 2 CO 3 、Na 2 CO 3 , Nb 2 o 5 , SrCO 3 、Sc 2 o 3 , La 2 o 3 Mix evenly, put the raw material mixture into a ball mill jar, use zirconium balls as the balls and absolute ethanol as the ball milling medium, fully mix and mill for 18 hours, and the ball milling speed is 350r / min. Dry the raw material mixture at 80°C for 1 to 2 hours, and pass through a 60-mesh sieve to obtain a mixed powder;

[0037] (2) pre-burning

[0038] The raw material mixture passed through a 60-mesh sieve in step (1) was placed in an alumina crucible, compacted with an agate rod, raised to 950°C at a heating rate of...

Embodiment 2

[0051] The chemical formula of the ceramic material in this example is 0.825 (K 0.5 Na 0.5 )NbO 3 -0.175Sr 1-3x / 2 La x (Sc 0.5 Nb 0.5 )O 3 , where x=0.01. Its preparation method repeats the preparation method of Example 1 according to the above formula to obtain the lanthanum oxide-doped potassium sodium niobate-based transparent ceramic material. The unipolar hysteresis loop diagram of the ceramic material of this embodiment measured under the electric field condition of room temperature and 150kV / cm is as follows figure 2 . The dielectric properties of the transparent ceramic material in this embodiment at room temperature are shown in Table 1.

Embodiment 3

[0053] The chemical formula of the ceramic material in this example is 0.825 (K 0.5 Na 0.5 )NbO 3 -0.175Sr 1-3x / 2 La x (Sc 0.5 Nb 0.5 )O 3 , where x=0.02. Its preparation method repeats the preparation method of Example 1 according to the above formula to obtain the lanthanum oxide-doped potassium sodium niobate-based transparent ceramic material. The unipolar hysteresis loop diagram of the ceramic material of this embodiment measured under the electric field condition of room temperature and 150kV / cm is as follows figure 2 . The dielectric properties of the transparent ceramic material in this embodiment at room temperature are shown in Table 1.

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Abstract

The invention discloses a lanthanum oxide doped and modified potassium sodium niobate-based transparent ceramic and a preparation method thereof. The preparation method comprises the following steps:proportioning according to a chemical formula of 0.825(K0. 5Na0. 5)NbO3-0.175Sr1-3x / 2Lax(Sc0. 5Nb0. 5) O3, wherein x is more than or equal to 0 and less than or equal to 0.03, performing ball millingand drying to obtain raw material powder, pressing the obtained raw material powder into sheets, and sintering at 1200-1300 DEG C to obtain the lanthanum oxide doped potassium sodium niobate-based transparent ceramic. The preparation method is simple, good in repeatability and high in yield. By doping rare earth La, the defect of performance of pure potassium-sodium niobate-based ceramic is overcome, the transmittance of the prepared lanthanum oxide-doped potassium-sodium niobate-based ceramic in a visible light region can reach 65% at most, meanwhile, the ceramic has excellent energy storagecharacteristics, the energy storage density is 2.2518 J / cm<3>, and the energy storage efficiency is 81.9%.

Description

technical field [0001] The invention belongs to the technical field of functional ceramic materials, and in particular relates to a potassium sodium niobate-based transparent ceramic doped and modified by lanthanum oxide and a preparation method thereof. Background technique [0002] Transparent ceramics are a class of new optical functional materials that have attracted much attention. Due to its excellent ferroelectricity, mechanical properties and remarkable electro-optic effect, and also has the characteristics of high temperature resistance, corrosion resistance, high hardness and high transparency, this material is used as various military armor for nuclear test personnel and flight personnel , transparent bulletproof armor of tanks, windows and fairings of infrared missiles, ignition devices of large-caliber artillery, etc., occupy an extremely important position in the military and aviation fields. At the same time, transparent ferroelectric ceramics can couple opti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/626C04B35/634B24B1/00
CPCC04B35/495C04B35/622C04B35/62615C04B35/62675C04B35/62695C04B35/63416B24B1/00C04B2235/3227C04B2235/9653C04B2235/96C04B2235/442C04B2235/3224C04B2235/6562C04B2235/6567
Inventor 戴中华郭恕璇李定妍刘卫国
Owner XIAN TECH UNIV
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