Neodymium niobate ceramic having improved microwave dielectric characteristic by substituting neodymium ions with lanthanum ions

A microwave dielectric and neodymium ion technology is applied in the field of neodymium niobate ceramics and its preparation, and achieves the effects of simple preparation process, environmental protection, and uniform and smooth surface.

Inactive Publication Date: 2015-05-27
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few reports on its preparation method and modification.

Method used

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  • Neodymium niobate ceramic having improved microwave dielectric characteristic by substituting neodymium ions with lanthanum ions
  • Neodymium niobate ceramic having improved microwave dielectric characteristic by substituting neodymium ions with lanthanum ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. According to the microwave dielectric ceramic composition (Nd 1-x La x )NbO 4 (x=0.01), weigh Nd 2 O 3 -5.5318g, La 2 O 3 -0.0541g, Nb 2 O 5 -4.4141g ingredients, 10g in total; put the mixed powder into a polyester tank, add 160ml deionized water and 150g zirconium balls, and then ball mill on a planetary ball mill for 6 hours, the ball mill speed is 1000 rpm;

[0024] 2. Place the ball-milled raw materials in a drying box, dry at 120°C and pass through a 40-mesh sieve to obtain a powder with uniform particles;

[0025] 3. Calcining the powder at 900°C for 4 hours;

[0026] 4. Put the calcined powder into a polyester tank, ball mill it for 6 hours, and dry it after discharging, and pass through a 40-mesh sieve; then add 6% by weight paraffin wax as a binder for granulation, and Pass through an 80-mesh sieve; then use a powder tableting machine to compress a body with a diameter of 10mm and a thickness of 5mm at a pressure of 7MPa;

[0027] 5. The green body is sintered at 12...

Embodiment 2

[0030] 1. According to the microwave dielectric ceramic composition (Nd 1-x La x )NbO 4 (x=0.02), weigh Nd 2 O 3 -5.4769g, La 2 O 3 -0.1082g, Nb 2 O 5 -4.4149g ingredients, 10g in total; put the mixed powder into a polyester tank, add 160ml deionized water and 150g zirconium balls, and then ball mill on a planetary ball mill for 6 hours, the ball mill speed is 1000 rpm;

[0031] 2. Place the ball-milled raw materials in a drying box, dry at 120°C and pass through a 40-mesh sieve to obtain a powder with uniform particles;

[0032] 3. Calcining the powder at 900°C for 4 hours;

[0033] 4. Put the calcined powder into a polyester tank, ball mill it for 6 hours, and dry it after discharging, and pass through a 40-mesh sieve; then add 6% by weight paraffin wax as a binder for granulation, and Pass through an 80-mesh sieve; then use a powder tableting machine to compress a body with a diameter of 10mm and a thickness of 5mm at a pressure of 7MPa;

[0034] 5. The green body is sintered at 12...

Embodiment 3

[0037] 1. According to the microwave dielectric ceramic composition (Nd 1-x La x )NbO 4 (x=0.03), weigh Nd 2 O 3 -5.4220g, La 2 O 3 -0.1624g, Nb 2 O 5 -4.4156g of ingredients, 10g in total; add the mixed powder to a polyester tank, add 160ml of deionized water and 150g of zirconium balls, and then ball mill on a planetary ball mill for 6 hours at a speed of 1000 rpm;

[0038] 2. Place the ball-milled raw materials in a drying box, dry at 120°C and pass through a 40-mesh sieve to obtain a powder with uniform particles;

[0039] 3. Calcining the powder at 900°C for 4 hours;

[0040] 4. Put the calcined powder into a polyester tank, ball mill it for 6 hours, and dry it after discharging, and pass through a 40-mesh sieve; then add 6% by weight paraffin wax as a binder for granulation, and Pass through an 80-mesh sieve; then use a powder tableting machine to compress a body with a diameter of 10mm and a thickness of 5mm at a pressure of 7MPa;

[0041] 5. The green body is sintered at 1250°...

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Abstract

The invention discloses neodymium niobate ceramic having improved microwave dielectric characteristic by substituting neodymium ions with lanthanum ions. The formula of the neodymium niobate ceramic is (Nd1-xLax)NbO4, in the formula, x is less than or equal to 0.1. The preparation method of the neodymium niobate ceramic comprises the following steps: firstly, preparing Nd2O3, La2O3 and Nb2O5 according to the chemical formula, ball-milling, drying, screening, and calcining for 4 hours at 900-1000 DEG C; pelleting, pressing to form a blank, and sintering at 1225-1300 DEG C, thereby obtaining the neodymium niobate ceramic. As lanthanum ions are adopted to substitute Nd on the A site in NdNbO4, the microwave dielectric property can be improved, the dielectric constant of the neodymium niobate ceramic is 21.52, the quality factor of the neodymium niobate ceramic is 45600GHz, and the resonance frequency temperature coefficient of the neodymium niobate ceramic is up to 0ppm / DEG C. The neodymium niobate ceramic is simple in preparation process, environment-friendly in process and is a microwave medium material with a good application prospect.

Description

Technical field [0001] The invention belongs to a ceramic composition characterized by components, and particularly relates to a neodymium niobate ceramic in which lanthanum ions replace neodymium ions to improve microwave dielectric properties and a preparation method thereof. Background technique [0002] With the development of microwave communication technology, microwave dielectric materials have attracted more and more attention. The materials that can be used in microwave devices should mainly meet the following three parameters, which are high dielectric constant and high quality factor. And near zero temperature coefficient of resonance frequency, and these three parameters correspond to the size, operating frequency and thermal stability of the device made of materials. In terms of practical application, it is mainly in the radar and global positioning system working in the microwave frequency band. [0003] Rare earth niobate (LnNbO 4 ) Is a series of microwave dielectr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622
Inventor 张平赵永贵
Owner TIANJIN UNIV
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