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High Q value microwave dielectric ceramic with adjustable temperature coefficient of resonance frequency

A technology of microwave dielectric ceramics and temperature coefficient, which is applied in the field of high-Q microwave dielectric materials and preparation, can solve the problems of large temperature coefficient of resonant frequency and low quality factor, and achieve high ceramic density, simple preparation process and excellent performance Effect

Inactive Publication Date: 2019-06-21
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the existing microwave dielectric ceramics, such as low quality factor and large temperature coefficient of resonance frequency, and provide a high-Q microwave dielectric ceramic material with adjustable resonance frequency temperature coefficient

Method used

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  • High Q value microwave dielectric ceramic with adjustable temperature coefficient of resonance frequency
  • High Q value microwave dielectric ceramic with adjustable temperature coefficient of resonance frequency

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Ingredients: using analytically pure raw materials, Li 2 CO 3 、TiO 2 , MgO, Nb 2 o 5 Press Li 2-2x+y Ti 1-x-4y (Mg x Nb y ) 3 o 3 , where x=0.022, x:y=1:2 ingredients, mixed with absolute ethanol and ball milled for 6 hours, then dried;

[0018] (2) Pre-calcination: pass the dried powder in step (1) through a 40-mesh sieve, and pre-calcine at 800°C for 7 hours to obtain Li 2-2x+y Ti 1-x-4y (Mg x Nb y ) 3 o 3 Solid particles;

[0019] (3) Secondary ball milling: Li 2-2x+y Ti 1-x-4y (Mg x Nb y ) 3 o 3 The solid particles were granulated by adding a PVA aqueous solution with a concentration of 7wt%, and then ball milled twice in absolute ethanol for 12 hours;

[0020] (4) Tablet pressing: after drying the powder obtained in step (3), pass through an 80-mesh sieve to obtain powder, and press it into a green body under a pressure of 2 MPa.

[0021] (5) Sintering: sinter the green body, heat up to 200°C for 1 hour to remove crystal water, heat up to...

Embodiment 2

[0023] (1) Ingredients: using analytically pure raw materials, Li 2 CO 3 、TiO 2 , MgO, Nb 2 o 5 Press Li 2-2x+y Ti 1-x-4y (Mg x Nb y ) 3 o 3 , where x=0.022, x:y=1:3 ingredients, mixed with absolute ethanol and ball milled for 6 hours, then dried;

[0024] (2) Pre-calcination: pass the dried powder in step (1) through a 40-mesh sieve, and pre-calcine at 800°C for 7 hours to obtain Li 2-2x+y Ti 1-x-4y (Mg x Nb y ) 3 o 3 Solid particles;

[0025] (3) Secondary ball milling: Li 2-2x+y Ti 1-x-4y (Mg x Nb y ) 3 o 3 The solid particles were granulated by adding a PVA aqueous solution with a concentration of 7wt%, and then ball milled twice in absolute ethanol for 12 hours;

[0026] (4) Tablet pressing: after drying the powder obtained in step (3), pass through an 80-mesh sieve to obtain powder, and press it into a green body under a pressure of 2 MPa.

[0027] (5) Sintering: Sinter the green body, heat up to 200°C for 1 hour to remove crystal water, heat up to...

Embodiment 3

[0029] (1) Ingredients: using analytically pure raw materials, Li 2 CO 3 、TiO 2 , MgO, Nb 2 o 5 Press Li 2-2x+y Ti 1-x-4y (Mg x Nb y ) 3 o 3 , where x=0.022, x:y=1:1 ingredients, mixed with absolute ethanol and ball milled for 6 hours, then dried;

[0030] (2) Pre-calcination: pass the dried powder in step (1) through a 40-mesh sieve, and pre-calcine at 800°C for 7 hours to obtain Li 2-2x+y Ti 1-x-4y (Mg x Nb y ) 3 o 3 Solid particles;

[0031] (3) Secondary ball milling: Li 2-2x+y Ti 1-x-4y (Mg x Nb y ) 3 o 3 The solid particles were granulated by adding a PVA aqueous solution with a concentration of 7wt%, and then ball milled twice in absolute ethanol for 12 hours;

[0032] (4) Tablet pressing: after drying the powder obtained in step (3), pass through an 80-mesh sieve to obtain powder, and press it into a green body under a pressure of 2 MPa.

[0033] (5) Sintering: Sinter the green body, heat up to 200°C for 1 hour to remove crystal water, heat up to 5...

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Abstract

The invention discloses high Q value microwave dielectric ceramic with adjustable temperature coefficient of resonance frequency. The high Q value microwave dielectric ceramic has chemical formula: Li(2-2x+y)Ti(1-x-4y)(MgxNby)3O3, wherein x=0.022, and x:y=(1-3):(1-3). Li2CO3, TiO2, MgO and Nb2O5 are prepared according to the chemical formula, the mixture is pre-sintered at the temperature of 800 DEG C after ball milling, drying and sieving, regranulation is performed, secondary ball milling is performed, and a green body is prepared through pressing; the green body is sintered at the temperature of 1,200-1,280 DEG C, and the compact high Q value microwave dielectric ceramic is prepared. Compared with pure-phase Li2TiO3, the dielectric constant of the system has is not changed significantly, epsilon r is 17.3-20.2, the Q*f value is increased by about 125% to the highest extent, and the temperature coefficient of resonance frequency is adjustable. The preparation process is simple, the process is environmentally friendly, and the ceramic is excellent in performance and is a prospective high Q value microwave dielectric ceramic.

Description

technical field [0001] The invention belongs to a dielectric material composition characterized by components, in particular to a Li 2 TiO 3 High-Q microwave dielectric material with adjustable temperature coefficient of fundamental resonance frequency and preparation method thereof. Background technique [0002] Microwave dielectric ceramic refers to a new type of functional ceramic material used in microwave frequency band circuits (300MHz ~ 300GHz), which has good microwave dielectric properties such as high quality factor, moderate dielectric constant, and small temperature coefficient of resonance frequency. With the development of microwave communication technology to the millimeter wave band, higher requirements are put forward for the quality factor and resonant frequency temperature coefficient of microwave dielectric ceramics. [0003] J.J.Bian proposed in 2009 that in Li 2 TiO 3 doped with Nb 2 o 5 , so that Nb 5+ to Li + and Ti 4+ substituted at the same...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/626
Inventor 李玲霞倪立争于仕辉杜明昆许振鹏
Owner TIANJIN UNIV
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