a mgtio 3 Microwave-based dielectric ceramics and preparation method thereof

A microwave dielectric ceramic, 2sm1 technology, applied in the direction of ceramics, inorganic insulators, etc., can solve the problems of lower sintering temperature, high sintering temperature, poor temperature stability, etc., improve the temperature coefficient of resonance frequency, simple preparation process, and broad application prospects Effect

Active Publication Date: 2021-09-07
苏州同拓光电科技有限公司
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Problems solved by technology

However, it has the disadvantages of poor temperature stability (τf=–50ppm / °C) and high sintering temperature (>1400°C)
To compensate for the large resonant frequency temperature coefficient, the researchers introduced 0.95MgTiO 3 -0.05CaTiO 3 (MCT) composite system (K.Wakino.Recent developments ofdielectric resonator materials and filters.Ferroelectrics,1989,91:69–86.), but the Q×f value decreased significantly (εr=21, Q×f=56000GHzτf= 0ppm / ℃), while the sintering temperature is still high (~1350℃)
Subsequent research work mainly focused on the low-temperature sintering of the MCT system. The researchers achieved a reduction in the sintering temperature of the MCT system through a variety of glass phases and composite dopants (C.-L.Huang and M.-H.Weng.Improved high Q values ​​of MgTiO 3 -CaTiO 3 microwave dielectric ceramics at low sintering temperatures.Material Research Bulletin.2001,36:2741–2750.), but the Q×f value drops sharply, which is not conducive to practical device applications

Method used

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  • a mgtio <sub>3</sub> Microwave-based dielectric ceramics and preparation method thereof
  • a mgtio <sub>3</sub> Microwave-based dielectric ceramics and preparation method thereof
  • a mgtio <sub>3</sub> Microwave-based dielectric ceramics and preparation method thereof

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Effect test

Embodiment 1

[0024] Will analyze pure raw materials MgO, TiO 2 , GeO 2 According to Mg(Ti 0.995 Ge 0.005 )O 3 The stoichiometric ratio was weighed and the ingredients were weighed, then the above powder was put into a ball mill jar, after adding deionized water and zirconia grinding balls, the ball mill jar was sealed, and wet ball milled on a roller mill for 12 hours. The ball-milled raw materials were dried in a drying oven at 100°C, and passed through an 80-mesh sieve after drying. The sieved ceramic powder was put into a crucible and calcined at 900° C. for 3 hours. According to the chemical formula 0.95Mg(Ti 0.995 Ge 0.005 )O 3 -0.05Ca 0.99 (K 1 / 2 SM 1 / 2 ) 0.01 TiO 3 will analyze pure raw CaCO 3 、TiO 2 、K 2 CO 3 、Sm 2 o 3Mix with the calcined powder, add deionized water and zirconium dioxide grinding balls, material: water: ball = 1:2:4, and ball mill on a vertical planetary ball mill for 4 hours. The ball-milled raw materials were placed in a drying oven and drie...

Embodiment 2

[0026] Will analyze pure raw materials MgO, TiO 2 , GeO 2 According to Mg(Ti 0.99 Ge 0.01 )O 3 The stoichiometric ratio weighs the ingredients, then puts the above powder into a ball mill jar, adds deionized water and zirconium dioxide grinding balls, seals the ball mill jar, and wet ball mills on a roller mill for 16 hours. The ball-milled raw materials were dried in a drying oven at 110°C, and passed through a 100-mesh sieve after drying. The sieved ceramic powder was put into a crucible and calcined at 950° C. for 4 hours. According to the chemical formula 0.95Mg(Ti 0.99 Ge 0.01 )O 3 -0.05Ca 0.98 (K 1 / 2 SM 1 / 2 ) 0.02 TiO 3 Raw material CaCO 3 、TiO 2 、K 2 CO 3 、Sm 2 o 3 Mix the ingredients with the calcined powder, add deionized water and zirconium dioxide grinding balls, material: water: ball = 1.5:2:5, and ball mill on a vertical planetary ball mill for 6 hours. The ball-milled raw materials were placed in a drying oven and dried at 110°C, and passed t...

Embodiment 3

[0028] Will analyze pure raw materials MgO, TiO 2 , GeO 2 According to Mg(Ti 0.985 Ge 0.015 )O 3 Weigh the ingredients according to the stoichiometric ratio, then put the above powder into the ball mill jar, add deionized water and zirconium dioxide grinding balls, seal the ball mill jar, and wet ball mill on the roller mill for 24 hours. The ball-milled raw materials were dried in a drying oven at 120°C, and passed through a 150-mesh sieve after drying. The sieved ceramic powder is put into a crucible and calcined at 1000°C for 3-5 hours. According to the chemical formula 0.95Mg(Ti 0.985 Ge 0.015 )O 3 -0.05Ca 0.97 (K 1 / 2 SM 1 / 2 ) 0.03 TiO 3 Raw material CaCO 3 、TiO 2 、K 2 CO 3 、Sm 2 o 3 Mix with the calcined powder, add deionized water and zirconium dioxide grinding balls, material: water: ball = 1:2:6, and ball mill on a vertical planetary ball mill for 8 hours. The ball-milled raw materials were placed in a drying oven and dried at 120°C, and passed throu...

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Abstract

The present invention disclosed a MGTIO 3 Base microwave medium ceramics, MGTIO 3 The chemical formula of base microwave medium ceramics is 0.95mg (TI 1‑x GE x ) O 3 ‑0.05ca 1‑y K 1 / 2 SM 1 / 2 Cure y TIO 3 , 0 <x ≤0.02, 0 <y ≤ 0.05, the main crystal phase is mgtio 3 Catio 3 EssenceThe present invention also provides MGTIO 3 Preparation of base microwave medium ceramics.MGTIO of the present invention 3 Base microwave medium ceramic, high Q value, resonant frequency coefficient near zero adjustment, low -fever sintering temperature (<1200 ° C).

Description

technical field [0001] The invention relates to the technical field of electronic information functional materials and devices, in particular to a MgTiO 3 Microwave-based dielectric ceramics and preparation methods thereof. Background technique [0002] The rapid development of 5G mobile communication puts forward higher requirements for microwave components, and at the same time, the market demand for high-performance microwave dielectric materials is increasing. Compared with traditional metal cavity resonators, dielectric resonators made of microwave dielectric ceramics have the advantages of small size, good temperature stability, wide source, and low price, and have gradually replaced metal resonators. Therefore, microwave dielectric ceramics with high quality factor, near-zero resonance frequency temperature coefficient and low sintering temperature have become one of the important materials required for 5G mobile communication applications. [0003] In many microwav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B3/12C04B35/465
CPCC04B35/465C04B2235/3224C04B2235/3287C04B2235/442C04B2235/6562C04B2235/6565C04B2235/96
Inventor 王咏
Owner 苏州同拓光电科技有限公司
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