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Microwave dielectric ceramics of perovskite structure and preparation method thereof

A technology of microwave dielectric ceramics and perovskite structure is applied in the field of electronic ceramics, which can solve the problems of high loss of microwave dielectric ceramics, low adjustability of dielectric constant and resonant frequency temperature coefficient, and high sintering temperature. Excellent microwave dielectric properties and the effect of reducing sintering temperature

Active Publication Date: 2019-03-08
无锡鑫圣慧龙纳米陶瓷技术有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] However, the above-mentioned microwave dielectric ceramics all have the defects of high loss, high sintering temperature, and low adjustability of dielectric constant and resonant frequency temperature coefficient.

Method used

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  • Microwave dielectric ceramics of perovskite structure and preparation method thereof
  • Microwave dielectric ceramics of perovskite structure and preparation method thereof
  • Microwave dielectric ceramics of perovskite structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] In this embodiment, a microwave dielectric ceramic with a perovskite structure is prepared according to the following method:

[0068] (1) Mix the calcium carbonate, lithium carbonate, samarium trioxide and titanium dioxide in the formula and perform a ball mill for 6 hours, dry at 110°C, pass through a 60-mesh sieve, put it into a corundum crucible and roast at 1135°C in an air atmosphere , the calcination time is 4h, to get Ca 1-z (Li 0.5 SM 0.5 ) z TiO 3 , take z=0, 0.1, 0.2, 0.3 and 0.4 respectively to carry out the above operations.

[0069] In order to investigate the effect of different z values ​​on Ca 1-z (Li 0.5 SM 0.5 ) z TiO 3 The influence of performance, on the Ca obtained in step (1) 1-z (Li 0.5 SM 0.5 ) z TiO 3 Carry out secondary ball milling for 6 hours, then add polyvinyl alcohol aqueous solution with a mass fraction of 5wt% for grinding, pass through two layers of 120 mesh sieves, press into a cylinder with a diameter of 10 mm and a hei...

Embodiment 8

[0085] In this embodiment, a microwave dielectric ceramic with a perovskite structure is prepared according to the following method:

[0086] The Ca of z=0.3 obtained by roasting in the embodiment 1 step (1) of formula quantity 0.7 (Li 0.5 SM 0.5 ) 0.3 TiO 3 Mix it with lanthanum trioxide, samarium trioxide and aluminum sesquioxide and perform a ball mill for 6 hours, dry it at 110°C, pass through a 60-mesh sieve, put it into a corundum crucible and bake it at 1220°C in an air atmosphere for 4 hours , after roasting, carry out secondary ball milling for 6 hours, then add 5wt% polyvinyl alcohol aqueous solution to grind, pass through two layers of 120 mesh sieves, press into a cylinder with a diameter of 10mm and a height of 6mm, and then carry out 1340°C under an air atmosphere. Sintering, sintering 4h into porcelain, obtain the microwave dielectric ceramics (0.68Ca 0.7 (Li 0.5 SM 0.5 ) 0.3 TiO 3 -0.32La 0.95 SM 0.05 AlO 3 ).

[0087] A microwave network analyzer ...

Embodiment 15

[0090] Example 15 and Example 16 prepared microwave dielectric ceramics with a perovskite structure according to the method of Example 8. The difference is that in step (2), the sintering temperatures are different (see Table 3 for specific temperatures), and the formulas of microwave dielectric ceramics are different. .

[0091] The microwave dielectric properties of the microwave dielectric ceramics prepared in Example 15 and Example 16 were tested using a microwave network analyzer, and the test results are shown in Table 3.

[0092] table 3

[0093]

[0094] In Table 3, CLST stands for Ca 0.7 (Li 0.5 SM 0.5 ) 0.3 TiO 3 .

[0095] It can be seen from Table 3 that in Examples 8-16, the overall performance is optimal when y=0.25.

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Abstract

The invention provides microwave dielectric ceramics of a perovskite structure and a preparation method thereof. The chemical composition of the ceramics is (1-x)Ca1-z(Li0.5Sm0.5)zTiO3-xLa1-ySmyAlO3,wherein x is greater than or equal to 0.1 and less than or equal to 0.6, y is greater than or equal to 0 and less than or equal to 1, and z is greater than or equal to 0 and less than or equal to 0.4.The preparation method comprises the following steps that 1) a calcium source, a lithium source, a samarium source and a titanium source are mixed and are subjected to primary crushing, and roastingis carried out so as to obtain Ca1-z(Li0.5Sm0.5)zTiO3; and 2) the Ca1-z(Li0.5Sm0.5)zTiO3, an aluminum source and a rare-earth metal source are mixed and then are subjected to primary crushing, roasting is carried out, secondary crushing and pressing are carried out, and sintering is carried out to form the ceramics so as to obtain the ceramics. According to the ceramics, the relative dielectric constant is adjustable, the loss is low, and the temperature coefficient of resonant frequency is adjustable.

Description

technical field [0001] The invention belongs to the field of electronic ceramics, and relates to a microwave dielectric ceramic, in particular to a microwave dielectric ceramic with a perovskite structure and a preparation method thereof Background technique [0002] In recent years, microwave dielectric ceramic materials have been widely used in communication fields such as mobile phone communication, wireless local area network, satellite live broadcast, and global positioning system. From the perspective of microwave dielectric properties, microwave dielectric ceramics for mobile communication require materials with medium dielectric constant, high quality factor and near zero temperature coefficient of resonance frequency. MTiO in Intermediate High-Q Microwave Ceramic System 3 -LnA1O 3 It has excellent microwave performance and tunable perovskite structure, so the research on this system of microwave dielectric ceramics has been increasing in recent years. [0003] Th...

Claims

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Application Information

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IPC IPC(8): C04B35/50C04B35/465
CPCC04B35/465C04B35/50C04B2235/3203C04B2235/3227C04B2235/3222C04B2235/3217C04B2235/3208C04B2235/442C04B2235/96
Inventor 吉岸王丹王晓慧金镇龙
Owner 无锡鑫圣慧龙纳米陶瓷技术有限公司
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