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Barium strontium titanate base electro-optical composite material and preparation method thereof

A technology of strontium barium titanate and composite materials, which is applied in the field of strontium barium titanate-based electro-optical composite materials and its preparation, can solve the problems of lower dielectric constant, higher sintering temperature, lower adjustability, etc., and achieve a dielectric constant The effect of low, high insulation resistance and high adjustability

Active Publication Date: 2008-08-20
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these two composite materials have two major shortcomings: (1) With the increase of oxide addition, while the dielectric constant decreases, the adjustability decreases more seriously; (2) The sintering temperature is higher, Usually between 1350°C and 1450°C, and the sintering temperature increases with the increase of oxide addition

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1, with powdered BaCO 3 , SrCO 3 、TiO 2 、Me 2 Si 3 o 8 and MO as raw materials, respectively prepare Ba according to the stoichiometric ratio 1-x Sr x TiO 3 (x=0.4) and Me 2 SiO 4 , after 24 hours of wet ball milling, the material was discharged and dried, and the powder was pre-calcined at 1150°C for 2 hours to obtain Ba 0.6 Sr 0.4 TiO 3 and Me 2 SiO 4 Powder; according to (1-y-z)Ba 1-x Sr x TiO 3 +yMe 2 SiO 4 +zMO (wherein x=0.4, y=14wt.%, z=6wt.%) proportioning, wet ball milling for 24h; discharging, drying, adding 6wt.% of PVA to granulate, and powder under the pressure of 100Mpa Body compression molding; debinding at 800°C / 2h, sintering at 1320°C / 2h. After firing, the samples are finely ground, ultrasonically cleaned, and then silver electrodes are applied, which can be used for dielectric property testing. The electrical properties of sample 1 are shown in Table 1. figure 1 The dielectric constant of sample 1 as a function of temperatu...

Embodiment 2

[0029] Embodiment 2, according to (1-y-z) Ba 1-x Sr x TiO 3 +y Me 2 SiO 4 +zMO (where x=0.4, y=25wt.%, z=10wt.%) is prepared in proportion, and the specific process is the same as that of Example 1. The electrical properties of sample 2 are shown in Table 2. image 3 The dielectric constant of sample 2 is given as a function of temperature, Figure 4 The variation curve of the dielectric constant of sample 2 with the bias voltage is given.

[0030] Embodiment 2 Sample 2 electrical properties

[0031] Composition

Embodiment 3

[0032] Embodiment 3, according to (1-y-z)Ba 1-x Sr x TiO 3 +yMe 2 SiO 4 +zMO (wherein x=0.4, y=35wt.%, z=15wt.%) is prepared in proportion, and the specific process is the same as that of Example 1. The electrical properties of sample 3 are shown in Table 3. Figure 5 The dielectric constant of sample 3 is given as a function of temperature, Figure 6 The variation curve of the dielectric constant of sample 3 with the bias voltage is given.

[0033] Embodiment 3 Sample 3 electrical properties

[0034] Composition

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Abstract

The invention relates to a barium strontium titanate base electro-optical composite material and preparation method, wherein the composition of these material being (1-y-z)Ba1-xSrxTiO3+yMe2SiO4+zMO, wherein x=0-0.75, y=5-60 wt%, z=0-30 wt%, y+z=5-60 wt%, the preparation comprises formulating Ba1-xSrxTiO3 and Mg2SiO4 by chemical measuring ratio, ball grinding, discharging, drying, pre-burning, thus obtaining Ba1-xSrxTiO3 and Mg2SiO4 powder, then mixing Me2SiO4 and MO into BSTO powder according to the designed composition, then carrying out ball grinding, drying, granulating, modeling, discharging adhesive, then calcining 2-4h at the furnace temperature of 1250-1350 deg. C, naturally cooling to obtain the needed samples.

Description

technical field [0001] The invention relates to a barium strontium titanate-based electro-optic composite material and a preparation method thereof, belonging to the field of electro-optic materials. Background technique [0002] At present, the materials used as phase shifters are mainly ferrite and PIN diodes, but they all have some major disadvantages, for example, the peak power consumption of ferrite phase shifters is large, and the transmission speed is limited; the temperature compensation circuit cannot Avoid causing pointing errors of the phased array antenna; the control circuit and compensation circuit not only make the phase shifter itself bulky, but also cause the reliability of the phased array antenna to decrease; the manufacturing process is complicated and the production cost is high. PIN diode phase shifters are less expensive than ferrite phase shifters, but high insertion loss limits their use. Therefore, both ferrite phase shifters and PIN diode phase s...

Claims

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Application Information

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IPC IPC(8): C04B35/462C04B35/468C04B35/47C04B35/622C04B35/64
Inventor 陈莹董显林
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI