Dielectric adjustable Ba[1-x]SrxTiO3-MgAl2O4 diphase composite microwave ceramic material and preparation method thereof

A microwave ceramic and dielectric technology, applied in the field of two-phase composite microwave ceramic materials, achieves the effects of excellent performance, simple process and low cost

CN101265085BInactive Publication Date: 2012-01-25TONGJI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2012-01-25
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention belongs to the technology field of electronic materials and devices, and discloses a two-phase composite microwave ceramic material with adjustable dielectric property, Ba(1-x)SrxTiO3-MgAl2O4, and a production method thereof. The two-phase composite microwave ceramic material contains the following components according to mass percentage: 40.0-95.0 wt% of Ba(1-x)SrxTiO3 (x is in the range of 0.3-0.9) and 5.0-60.0 wt% of MgAl2O4. The inventive two-phase composite microwave ceramic material is characterized in adjustable dielectric property and low dielectric loss (high Q value) in microwave frequency band, and can be used for adjustable microwave devices.
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Description

technical field

[0001] The invention belongs to the technical field of electronic materials and devices, and in particular relates to a two-phase composite microwave ceramic material. Background technique

[0002] Perovskite structure Ba with high dielectric constant, low dielectric loss, nonlinear tunable dielectric constant and tunable Curie temperature 1-x Sr x TiO 3 Ferroelectric materials have attracted increasing attention as microwave tunable devices (such as phase shifters, filters, variable capacitors, and delay lines, etc.), especially as microwave phase shifters. In 1994, L.C.Sengupta of the Materials Department of the US National Military Research Laboratory and W.C.Drach of the Microwave and Optoelectronics Department of the US Military Research Laboratory submitted a survey of "Electrical Properties of Barium Strontium Titanate (BST) Phase Shifter Materials" to the US military department. The report pointed out that if BST ferroelectric materials can replace...

Examples

Embodiment 1

[0040] Example 1 # -5 # (1-x)Ba prepared by the formula 0.4 Sr 0.6 TiO 3 -xMgAl 2 o 4 The X-ray diffraction analysis pattern of the two-phase composite microwave ceramic material is as follows: figure 1 As shown, the results show that Ba 0.4 Sr 0.6 TiO 3 and MgAl 2 o 4 Pure two-phase forms coexist without other impurity phases; Example 1 # -5 # (1-x)Ba prepared by the formula 0.4 Sr 0.6 TiO 3 -xMgAl 2 o 4 The relationship between the dielectric constant and loss of the two-phase composite microwave ceramic material and temperature is as follows: figure 2 As shown, the results show that with MgAl 2 o 4 With the increase of content, the Curie peak moves to high temperature and is broadened and suppressed; Example 1 # -5 # (1-x)Ba prepared by the formula 0.4 Sr 0.6 TiO 3 -xMgAl 2 o 4 The relationship between the dielectric constant and loss of the two-phase composite microwave ceramic material and the applied DC field strength is as follows: image 3 A...

Embodiment 6

[0041] Embodiment 6 prepares (1-x) Ba 0.7 Sr 0.3 TiO 3 -xMgAl 2 o 4 Two-phase composite microwave ceramic materials:

[0042] According to Ba 0.7 Sr 0.3 TiO 3 The stoichiometric ratio, weighed 163.259g BaTiO 3 and 55.055 g SrTiO 3 (99.90%, 100nm, provided by Shandong Guoci Functional Ceramic Material Co., Ltd.) The powder is placed in a nylon ball mill jar, zirconia balls and absolute ethanol or deionized water are added, ball milled for 24 hours, and dried at 1100 ° C after discharging. ~1250℃ for 4 hours, after grinding to get Ba 0.7 Sr 0.3 TiO 3 The powder is ready for use. In addition, weigh 10.228g MgO and 25.493g Al respectively 2 o 3 Put the powder in a nylon ball mill jar, add zirconia balls and anhydrous ethanol or deionized water, mill for 24 hours, and pre-calcine at 1250°C to 1450°C for 4 hours after discharging, and then grind to obtain MgAl 2 o 4 The powder is ready for use.

[0043] Take by weighing the above-mentioned synthesized Ba respectivel...

Embodiment 7

[0047] Embodiment 7 prepares (1-x) Ba 0.1 Sr 0.9 TiO 3 -xMgAl 2 o 4 Two-phase composite microwave ceramic materials:

[0048] According to Ba 0.1 Sr 0.9 TiO 3 The stoichiometric ratio, weigh 23.323g BaTiO 3 and 167.865 g SrTiO 3 (99.90%, 100nm, provided by Shandong Guoci Functional Ceramic Material Co., Ltd.) The powder is placed in a nylon ball mill jar, zirconia balls and absolute ethanol or deionized water are added, ball milled for 24 hours, and dried at 1100 ° C after discharging. ~1250℃ for 4 hours, after grinding to get Ba 0.1 Sr 0.9 TiO 3 The powder is ready for use. In addition, weigh 10.228g MgO and 25.493g Al respectively 2 o 3 Put the powder in a nylon ball mill jar, add zirconia balls and anhydrous ethanol or deionized water, mill for 24 hours, and pre-calcine at 1250°C to 1450°C for 4 hours after discharging, and then grind to obtain MgAl 2 o 4 The powder is ready for use.

[0049] Take the above-mentioned synthesized Ba respectively according to...