Ba1-xSrxTiO3-Mg2TiO4 two-phase composite ceramic material and its preparing process

A ba1-xsrxtio3-mg2tio4, composite ceramic technology, applied in the field of two-phase composite ceramic materials, can solve the problems of mutual restriction of dielectric tunability, not being well solved, etc., and achieve high dielectric tunable characteristics and cost. Low, simple process effect

Inactive Publication Date: 2007-08-01
TONGJI UNIV
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Problems solved by technology

Dong Xianlin et al. in BST ceramic materials and Mg 2 SiO 4 -MgO composites have also done some research work, and the contradiction between the dielectri

Method used

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  • Ba1-xSrxTiO3-Mg2TiO4 two-phase composite ceramic material and its preparing process
  • Ba1-xSrxTiO3-Mg2TiO4 two-phase composite ceramic material and its preparing process
  • Ba1-xSrxTiO3-Mg2TiO4 two-phase composite ceramic material and its preparing process

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preparation example Construction

[0030] The preparation method of the two-phase composite ceramic material provided by the present invention specifically comprises the following steps:

[0031] (1) Using the traditional electronic ceramic powder preparation process, through the solid-state reaction method, select BaTiO 3 and SrTiO 3 (99.9%, 100nm, provided by Shandong Guoteng Functional Ceramic Material Co., Ltd.) as the main raw material, according to a certain Ba / Sr molar ratio ingredients, the prepared raw materials are placed in a nylon ball mill jar, and zirconia balls and absolute ethanol or Ball mill with deionized water for 20 to 24 hours, pre-calcine at 1100°C for 4 hours after the discharge is dried, and Ba (1-x) Sr x TiO 3 (x=0.3~0.6) powder.

[0032] (2) adopt solid phase reaction method, synthesize Mg according to following reaction equation 2 TiO 4 Powder:

[0033] 2(MgCO 3 ) 4 ·Mg(OH) 2 ·5H 2 O+5TiO 2 = 5Mg 2 TiO 4 +8CO 2 +12H 2 o

[0034] First weigh a certain molar ratio (MgC...

Embodiment 1

[0048] Example 1 # -4 # Ba obtained from the formula 0.6 Sr 0.4 TiO 3 -Mg 2 TiO 4 The X-ray diffraction analysis spectrum of two-phase composite ceramic material is as shown in Figure 1; Embodiment 1 # -4 # Ba obtained from the formula 0.6 Sr 0.4 TiO 3 -Mg 2 TiO 4 The relational curve of dielectric constant and loss and temperature of two-phase composite ceramic material is as shown in Figure 2; Embodiment 1 # -4 # Ba obtained from the formula 0.6 Sr 0.4 TiO 3 -Mg 2 TiO 4 The relationship between the dielectric constant of the two-phase composite ceramic material and the applied DC field strength is shown in Figure 3, where 1 # 70wt% Ba for BST-MT30 0.6 Sr 0.4 TiO 3 with 30wt% Mg 2 TiO 4 Composite; 2 # 60wt% Ba for BST-MT40 0.6 Sr 0.4 TiO 3 with 40wt% Mg 2 TiO 4 Composite; 3 # 40wt% Ba for BST-MT60 0.6 Sr 0.4 TiO 3 with 60wt% Mg 2 TiO 4 Composite; 4 # 30wt% Ba for BST-MT70 0.6 Sr 0.4 TiO 3 with 70wt% Mg 2 TiO 4 complex.

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Abstract

The invention discloses a two-phase composite ceramic material of being used to microwave modulator, which comprises 80.0-20.0wt% Ba(1-x)SrxTiO3(x=0.3-0.6) and 20.0-80.0wt% Mg2TiO4. The invention is characterizes by the following: adopting traditional electronic ceramic preparing craft; selecting microwave dielectric material normal magnesium titanate with good dielectric property; proceeding two-phase gradient composition with strontium titanate barium ferroelectric materials different Ba/Sr ingredient; getting the product.

Description

technical field [0001] The invention relates to a two-phase composite ceramic material which has the characteristic that the dielectric constant can be adjusted with the external DC electric field and can be used for adjustable microwave devices. Background technique [0002] Barium strontium titanate is a typical ferroelectric material with perovskite structure, which has excellent dielectric properties such as high dielectric constant, low dielectric loss and nonlinear adjustable dielectric constant under the action of DC electric field, and Its Curie temperature can be continuously adjusted in a wide range with the Ba / Sr ratio. Therefore, barium strontium titanate ceramic materials have received increasing attention as microwave tunable devices (such as phase shifters, filters, variable capacitors, and delay lines, etc.), especially as microwave phase shifters. hotspot. In 1994, L.C.Sengupta of the Materials Department of the US National Military Research Laboratory and...

Claims

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Application Information

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IPC IPC(8): C04B35/462C04B35/465C04B35/468C04B35/47C04B35/622
Inventor 翟继卫丑修建孙建英
Owner TONGJI UNIV
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