Method for preparing dielectric tunable complex-phase microwave ceramic material by hydrothermal method through in-situ synthesis

A technology of microwave ceramics and in-situ compounding, which is applied in the direction of circuits, electrical components, piezoelectric/electrostrictive/magnetostrictive devices, etc., can solve the problems of low interface bonding strength, coarse particles, thermodynamic instability, etc., and achieve easy Effect of grain size, low production cost, and improved microwave performance

Inactive Publication Date: 2014-05-21
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the shortcomings of coarse particles, thermodynamic instability, and low interfacial bonding strength in the preparation of composite materials by kneading two phases, in-situ composite technology has emerged in recent years, that is, under certain conditions, one or Several enhanced phases, so as to achieve the purpose of strengthening

Method used

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  • Method for preparing dielectric tunable complex-phase microwave ceramic material by hydrothermal method through in-situ synthesis
  • Method for preparing dielectric tunable complex-phase microwave ceramic material by hydrothermal method through in-situ synthesis
  • Method for preparing dielectric tunable complex-phase microwave ceramic material by hydrothermal method through in-situ synthesis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] One part of 0.0075mol of BaCl 2 and SrCl 2 , 0.0300mol of MgCl 2 , a part of 0.0060mol of BaCl 2 and SrCl 2 , 0.0360mol of MgCl 2 , a part of 0.0045mol BaCl 2 and SrCl 2 , 0.0420mol of MgCl 2 , were dissolved in 30ml deionized water to prepare Ba, Sr, Mg solutions; 0.0300molC 16 h 36 o 4 Ti is dissolved in 0.0600molC 5 h 8 o 2 Form the Ti solution in the middle; Mix the three kinds of Ba, Sr and Mg solutions prepared above with the Ti solution respectively, stir evenly, and prepare (1-x)Ba 1-n Sr n TiO 3 -xMg 2 TiO 4 (x=0.5, 0.6 and 0.7) precursor solution; then the KOH solution formed by dissolving 0.3000mol KOH in 100ml deionized water was dropped into (1-x) Ba 1-n Sr n TiO 3 -xMg 2 TiO 4 (x=0.5, 0.6 and 0.7) precursor solution, mixed and stirred to prepare 160ml, poured into a 200ml hydrothermal kettle and reacted hydrothermally at a temperature of 180°C for 24 hours, washed and filtered to obtain powder;

[0040] BaCl 2 , SrCl 2 , MgCl 2 、C ...

Embodiment 2

[0044] A portion of 0.0075mol of Ba(NO) 2 and Sr(NO) 2 , 0.0300mol of Mg(NO) 2 , a 0.0060mol Ba(NO) 2 and Sr(NO) 2 , 0.0360mol of Mg(NO) 2 , a 0.0045mol Ba(NO) 2 and Sr(NO) 2 , 0.0420mol of Mg(NO) 2 , were dissolved in 30ml deionized water to prepare Ba, Sr, Mg solutions; 0.0300molC 16 h 36 o 4 Ti is dissolved in 0.0600molC 5 h 8 o 2 Form the Ti solution in the middle; Mix the three kinds of Ba, Sr and Mg solutions prepared above with the Ti solution respectively, stir evenly, and prepare (1-x)Ba 1-n Sr n TiO 3 -xMg 2 TiO 4 (x=0.5, 0.6 and 0.7) precursor solution; then the KOH solution formed by dissolving 0.3000mol KOH in 100ml deionized water was dropped into (1-x) Ba 1-n Sr n TiO 3 -xMg 2 TiO 4 (x=0.5, 0.6 and 0.7) precursor solution, mixed and stirred to prepare 160ml, poured into a 200ml hydrothermal kettle and reacted hydrothermally at a temperature of 180°C for 24 hours, washed and filtered to obtain powder;

[0045] Ba(NO 3 ) 2 , Sr(NO 3 ) 2 ,...

Embodiment 3

[0049] A part of 0.0075mol of Ba(CH 3 COO) 2 and Sr(CH 3 COO) 2 , 0.0300mol of Mg(CH 3 COO) 2 , a part of 0.0060mol of Ba(CH 3 COO) 2 and Sr(CH 3 COO) 2 , 0.0360mol of Mg(CH 3 COO) 2 , a part of 0.0045mol of Ba(CH 3 COO) 2 and Sr(CH 3 COO) 2 , 0.0420mol of Mg(CH 3 COO) 2 , were dissolved in 30ml deionized water to prepare Ba, Sr, Mg solutions; 0.0300molC 16 h 36 o 4 Ti is dissolved in 0.0600molC 5 h 8 o 2 Form the Ti solution in the middle; Mix the three kinds of Ba, Sr and Mg solutions prepared above with the Ti solution respectively, stir evenly, and prepare (1-x)Ba 1-n Sr n TiO 3 -xMg 2 TiO 4 (x=0.5, 0.6 and 0.7) precursor solution; then the KOH solution formed by dissolving 0.3000mol KOH in 100ml deionized water was dropped into (1-x) Ba 1-n Sr n TiO 3 -xMg 2 TiO 4 (x=0.5, 0.6 and 0.7) precursor solution, mixed and stirred to prepare 160ml, poured into a 200ml hydrothermal kettle and reacted hydrothermally at a temperature of 180°C for 24 hour...

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Abstract

The invention relates to the technical field of electronic functions, in particular to a method for preparing a dielectric tunable complex-phase microwave ceramic material by a hydrothermal method through in-situ synthesis. The dielectric tunable complex-phase microwave ceramic material which is prepared by the method for preparing the dielectric tunable complex-phase microwave ceramic material by the hydrothermal method through in-situ synthesis has the chemical general formula (1-x)Ba1-nSrnTiO3-xMg2TiO4, wherein n is more than 0 and less than or equal to 0.8, and x is more than 0 and less than 1; the method comprises the following steps of: preparing a Ba, Sr and Mg solution and a Ti solution; uniformly stirring the Ba, Sr and Mg solution and the Ti solution to prepare a (1-x)Ba1-nSrnTiO3-xMg2TiO4 precursor solution; and dripping a KOH aqueous solution into the precursor solution, heating and reacting, washing, and suction-filtering to obtain powder. A preparation process is simple, and the prepared complex-phase ceramic is low in thermal stress, low in production cost and suitable to be produced commercially and has few defects.

Description

technical field [0001] The invention relates to the technical field of electronic functions, in particular to a method for in-situ composite preparation of dielectrically tuned multiphase microwave ceramic materials by a hydrothermal method. Background technique [0002] Barium titanate-based ferroelectric materials (such as Ba 1-n Sr n TiO 3 (BST), BaZr 1-n Ti n o 3 (BZT)) have a high dielectric tuning rate and have potential applications in dielectrically tuned microwave devices. Especially BST ferroelectric materials, because of their relatively low microwave loss, have attracted the attention of many researchers. The United States is at the forefront of the research on BST ferroelectric phase shifters in the world. Among them, the BST ferroelectric phase shifters designed and developed by AgileMaterials&Technologies Inc. and Paratek Microwave Inc., compared with traditional GaAs and MEMS-based phase shifters, not only greatly reduce cost, and reduce size and energ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/187C04B35/465C04B35/468C04B35/47C04B35/622
Inventor 翟继卫张景基沈波
Owner TONGJI UNIV
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