Rare earth oxide doped and modified barium zirconate titanate dielectric adjustable ceramic material and its preparation method

A technology of rare earth oxides and barium zirconate titanate, which is applied in circuits, electrical components, piezoelectric/electrostrictive/magnetostrictive devices, etc., can solve problems such as limited applications, unsatisfactory temperature stability of withstand voltage characteristics, etc. , to achieve the effects of high dielectric adjustability, superior temperature stability, and good withstand voltage characteristics

Inactive Publication Date: 2007-08-01
TONGJI UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, the dielectric materials used in dielectric tunable devices mainly focus on the research of barium strontium titanate material system, but its withstand voltage characteristics of adjusting the dielectric constant under the action of an external DC electric field and its temperature stability in the paraelectric phase are not good. These are all limiting its application in the field of dielectric tunable devices to a certain extent.

Method used

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  • Rare earth oxide doped and modified barium zirconate titanate dielectric adjustable ceramic material and its preparation method
  • Rare earth oxide doped and modified barium zirconate titanate dielectric adjustable ceramic material and its preparation method

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Embodiment Construction

[0020] According to Ba 1-x m x (Ti 1-y-0.25x Zr y )O 3 The stoichiometric ratio, weigh BaCO according to Table 1 3 , ZrO 2 and TiO 2 and rare earth oxide M 2 o 3 Powder, the specific formula is shown in Table 1. After mixing, put it in a nylon ball mill jar, add zirconia balls and absolute ethanol or deionized water, zirconia balls and BaCO 3 , ZrO 2 、TiO 2 and M 2 o 3 The mass ratio of the mixture is 1.2~1.5:1; absolute ethanol or deionized water and BaCO 3 , ZrO 2 、TiO 2 and M 2 o 3 The mass ratio of the mixture is 1.5 to 3.0:1, ball milled for 24 hours, and then pre-calcined at 1100°C to 1300°C for 2 to 4 hours after discharging and drying, and Ba 1-x m x (Ti 1-y-0.25x Zr y )O 3 Powder.

[0021] Table 1. Unit: grams

[0022] final product molecular formula

[0023]

[0024] Put the mixture of the above formulas into a nylon ball mill jar, add zirconia balls and absolute ethanol ball mill for 24 hours, zirconia balls and BaCO 3 ,...

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Abstract

The invention discloses an electric adjustable ceramic material of barium zirconate titanate of doped modified rare earth oxide as well as making method, whose molecular formula is Ba1-xMx (Ti1-y-0.25xZry) O3, wherein N is rare earth element; x is between 0.001 and 0.05; y is 0.1-0.5.

Description

technical field [0001] The invention relates to a barium zirconate titanate dielectric adjustable ceramic material doped and modified by rare earth oxides and a preparation method thereof Background technique [0002] Barium titanate-based ferroelectric materials have excellent dielectric properties with non-linearly adjustable dielectric constant under the action of an applied DC electric field. Electric constant, and then control the wave velocity and wavelength of electromagnetic waves, in order to achieve the change of phase displacement. Microwave circuits designed with tunability of ferroelectric materials are generally called tunable ferroelectric microwave devices, including phase shifters, tunable bandpass and bandstop filters, voltage-controlled resonators, etc. Utilizing the electrical nonlinearity of ferroelectric ceramic materials is also an important technical approach to realize passive tunable microwave devices. The development of barium titanate-based ceram...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/49C04B35/622H01L41/187
Inventor 翟继卫丑修建
Owner TONGJI UNIV
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