A low-temperature giant dielectric antiferromagnetic ceramic material and its preparation and application

A ceramic material and giant dielectric technology, applied in the field of low-temperature giant dielectric antiferromagnetic ceramic materials, to achieve low dielectric loss, excellent giant dielectric properties, and simple preparation methods

Active Publication Date: 2022-01-18
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the defects of the prior art, the purpose of the present invention is to provide a ceramic material with stable giant dielectric properties and antiferromagnetic properties at low temperature or even ultra-low temperature environment, aiming at solving the lack of existing technology when the temperature is lower than 50K It is still a very stable giant dielectric material to meet the technical problems of working requirements in some low temperature or even ultra-low temperature environments (such as aerospace, ultra-low temperature electronic storage, etc.)

Method used

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  • A low-temperature giant dielectric antiferromagnetic ceramic material and its preparation and application
  • A low-temperature giant dielectric antiferromagnetic ceramic material and its preparation and application
  • A low-temperature giant dielectric antiferromagnetic ceramic material and its preparation and application

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preparation example Construction

[0031] The present invention also provides the preparation method of the ceramic material, comprising the following steps: drying the ceramic powder composition, mixing it with a binder and granulating it, and then pressing it into a tablet to obtain a green embryo; The embryo is sintered after debinding at high temperature to obtain the ceramic material; the sintering temperature is 1300-1500°C.

[0032] In some embodiments, the ceramic powder is prepared according to the following steps:

[0033] (1) SnO 2 Powder, CoO powder, Ta 2 o 5 After the powder is weighed and mixed according to a certain molar ratio, it is put into a ball mill tank with zirconium balls as the medium with deionized water according to the mass ratio of 1-2:1, and ball milled with a planetary ball mill at a speed of 350-550 rpm 2 to 4 hours;

[0034] (2) Pour the ball-milled slurry into an enamel dish that has been cleaned in advance, and put it into an oven at 120°C for drying;

[0035] (3) Take ou...

Embodiment 1

[0040] An ultra-low temperature giant dielectric antiferromagnetic SnO 2 The ceramic material is prepared according to the following method:

[0041] 1. Ingredients, drying, pre-burning

[0042] According to CoO: SnO 2=1.67%:98.33% molar ratio carries out compounding. Put the weighed material and deionized water into a ball mill tank with zirconium balls as the medium in a ratio of 3:2, and use a planetary ball mill to mill at a rate of 350 rpm for 3 hours; pour the milled slurry into Put it into the enamel dish that has been washed in advance, and dry it in an oven at 120°C.

[0043] 2. Granulation and dry pressing

[0044] Take out the dried powder and grind to make the powder thinner, then add 6wt% PVA (concentration is 8%) as binder, grind evenly again, cross 60 mesh sieves to obtain fine particles; The powder is pressed into a cylindrical green body with a diameter of 7 mm and a height of about 1 to 2 mm by using a 7 mm mold on a tablet press with a pressure of 100 M...

Embodiment 2

[0048] Basically the same as Example 1, the difference is that the ultra-low temperature giant dielectric antiferromagnetic SnO 2 The composition of ceramic materials varies, as follows:

[0049] The molar ratio of each component is: CoO: Ta 2 o 5 : SnO 2 = 1%: 1%: 97%.

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Abstract

The invention belongs to the technical field of functional ceramic materials, and more specifically relates to a low-temperature giant dielectric antiferromagnetic ceramic material and its preparation and application. The ceramic material is made of SnO 2 The base ceramic powder material is obtained by sintering, the SnO 2 The base ceramic powder material includes the main component SnO 2 The powder also includes a modifying agent, the modifying agent is a transition metal oxide powder, and the molar ratio of the modifying agent in the ceramic powder composition is lower than 10%. The ceramic material has stable giant dielectric properties, low dielectric loss and antiferromagnetism at a temperature lower than 50K.

Description

technical field [0001] The invention belongs to the technical field of functional ceramic materials, and more specifically relates to a low-temperature giant dielectric antiferromagnetic ceramic material and its preparation and application. Background technique [0002] With the advent of the information age, electronic and microelectronic technologies are developing rapidly. As one of the core basic materials of these technologies, functional ceramic materials, because of their optical, electrical, magnetic, acoustic, thermal and other Electricity, ferroelectricity, piezoelectricity, and pyroelectricity are widely used in many microelectronic devices such as capacitors, filters, and sensors. As an important member of functional ceramic materials, dielectric ceramic materials have also received extensive attention. As an important component of large-capacity capacitors and dynamic random access memory devices, giant dielectric ceramic materials have received extensive atten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/457C04B35/622
CPCC04B35/457C04B35/622C04B2235/3275C04B2235/3251
Inventor 傅邱云董文马琪
Owner HUAZHONG UNIV OF SCI & TECH
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