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Ceramics Surface and Interface Group

Ceramics have surface, interface and grains. Especially, the surface and interface (grain boundary) in ceramics show the electrical properties. Our group focuses on the surface and interface as reaction field during the sintering to fabricate the oxide with poor sinterability and stability in air. In order to achieve above purpose, we used soft-chemical method, solid-state reaction method, and ion beam techniques. By the integration of the information on ceramics fabrication, we proceed with a basic ceramics science.

Objective

The research target is to fabricate the dense ceramics such as SnO2, La2O3, In2O3 and Ga2O3 etc. These materials are well known as the semiconductor and dielectric materials. For example, SnO2 and In2O3 are the sensor materials, and show the poor sinterability. La2O3 has a problem on the stability under the humidity atmosphere. We synthesize the dense ceramics and use them the target for rf- sputtering and PLD methods. Finally, we measure the electrical properties such as gas sensing and dielectrical constant.


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Zn diffusion phenomena in dense SnO2 ceramics. This data is helpful to evaluate the evaporation, solubility limit and diffusion of Zn.


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2H distribution in dense SnO2 doped with ZnO. The concentration and diffusion path of 2H were determined.


Facilities

Secondary ion mass spectrometry. This instrument is used for trace element detection, isotope analysis and H analysis.(Fig. 1)

Ion implantation. This instrument can implant as much as 20 metal ions as well as gas.(Fig. 2)






"Fig. 1" Image

Fig. 1


"Fig. 2" Image

Fig. 2




Selected Recent Results

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SEM photograph of ZnO particles having a unique shape synthesized by sof-chemical method. Various shapes can be synthesized.


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This is a sensor characteristic of ethanol gas obtained from pyramid shaped ZnO particles.


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This is the response characteristic of hydrogen and ethanol of sputtered SnO2 films. Dense SnO2 ceramics doped with ZnO was used as the target.


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This is the composition at the most surface layer of ZnO doped SnO2 thin film. This is helpful to understand the sensor response of ethanol and hydrogen gases.


Group Leader

Inquiry about this page

Ceramics Surface and Interface Group
1-1 Namiki, Tsukuba, Ibaraki, 305-0044 JAPAN
TEL: +81-29-860-4434
E-Mail: SAKAGUCHI.Isao=nims.go.jp(Please change "=" to "@")
National Institute for Materials Science (NIMS)
1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, JAPAN
TEL.+81-(0)-29-859-2000
FAX.+81-(0)-29-859-2029