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Ozone Gas Generator Using Uniaxially Polarized LiTaO3 Single Crystal

Published online by Cambridge University Press:  01 February 2011

Nakanishi Yoshikazu ,
Junko Ide ,
Jun Kondo ,
Shinji Fukao ,
Katsumi Handa ,
Tatsunori Tochio ,
Yoshiaki Ito ,
Akikazu Tanaka  and
Shinzo Yoshikado
Nakanishi Yoshikazu
Affiliation:
nakanishiga@yahoo.co.jp, Doshisha University, Department of Electronics, 1-3, Tatara-Miyakodani, Kyotanabe, Kyoto, 610-0321, Japan, +81-774-65-6328, +81-774-65-6801
Junko Ide
Affiliation:
yosi@elec.kuicr.kyoto-u.ac.jp, Kyoto University, Institute for Chemical Research, Gokasyo, Uji, Kyoto, 611-0011, Japan
Jun Kondo
Affiliation:
syoshika@mail.doshisha.ac.jp, Kyoto University, Institute for Chemical Research, Gokasyo, Uji, Kyoto, 611-0011, Japan
Shinji Fukao
Affiliation:
eth1101@mail4.doshisha.ac.jp, Doshisha University, Department of Electronics, 1-3, Tatara-Miyakodani, Kyotanabe, Kyoto, 610-0321, Japan
Katsumi Handa
Affiliation:
yosi@elec.kuicr.kyoto-u.ac.jp, Kyoto University, Institute for Chemical Research, Gokasyo, Uji, Kyoto, 611-0011, Japan
Tatsunori Tochio
Affiliation:
tochi@elec.kuicr.kyoto-u.ac.jp, Keihanna Interaction Plaza Incorporated, 1-7, Hikaridai, Seika-cyo, Soraku-gun, Kyoto, 619-0237, Japan
Yoshiaki Ito
Affiliation:
yosi@elec.kuicr.kyoto-u.ac.jp, Kyoto University, Institute for Chemical Research, Gokasyo, Uji, Kyoto, 611-0011, Japan
Akikazu Tanaka
Affiliation:
yosi@elec.kuicr.kyoto-u.ac.jp, Sumitomo Metal Mining Co. Ltd., 5-11-3, Shinbashi, Minato-ku, Tokyo, 105-8716, Japan
Shinzo Yoshikado
Affiliation:
syoshika@mail.doshisha.ac.jp, Doshisha University, Department of Electronics, 1-3, Tatara-Miyakodani, Kyotanabe, Kyoto, 610-0321, Japan
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Abstract

The phenomenon that a ferroelectrics crystal carries out intrinsic polarization by the temperature change generally is known. The Ozone gas generation was investigated due to a strong electric field of this crystal under atmospheric pressure . When we added a rapid temperature change to the crystal, the charge non–equilibrium occurs around the crystal. Oxygen is influenced due to the non-equilibrium in charge and ozone is considered to be generated. Therefore, we used the high electric field induced due to the polarization of a ferroelectrics crystal in order to produce the ozone under atmospheric pressure.

As a result, we were able to produce ozone of the density of 400ppb in a oxygen gas flow of 1.5 liters per minute using this simple system: The crystals (Yamaju Co. Ltd. and Sumitomo metal mining Co. Ltd.) are used in thickness of 3, 5, 7, 10, 20, and 30 mm with a diameter of 4 inches, respectively. They are poled crystals.

Experiments on the maximum temperature (300 degree), the temperature gradient (100 degree/10 minite), and substrate materials(Cu and Al), the thickness of the crystal, and z face etc. were carried out during the temperature of LiTaO3 single crystal from 20C to about 300C. It is found that the amount of the ozone production increases rapidly, when the maximum temperature of LiTaO3 single crystal is raised and have a relation with the thickness of the crystal. However, the amount of the ozone production doesn't closely related with the X-ray generation that we use the crystal for.

In the present study, when the thickness of the crystal became large, polarization voltage became high, but generated efficiency of ozone was not necessarily proportional to thickness.

Keywords

ferroelectricityx-ray fluorescenceelectron irradiation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1034 , 2007 , 1034-K10-62
Copyright
Copyright © Materials Research Society 2008

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