Skip to main content Accessibility help
×
Home
Hostname: page-component-99c86f546-8r8mm Total loading time: 0.187 Render date: 2021-11-28T21:42:39.737Z Has data issue: true Feature Flags: { "shouldUseShareProductTool": true, "shouldUseHypothesis": true, "isUnsiloEnabled": true, "metricsAbstractViews": false, "figures": true, "newCiteModal": false, "newCitedByModal": true, "newEcommerce": true, "newUsageEvents": true }

Thermoelectrical properties of α phase and γ phase NaxCo2O4 ceramics prepared by spark plasma sintering method

Published online by Cambridge University Press:  23 January 2013

Natsuko Mikami
Affiliation:
Department of Materials Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 287-8510
Keishi Nishio
Affiliation:
Department of Materials Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 287-8510
Koya Arai
Affiliation:
Department of Materials Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 287-8510
Tatsuya Sakamoto
Affiliation:
Department of Materials Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 287-8510
Masahiro Minowa
Affiliation:
SWCC Showa Cable Systems Co., Ltd., LTD, 4-1-1 Minami-Hashimoto Chuo-Ku Sagamihara, Kanagawa, Japan
Tomoyuki Nakamura
Affiliation:
SWCC Showa Cable Systems Co., Ltd., LTD, 4-1-1 Minami-Hashimoto Chuo-Ku Sagamihara, Kanagawa, Japan
Naomi Hirayama
Affiliation:
Department of Materials Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 287-8510
Yasuo Kogo
Affiliation:
Department of Materials Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 287-8510
Tsutomu Iida
Affiliation:
Department of Materials Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 287-8510
Get access

Abstract

The thermoelectrical properties of α and γ phases of NaxCo2O4 having different amounts of Na were evaluated. The γ NaxCo2O4 samples were synthesized by thermal decomposition in a metal-citric acid compound, and the α NaxCo2O4 samples were synthesized by self-flux processing. Dense bulk ceramics were fabricated using spark plasma sintering (SPS), and the sintered samples were of high density and highly oriented. The thermoelectrical properties showed that γ NaxCo2O4 had higher electrical conductivity and lower thermal conductivity compared with α NaxCo2O4 and that α NaxCo2O4 had a larger Seebeck coefficient. These results show that γ NaxCo2O4 has a larger power factor and dimensionless figure of merit, ZT, than α NaxCo2O4.

Type
Articles
Copyright
Copyright © Materials Research Society 2013 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Terasaki, I., Sasago, Y. and Uchinokura, K., Phys. Rev. B, 1997, 56, 12685 CrossRef
Yakabe, H., Fujita, K., Nakamura, K. and Kikuchi, K., Proc. 17th Int. Conf. on Thermoelectric, (Nagoya, Japan, 1998) pp. 567569.Google Scholar
Terasaki, I., Sasago, Y. and Uchinokura, K., Proc.17th Int. Conf. on Thermoelectric, (Nagaya, Japan, 1998) pp. 564569 Google Scholar
Yakabe, H., Kikuchi, K., Terasaki, I., Sasago, Y. and Uchinokura, K., Proc. 16th Int. Conf. on Thermoelectric. (Dresden, Germany, 1997) pp. 523527.hiGoogle Scholar
Terasaki, I., Ishii, Y., Tanaka, D., Takahata, K. and Iguchi, Y.: Jpn. J. Appl. Phy. 40 (2001) L65L67 CrossRef
Motohashi, T., Naujails, E., Ueda, R., Isawa, K., Karppinen, M. and Ya-mauchi, H., Appl. Phys. Lett. 79, 1480 (2001).CrossRef
Nishio, Keishi, Takahashi, Kazuma, Inaba, Yusuke, Sakamoto, Mariko, Iida, Tsutomu, Tokiwa, Kazuyasu, Kogo, Yasuo, Yasumori, Atsuo, Watanabe, Tsuneo, 23rd International Conference on Thermoelectrics-ITC2004 in Adelaide (Australia) Proceedings CD (Paper No. #97), Released (2005)

Send article to Kindle

To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

Thermoelectrical properties of α phase and γ phase NaxCo2O4 ceramics prepared by spark plasma sintering method
Available formats
×

Send article to Dropbox

To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

Thermoelectrical properties of α phase and γ phase NaxCo2O4 ceramics prepared by spark plasma sintering method
Available formats
×

Send article to Google Drive

To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

Thermoelectrical properties of α phase and γ phase NaxCo2O4 ceramics prepared by spark plasma sintering method
Available formats
×
×

Reply to: Submit a response

Please enter your response.

Your details

Please enter a valid email address.

Conflicting interests

Do you have any conflicting interests? *