{"title":"NaCo/ sub2 /O/ sub4 /及其相关氧化物的物理性质:作为热电材料的强相关层状氧化物","authors":"I. Terassaki","doi":"10.1109/ICT.1999.843454","DOIUrl":null,"url":null,"abstract":"Since we unexpectedly discovered a large thermoelectric power for NaCO/sub 2/O/sub 4/ in 1996, we have been searching a possibility to synthesize a new thermoelectric material using 3d transition metal oxides. In some transition-metal oxides called \"strongly correlated systems\", the Coulomb repulsion between electrons is strong enough to break down a conventional band picture. Thus, in such a case, the material parameters can exceed the limitation of band calculations, and we hope that NaCo/sub 2/O/sub 4/ is indeed the case. Further investigation has revealed that NaCo/sub 2/O/sub 4/ shows unusually low thermal conductivity, possibly owing to the disorder in the Na layer. This indicates that the layered structure is as important for the thermoelectric performance as the strong correlation.","PeriodicalId":253439,"journal":{"name":"Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1999-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":"{\"title\":\"Physical properties of NaCo/sub 2/O/sub 4/ and the related oxides: strongly correlated layered oxides as thermoelectric materials\",\"authors\":\"I. Terassaki\",\"doi\":\"10.1109/ICT.1999.843454\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Since we unexpectedly discovered a large thermoelectric power for NaCO/sub 2/O/sub 4/ in 1996, we have been searching a possibility to synthesize a new thermoelectric material using 3d transition metal oxides. In some transition-metal oxides called \\\"strongly correlated systems\\\", the Coulomb repulsion between electrons is strong enough to break down a conventional band picture. Thus, in such a case, the material parameters can exceed the limitation of band calculations, and we hope that NaCo/sub 2/O/sub 4/ is indeed the case. Further investigation has revealed that NaCo/sub 2/O/sub 4/ shows unusually low thermal conductivity, possibly owing to the disorder in the Na layer. This indicates that the layered structure is as important for the thermoelectric performance as the strong correlation.\",\"PeriodicalId\":253439,\"journal\":{\"name\":\"Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407)\",\"volume\":\"50 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1999-08-29\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"2\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407)\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/ICT.1999.843454\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Eighteenth International Conference on Thermoelectrics. Proceedings, ICT'99 (Cat. No.99TH8407)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ICT.1999.843454","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Physical properties of NaCo/sub 2/O/sub 4/ and the related oxides: strongly correlated layered oxides as thermoelectric materials
Since we unexpectedly discovered a large thermoelectric power for NaCO/sub 2/O/sub 4/ in 1996, we have been searching a possibility to synthesize a new thermoelectric material using 3d transition metal oxides. In some transition-metal oxides called "strongly correlated systems", the Coulomb repulsion between electrons is strong enough to break down a conventional band picture. Thus, in such a case, the material parameters can exceed the limitation of band calculations, and we hope that NaCo/sub 2/O/sub 4/ is indeed the case. Further investigation has revealed that NaCo/sub 2/O/sub 4/ shows unusually low thermal conductivity, possibly owing to the disorder in the Na layer. This indicates that the layered structure is as important for the thermoelectric performance as the strong correlation.