{"created":"2022-02-01T06:40:55.810313+00:00","id":2011296,"links":{},"metadata":{"_buckets":{"deposit":"35b2fcd0-5378-47fb-b22a-94cd3651cb47"},"_deposit":{"id":"2011296","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"2011296"},"status":"published"},"_oai":{"id":"oai:u-ryukyu.repo.nii.ac.jp:02011296","sets":["1642838163960:1642838338003","1642838403551:1642838406414"]},"author_link":[],"item_1617186331708":{"attribute_name":"Title","attribute_value_mlt":[{"subitem_1551255647225":"Simultaneous structure and carrier tuning of dimorphic clathrate Ba_8Ga_<16>Sn_<30>","subitem_1551255648112":"en"}]},"item_1617186419668":{"attribute_name":"Creator","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Suekuni, K.","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Avila, M. A.","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Umeo, K.","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Fukuoka, H.","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Yamanaka, S.","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Nakagawa, T.","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Takabatake, T.","creatorNameLang":"en"}]}]},"item_1617186476635":{"attribute_name":"Access Rights","attribute_value_mlt":[{"subitem_1522299639480":"open access","subitem_1600958577026":"http://purl.org/coar/access_right/c_abf2"}]},"item_1617186499011":{"attribute_name":"Rights","attribute_value_mlt":[{"subitem_1522650717957":"ja","subitem_1522651041219":"©2008 American Physical Society"}]},"item_1617186626617":{"attribute_name":"Description","attribute_value_mlt":[{"subitem_description":"We report structural, transport, and thermal properties of carrier-tuned Ba_8Ga_<16>Sn_<30> single crystals with the type-1 clathrate structure (β phase), demonstrating that Ba_8Ga_<16>Sn_<30> is a unique thermoelectric clathrate material wherein both the structure type and the carrier type are tunable. The results are compared with the properties of the better known type-8 structure (α phase) and of A_8Ga_<16>Ge_<30> (A=Sr,Eu). Differential thermal analysis and powder x-ray diffraction show that both phases are stable up to their virtually identical melting point of 520±3 °C. Refinements of single-crystal x-ray diffraction data indicate that the Ba(2) guest ion in the tetrakaidecahedron occupies the off-center 24k sites which are 0.43–0.44 Å away from the centered 6d site. The temperature-linear coefficient of the specific heat is 29 mJ/mol K^2 for both n- and p-type carriers in the β phase, four times larger than that for the α phase, suggesting contributions from tunneling of the Ba(2) guest ions between off-center minima. Analysis of specific heat with a soft-potential model (SPM) gives a characteristic energy of 20 K for the Ba(2) vibration, significantly lower than 50 K for the α phase and in fact the lowest among type-1 clathrates. The lattice thermal conductivities κL for the β phase with both charge carrier types are very similar and show a glasslike temperature dependence. This behavior in κL(T) is also described using SPM analysis, where it is found that the coupling strength between guest modes and acoustic phonons for the β phase is significantly larger than that for Sr_8Ga_<16>Ge_<30>.","subitem_description_type":"Other"},{"subitem_description":"論文","subitem_description_type":"Other"}]},"item_1617186643794":{"attribute_name":"Publisher","attribute_value_mlt":[{"subitem_1522300295150":"en","subitem_1522300316516":"American Physical Society"}]},"item_1617186702042":{"attribute_name":"Language","attribute_value_mlt":[{"subitem_1551255818386":"eng"}]},"item_1617186783814":{"attribute_name":"Identifier","attribute_value_mlt":[{"subitem_identifier_type":"HDL","subitem_identifier_uri":"http://hdl.handle.net/20.500.12000/47496"}]},"item_1617186920753":{"attribute_name":"Source Identifier","attribute_value_mlt":[{"subitem_1522646500366":"ISSN","subitem_1522646572813":"2469-9950"},{"subitem_1522646500366":"ISSN","subitem_1522646572813":"2469-9969"}]},"item_1617186941041":{"attribute_name":"Source Title","attribute_value_mlt":[{"subitem_1522650068558":"en","subitem_1522650091861":"Physical Review B"}]},"item_1617187056579":{"attribute_name":"Bibliographic Information","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2008-06-25","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"23","bibliographicVolumeNumber":"77"}]},"item_1617258105262":{"attribute_name":"Resource Type","attribute_value_mlt":[{"resourcetype":"journal article","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_1617265215918":{"attribute_name":"Version Type","attribute_value_mlt":[{"subitem_1522305645492":"VoR","subitem_1600292170262":"http://purl.org/coar/version/c_970fb48d4fbd8a85"}]},"item_1617353299429":{"attribute_name":"Relation","attribute_value_mlt":[{"subitem_1522306287251":{"subitem_1522306382014":"DOI","subitem_1522306436033":"https://doi.org/10.1103/PhysRevB.77.235119"}},{"subitem_1522306287251":{"subitem_1522306382014":"DOI","subitem_1522306436033":"https://doi.org/10.1103/PhysRevB.77.235119"}}]},"item_1617605131499":{"attribute_name":"File","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_access","filename":"PhysRevB.77.235119.pdf","mimetype":"application/pdf","url":{"objectType":"fulltext","url":"https://u-ryukyu.repo.nii.ac.jp/record/2011296/files/PhysRevB.77.235119.pdf"},"version_id":"d4dfacaf-c985-4308-8cf3-8e567180fa28"}]},"item_title":"Simultaneous structure and carrier tuning of dimorphic clathrate Ba_8Ga_<16>Sn_<30>","item_type_id":"15","owner":"1","path":["1642838338003","1642838406414"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2020-12-15"},"publish_date":"2020-12-15","publish_status":"0","recid":"2011296","relation_version_is_last":true,"title":["Simultaneous structure and carrier tuning of dimorphic clathrate Ba_8Ga_<16>Sn_<30>"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-08-03T05:31:12.278153+00:00"}