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Thermal conductivity tensor of NbO2

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Title: Thermal conductivity tensor of NbO2
Authors: Cho, Hai Jun Browse this author
Kim, Gowoon Browse this author
Onozato, Takaki Browse this author
Jeen, Hyoungjeen Browse this author
Ohta, Hiromichi Browse this author →KAKEN DB
Issue Date: Jul-2019
Publisher: Elsevier
Journal Title: International journal of heat and mass transfer
Volume: 137
Start Page: 263
End Page: 267
Publisher DOI: 10.1016/j.ijheatmasstransfer.2019.03.135
Abstract: Among several transition metal oxides showing metal to insulator transition, NbO2 has attracted attention as the active material of memory devices due to its high thermal stability. Although clarification of thermal conductivity (kappa) is essentially important for optimizing the NbO2 device performance, it has not been reported thus far probably due to the anisotropic crystal structure. Here we show the thermal conductivity tensor of NbO2 crystal. We measured the thermal conductivities of (1 1 0)-, (0 0 1)-, and (1 1 1) oriented NbO2 films and found (1 I 1)-direction shows similar to 1 W m(-1) K-1 higher thermal conductivity compared with the other directions (-3 W m(-1) K-1). Using the measured kappa-values, we successfully determined thermal conductivity tensor components kappa(11), kappa(13), and kappa(33). The diagonal components of the thermal conductivity tensor were similar to 2.5 W m(-1) K-1 while the nonzero off-diagonal component was 1 W m(-1) K-1. We believe that the present results are of great value in optimizing the performance of NbO2 based devices. (C) 2019 Elsevier Ltd. All rights reserved.
Rights: © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Hai Jun CHO

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