作成者 |
|
|
|
|
本文言語 |
|
出版者 |
|
|
発行日 |
|
収録物名 |
|
巻 |
|
開始ページ |
|
終了ページ |
|
出版タイプ |
|
アクセス権 |
|
JaLC DOI |
|
関連DOI |
|
関連URI |
|
関連情報 |
|
概要 |
The origin of an anomalous behavior of DC resistivity in a quasi-one-dimensional compound KFeS_2 was studied using transmission-electron-microscopy (TEM) and differential scanning calorimetry (DSC). T...he resistivity of the as-grown crystal exhibits sharp decrease around room temperature with a thermal hysteresis. However, this sharp decrease in the resistivity disappears after annealing the specimen at 300℃ for two days. A endothermic peak in DSC is found in the range of 230K-280K, which corresponds to that of the decrease in the resistivity. TEM images of as-grown specimens show larger numbers of dislocations and higher density of plain defects comparing with annealed specimens. The FeS_2 chain is supposed to be interrupted and to form "FeS_2 segment". A model based on some kind of defects relaxes to thermal equilibrium state is proposed.続きを見る
|