電気と熱の測定のための超高温真空探査機

Laurent Jalabert^1,2, Jose Ordonez-Miranda^1,2,3, Yunhui Wu²

¹LIMMS, CNRS-IIS IRL 2820, The University of Tokyo, Tokyo 153-8505, Japan.

The Review of scientific instruments

|August 25, 2025

まとめ

このシステムは,極端な条件下で同時に電気的および熱的性質の決定を可能にします.

科学分野:

材料科学
熱分析
電気的特徴

背景:

高温での材料の特性の正確な特徴付けは,高度なアプリケーションに不可欠です.
既存の方法は,極端な条件下で同時に電気と熱を測定する際にしばしば限界に直面します.

研究の目的:

電気と熱の性質を同時に測定するための超高温真空探査ステーション (UHT-VPS) の開発と検証.
大量のサファイアと薄膜のマイクロ抵抗を測定するシステムの能力を実証する.

主な方法:

シリコンカービッドヒーターから真空環境で熱放射線で加熱された無接触のサンプルホルダーを使用した.
30nV以上で電気信号を測定するために,3ω/2ωの方法を使用した.
データ分析のために最大30 kHzの温度信号を記録する.

主要な成果:

高真空 (2 × 10−6 mbar) でUHT-VPSを66時間連続で300Kから1150Kまで成功させた.
クロミウム/プラチナのマイクロレジスタンスに対する線形および二次温度係数
熱伝導性と熱拡散性を測定し,光学的な方法では熱伝導性が測定できない.

結論:

UHT-VPSは,前例のない温度レベルでの材料の電気的および熱的性質を同時に取得するための効果的なソリューションを提供します.
極端な条件下で長期にわたる安定した測定を行う能力は,材料研究におけるその有用性を証明しています.

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