DIFFERENTIAL THERMAL-ANALYSIS OF INDIVIDUAL SPECIMENS BY THERMAL EMF-MEASUREMENT

被引：6

作者：

RIESS, I ^{[1
]}

SAFADI, R ^{[1
]}

ZILBERSTEIN, E ^{[1
]}

TULLER, HL ^{[1
]}

机构：

[1] MIT,DEPT MAT SCI & ENGN,CAMBRIDGE,MA 02139

来源：

JOURNAL OF APPLIED PHYSICS | 1991年 / 69卷 / 03期

关键词：

D O I：

10.1063/1.347305

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The thermal electromotive force (EMF) generated across a specimen owing to a small nonuniformity in the sample's temperature is used to follow phase transitions in the specimen. As the temperature is scanned, a first-order phase transition yields a sharp S-shaped peak in the EMF versus time, t, and temperature, T(t), curves. A transition to a superconducting state exhibits a sharp drop in EMF as was observed during measurements on YBa2Cu3O7. The dependence of the EMF on time and temperature is calculated for a first-order phase transition. Predictions are confirmed by experiment. This method is therefore useful for detecting phase transition temperatures. A practical feature of this measurement is the ability to precisely calibrate, in situ, the temperature measuring element, e.g., thermometer or thermocouple, when the transition temperature is already known.

引用

页码：1205 / 1215

页数：11

共 5 条

[1] DIRECT THERMAL EVIDENCE FOR A FIRST-ORDER CHANGE AT SPIN-FLIP TRANSITION CHROMIUM [J].