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首页> 外文会议>Conference on X-Ray and Gamma-Ray Detectors and Applications IV, Jul 7-9, 2002, Seattle, Washington, USA >The Color of Red Mercuric Iodide at Cryogenic Temperatures
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The Color of Red Mercuric Iodide at Cryogenic Temperatures

机译：低温下红色碘化汞的颜色

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摘要

We investigated a red to yellow color change observed in α-HgI_2 when cooled below 150 K. A phase transformation to β-HgI_2, which has a yellow color, was ruled out by a variable temperature x-ray diffraction study. Instead the color change at cryogenic temperatures is caused by a shift in the transmission edge to shorter wavelengths which we attribute to a widening band gap at low temperatures. Using optical transmission spectroscopy the width of the band gap was measured between 10 and 330 K. At room temperature the gap was 2.11 +- 0.03 eV which is significantly smaller than the most recently published values of ～ 2.3 eV. This smaller band gap was further verified by measuring the thermoelectric current at elevated temperatures.
机译：我们研究了冷却至150 K以下时在α-HgI_2中观察到的红色到黄色的变化。通过可变温度X射线衍射研究排除了向黄色的β-HgI_2的相变。取而代之的是，低温下的颜色变化是由透射边缘向较短波长的偏移引起的，这归因于低温下带隙的扩大。使用光透射光谱法测量的带隙宽度在10到330 K之间。在室温下，该带隙为2.11±-0.03 eV，明显小于最新发表的〜2.3 eV的值。通过测量高温下的热电流进一步验证了该较小的带隙。

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