Applications of Moissanite Anvil Cell for Raman Spectroscopy under High-Temperature and High-Pressure
DUAN Ti-yu1,2，SUN Qiang1，ZHENG Hai-fei1*
1. School of Earth and Space Science, Peking University, Beijing 100871, China 2. National Jewelry Quality Supervision and Inspection Center of China, Beijing 100101, China
Abstract：This paper introduces the structure and the feature of moissanite anvil cell, which is composed of moissanite anvil, supporting and creating pressure system, heater system and metal gasket. Because of its high hardness, high heat conductance, low thermal expansion, good thermal stability and low price, moissanite is a good material of anvil for high-temperature and high-pressure experimental studies. With this cell, the Raman spectrum of sodium carbonate solution, sodium sulfate solution and distilled water has been in situ measured under high-temperature and high-pressure. With increasing pressure, it can be observed that the 1 066 cm-1 Raman modes of sodium carbonate solution and the 982 cm-1 Raman modes of sodium sulfate solution shift to high wave numbers obviously. With increasing temperature, the frequency at maximum intensity shifts to high wave numbers, the full width at half-maximum intensity decreases in the Raman spectrum of water.
Key words：High-temperature and high-pressure;Moissanite anvil cell;Raman spectrum;In-situ measurement
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