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The in-situ high-temperature XRD reaction cell is used for in-situ XRD testing and characterization of atmospheric and high-temperature gas-solid chemical reactions, with beryllium window/polyimide film as the window material; Equipped with a temperature controller/Joule heating power supply, it generates high temperature and effectively exchanges heat with the sample stage and samples inside the sample stage. The temperature of the samples in the reaction tank is controlled through a temperature control system; Equipped with a cooling circulation system and a circulating water cooler, the reaction tank shell is cooled and cooled through low-temperature circulating coolant.