A high-temperature high-pressure cell equipped with a metallic window was developed for small-angle neutron scattering (SANS). The feasibility of a Ti alloy (Ti–6Al–4V) as a candidate window material was assessed, considering its mechanical strength and neutron characteristics. SANS experiments should be conducted using safe and reliable materials without risk of window damage or leakage of the activated samples due to window breakage. SANS profiles measured for supercritical heavy water showed maximum scattering intensity at temperatures and pressures near the critical density. Additionally, the utility of the cell for observations of the decomposition of plastic in supercritical water is presented. The cell facilitates analysis of reaction mechanisms under sub- and supercritical conditions, which could provide detailed information to aid efficient decomposition and recycling, contributing to a sustainable society.

中文翻译：

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用于研究超临界水中水热反应的高温高压小角中子散射池

开发了一种配备金属窗口的高温高压室，用于小角中子散射（SANS）。考虑到钛合金（Ti-6Al-4V）的机械强度和中子特性，评估了钛合金（Ti-6Al-4V）作为候选窗口材料的可行性。 SANS 实验应使用安全可靠的材料进行，不会有窗口损坏或因窗口破裂而导致活化样品泄漏的风险。对超临界重水测量的 SANS 曲线显示，在接近临界密度的温度和压力下，散射强度最大。此外，还介绍了该电池在观察超临界水中塑料分解的用途。该电池有助于分析亚临界和超临界条件下的反应机制，这可以提供详细信息以帮助有效分解和回收，为可持续发展的社会做出贡献。