Abstract

Nanocrystalline hafnium dioxide has been synthesized by hydrothermal treatment of X-ray amorphous hydrated hafnium dioxide in distilled water at 120–260°C for 1–7 days and in the presence of NaCl and NaOH as mineralizing agents. The size of HfO₂ crystallites has been shown to be determined by the temperature of hydrothermal treatment and the type of mineralizing agent. The size of HfO₂ crystallites obtained in alkaline medium is by 2–3 times smaller than that for HfO₂ crystallites obtained in neutral medium and constitutes ~8 nm. Dispersing of nanocrystalline HfO₂ obtained by hydrothermal treatment in water in the presence of dextrane and poly(vinylpyrrolidone) under exposure to ultrasound leads to preparation of stable sols of nanocrystalline HfO₂.

中文翻译：

---

水热法合成纳米晶HfO 2水溶液

摘要

纳米晶二氧化ha是通过将X射线无定形水合二氧化ha在蒸馏水中于120–260°C并在NaCl和NaOH作为矿化剂的条件下进行水热处理而合成的。已经显示出HfO ₂晶体的尺寸由水热处理的温度和矿化剂的类型确定。在碱性介质中获得的HfO ₂晶体的尺寸比在中性介质中获得的HfO ₂晶体的尺寸小2-3倍，约8 nm。纳米HfO _2的分散在超声作用下，在右旋糖酐和聚乙烯吡咯烷酮的存在下，通过在水中进行水热处理而获得的纳米晶，可以制备稳定的纳米晶态HfO ₂溶胶。