The nature of the interaction between sulphides of the rare-earth elements (RE) of the yttrium subgroup RE₂S₃ (Dy − Lu, Y) with hydrofluoric acid (concentration of 49%) was studied. Powders of RE₂S₃ compounds were obtained by the reaction between RE₂O₃ (Dy − Lu, Y) and Tb₄O₇ with a stream of H₂S and CS₂ in the 1000–1050 °C temperature range. The reaction between RE₂S₃ and HF was carried out in a glassy carbon crucible in the 21–25 °C temperature range in solution, and the precipitate was washed with H₂O and dried at 90–100 °C. For the hydrates of RE fluorides with decreasing RE radius, the RE content increases the sorption of water for TbF₃·0.5H₂O; DyF₃·0.5H₂O; YF₃·0.5H₂O; HoF₃·0.8H₂O; and ErF₃·0.9H₂O. The powders of REF₃·nH₂O consisted of micro- and nano-sized particles containing the amorphous phase. Water loss occurs in the 50–180 °C temperature range and is accompanied by a natural increase in enthalpy: from 23.6 J/g for TbF₃ · 0.5H₂O to 97.8 J/g for ErF₃·0.9H₂O and from 51.1 J/g for (H₃O)Tm₃F₁₀·1.7H₂O to 64.5 J/g for (H₃O)Lu₃F₁₀·0.9H₂O. Exothermic effects of formation of polycrystalline phase REF₃ were recorded in the 200–300 °C temperature range. The reaction of RE₂S₃ (Tm, Yb, Lu) powders with HF proceeds with the formation of the zeolite type compounds (H₃O)Tm₃F₁₀·1.7H₂O, (H₃O)Yb₃F₁₀·1.0H₂O and (H₃O)Lu₃F₁₀·0.9H₂O. Thermal dissociation occurs with gradual loss of water and HF to form RE fluorides with the β-YF₃ structure as described by

研究了钇亚组RE ₂ S ₃（Dy-Lu，Y）的稀土元素（RE）的硫化物与氢氟酸（浓度为49％）之间相互作用的性质。RE ₂ S ₃化合物的粉末是通过RE ₂ O ₃（Dy-Lu，Y）和Tb ₄ O ₇与H ₂ S和CS ₂的物流在1000-1050°C的温度下反应而获得的。RE ₂ S ₃和HF之间的反应是在玻璃碳坩埚中于21–25°C的温度范围内在溶液中进行的，沉淀物用H ₂洗涤O，并在90–100°C下干燥。对于RE半径减小的RE氟化物的水合物，RE含量增加了TbF ₃ · 0.5 H ₂ O的水吸附；反之，DyF ₃ · 0.5 H ₂ O；YF ₃ · 0.5 H ^ ₂ O; HoF ₃ · 0.8 H ₂ O；和ERF ₃ · 0.9 H ^ ₂ REF的O.粉末₃ · Ñ ħ ₂O由包含非晶相的微米和纳米尺寸的颗粒组成。发生在50-180℃的温度范围内的水损失并且伴随着在焓自然升高：从23.6焦耳/克为TbF系₃ · 0.5 H ^ ₂ O操作97.8焦耳/克为ERF ₃ · 0.9 H ^ ₂ O和从51.1焦耳/克为（H ₃ O）的Tm ₃ ˚F ₁₀ · 1.7 ħ ₂ O操作64.5焦耳/克为（H ₃ O）路₃ ˚F ₁₀ · 0.9 ħ ₂形成的多晶相REF的O.放热效果₃在200–300°C的温度范围内记录。RE ₂ S ₃（Tm，Yb，Lu）粉末与HF的反应进行，形成了沸石型化合物（H ₃ O）Tm ₃ F ₁₀ · 1.7 H ₂ O，（H ₃ O）Yb ₃ F ₁₀ · 1.0 ħ ₂ O和（H ₃ O）路₃ ˚F ₁₀ · 0.9 ħ ₂与水和HF逐渐损失到形式RE氟化物与β-YF发生O.热离解₃如由结构