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研究者们利用微量热计确定了在1290°K下,α-氧化铝溶解于纯冰晶石中的克分子热焓。在无限烯释的情况下,α-氧化铝溶解部分的热焓为+257千焦耳克分子~(-1)。热焓值随氧化铝含量增加快速下降。当氧化铝的浓度保持5～12％(重量)时,热焓值恒定(即h溶解Al_2O_3=+146千焦耳克分子~(-1))。研究了氟化物添加剂的影响。提出了在冰晶石-氧化铝混合物中存在AlOF_3~(2-)与AlOF_5~(4-)离子的假说。
The researchers used microcalorimetry to determine the molar enthalpy of α-alumina dissolved in pure cryolite at 1290 ° K. In the case of infinite ethylene release, the enthalpy of the α-alumina dissolution is +257 kJ mol⁻¹. The enthalpy decreases rapidly with the increase of alumina content. When the concentration of alumina remains 5-12% by weight, the enthalpy value is constant (that is, h dissolves Al 2 O 3 = +146 kJ mol -1). The effect of fluoride additives was studied. The hypothesis of AlOF_3 ~ (2-) and AlOF_5 ~ (4-) ions in the cryolite-alumina mixture was proposed.