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首页> 外文期刊>Contributions to Mineralogy and Petrology >Solubility of niobium in the system CaCO3–Ca(OH)2–NaNbO3 at 0.1 GPa pressure
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Solubility of niobium in the system CaCO3–Ca(OH)2–NaNbO3 at 0.1 GPa pressure

机译:铌在0.1 GPa压力下在CaCO3 –Ca(OH)2 –NaNbO3 系统中的溶解度

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摘要

Experimental data are presented for the solubility of NaNbO3 in the ternary system CaCO3–Ca(OH)2–NaNbO3 (or calcite–portlandite–lueshite) over the temperature range 500–950 °C at 0.1 GPa pressure. Near-liquidus phase relationships are given for the pseudo-binary join ([CaCO3]45[Ca(OH)2]55)100– x –(NaNbO3) x ; (0 as a primary liquidus phase until the melts contain greater than 60 wt% NaNbO3. The primary crystallization fields of calcite and NaNbO3 are separated by a steep thermal valley located at about 55 wt% NaNbO3. Quenched liquids contain calcite, portlandite, sodium carbonates and perovskite-structured calcium niobates. The maximum solubility of Nb2O5 in this system is estimated to be on the order of 48 wt% at 650 °C at 0.1 GPa pressure. The experiments show that perovskite-structured compounds rather than pyrochlore crystallize from these fluorine-free, water-rich melts.
机译:给出了温度范围内NaNbO3 在三元体系CaCO3 –Ca(OH)2 –NaNbO3 (或方解石–钙锰矿–褐铁矿)中的溶解度的实验数据。在0.1 GPa压力下为500–950°C。准二元连接([CaCO3 ] 45 [Ca(OH)2 ] 55 )100 – x给出了接近液相线的关系 –(NaNbO3 )x ; (0 <x <70wt%)。这些数据表明,方解石加上液体存在着很大的区域,而直到熔体中NaNabO3的含量超过60%(重量)时,NaNbO3仍没有作为液相的主要相。方解石和NaNbO3 的初始结晶场被位于约55 wt%NaNbO3 处的陡峭的热谷隔开。淬火的液体包含方解石,硅酸盐,碳酸钠和钙钛矿结构的铌酸钙。 Nb2 O5 在该系统中的最大溶解度估计在650°C,0.1 GPa压力下约为48 wt%。实验表明,钙钛矿结构的化合物而不是烧绿石从这些无氟,富水的熔体中结晶出来。

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