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首页> 外文期刊>American Journal of Science >GIBBS ENERGIES OF FORMATION OF METAL-CARBONATE SOLID SOLUTIONS 2: THE CA_XSR_(1-Z)CO_3(S) SYSTEM AT 298 K AND 1 BAR
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GIBBS ENERGIES OF FORMATION OF METAL-CARBONATE SOLID SOLUTIONS 2: THE CA_XSR_(1-Z)CO_3(S) SYSTEM AT 298 K AND 1 BAR

机译：碳-碳酸盐固溶体形成的吉布斯能量2：CA_XSR_（1-Z）CO_3（S）系统在298 K和1 bar下

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摘要

New thermodynamic data are presented for the Gibbs energies of formation (ΔG_f~o[Ca_xSr_(1-x)CO_3(s)]) and the excess Gibbs energies of formation (G~E) for Ca_xSr_(1-x)CO_3(s) solutions. Reversible equilibria were achieved between CaCl_2(aq) + SrCl_2(aq) solutions and carbonate electrodes of the third kind in electrochemical cells of the type: Pb(Hg, 2 - phase) | PbCO_3(s), Ca_xSr_(1-x)CO_3(s)|SrCl_2(m_1), CaCl_2(m_2), |Hg_2Cl_2(s)|Hg(l) In most cases, we found no evidence in X-ray diffractograms for incongruent dissolution of the solids to yield strontian aragonites or calcite over the period of the cell measurements. Although secondary calcite forms in some experiments, the unmixing is sufficiently slow (weeks of reaction) that meaningful ΔG_f~o[Ca_xSr_(1-x)CO_3(s)] values can be determined. We observe positive G~E values over the range 0 < x < 0.9 such that intermediate compositions in the SrCO_3-CaCO_3 binary are unstable relative to a mechanical mixture consistent with the compositions of natural minerals. The G~E values determined in this study agree with those determined by Plummer and Busenberg (1987) to within the respective experimental uncertainties. The G~E values that we report remain unchanged, if the values of ΔG_f~o[SrCO_3(s)] and ΔG_f~o[Sr~(2+)(aq)] are revised in a compensating manner in a later study.
机译：给出了新的热力学数据，用于形成的吉布斯能（ΔG_f〜o [Ca_xSr_（1-x）CO_3（s）]）和对于Ca_xSr_（1-x）CO_3（s）的过量吉布斯能（G〜E） ）解决方案。在以下类型的电化学电池中，CaCl_2（aq）+ SrCl_2（aq）溶液与第三种碳酸盐电极之间可逆平衡： PbCO_3（s），Ca_xSr_（1-x）CO_3（s）| SrCl_2（m_1），CaCl_2（m_2），| Hg_2Cl_2（s）| Hg（l）在大多数情况下，我们在X射线衍射图中没有发现任何证据在细胞测量期间，固体的不均匀溶解产生锶锶文石或方解石。尽管在某些实验中形成了二次方解石，但解混足够缓慢（反应数周），因此可以确定有意义的ΔG_f〜o [Ca_xSr_（1-x）CO_3（s）]值。我们观察到在0

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