In this work, we investigated the thermodynamic properties of synthetic schafarzikite (FeSb₂O\(_4\)) and tripuhyite (FeSbO\(_4\)). Low-temperature heat capacity (\(C_p\)) was determined by relaxation calorimetry. From these data, third-law entropy was calculated as \(110.7\pm 1.3\) J mol\(^{-1}\)K\(^{-1}\) for tripuhyite and \(187.1\pm 2.2\) J mol\(^{-1}\) K\(^{-1}\) for schafarzikite. Using previously published \(\Delta _fG^o\) values for both phases, we calculated their \(\Delta _fH^o\) as \(-947.8\pm 2.2\) for tripuhyite and \(-1061.2\pm 4.4\) for schafarzikite. The accuracy of the data sets was tested by entropy estimates and calculation of \(\Delta _fH^o\) from estimated lattice energies (via Kapustinskii equation). Measurements of \(C_p\) above \(T = 300\) K were augmented by extrapolation to \(T = 700\) K with the frequencies of acoustic and optic modes, using the Kieffer \(C_p\) model. A set of equilibrium constants (\(\log K\)) for tripuhyite, schafarzikite, and several related phases was calculated and presented in a format that can be employed in commonly used geochemical codes. Calculations suggest that tripuhyite has a stability field that extends over a wide range of pH-p\(\epsilon\) conditions at \(T = 298.15\) K. Schafarzikite and hydrothermal oxides of antimony (valentinite, kermesite, and senarmontite) can form by oxidative dissolution and remobilization of pre-existing stibnite ores.

_{在这项工作中，我们研究了合成的铁锌矿 (FeSb 2} O \(_4\) ) 和三水铁矿 (FeSbO \(_4\) )的热力学性质。低温热容（\(C_p\)）通过弛豫量热法测定。根据这些数据，三水石的第三定律熵计算为\(110.7\pm 1.3\) J mol \(^{-1}\) K \(^{-1}\)和\(187.1\pm 2.2\) ) J mol \(^{-1}\) K \(^{-1}\)对于白铁矿。使用先前发布的两个相位的\(\Delta _fG^o\)值，我们将其\(\Delta _fH^o\)计算为\(-947.8\pm 2.2\)对于三铁矿和\(-1061.2\pm 4.4\)对于白铁矿。数据集的准确性通过熵估计和估计晶格能量（通过 Kapustinskii 方程）计算\(\Delta _fH^o\)来测试。使用 Kieffer \(C_p\)模型，通过声学和光学模式的频率外推至 \ (T = 700\) K 来增强高于\(T = 300 \) K 的\(C_p\)测量值。一组平衡常数 ( \(\log K\)）对三水铁矿、磷铁矿和几个相关相进行了计算，并以可在常用地球化学代码中采用的格式呈现。计算表明，三水铝矿具有在\(T = 298.15\) K下在广泛的 pH-p \(\epsilon\)条件下延伸的稳定性场。磷钾矿和锑的热液氧化物（锑矿、钙镁矿和钠锰矿）可以通过氧化溶解和重新活化预先存在的辉锑矿矿石而形成。