A calorimetric investigation of the thermodynamic properties of cesium uranyl molybdate, ${\mathrm{C}\mathrm{s}}_6[({\left(\mathrm{U}{\mathrm{O}}_2\right)}_2{\left(\mathrm{M}\mathrm{o}{\mathrm{O}}_4\right)}_3\left(\mathrm{M}\mathrm{o}{\mathrm{O}}_5)\right]$, was undertaken. The investigated phase was synthesized by high-temperature solid-state reaction from a mixture of cesium nitrate, molybdenum (VI) oxide and gamma uranium (VI) oxide. The synthetic product was characterized by X-ray powder diffraction and X-ray fluorescence and they show a successful synthesis giving better than 98% of the intended phase. Low-temperature molar heat capacity, $C_{p,\mathrm{m}}^{\mathrm{o}}$, was measured using adiabatic calorimetry between T = 12.3 and 324.3 K. The data were well behaved and do not show any indication of a phase transition or a $C_{p,\mathrm{m}}^{\mathrm{o}}$ anomaly. Using the $C_{p,\mathrm{m}}^{\mathrm{o}}(T)$ data, the standard molar third-law entropy at T = 298.15 K, $S_{\mathrm{m}}^{\mathrm{o}}$, is calculated as 987 ± 4 J∙K⁻¹∙mol⁻¹. The molar enthalpy of formation of ${\mathrm{C}\mathrm{s}}_6[{\left(\mathrm{U}{\mathrm{O}}_2\right)}_2{\left(\mathrm{M}\mathrm{o}{\mathrm{O}}_4\right)}_3\left(\mathrm{M}\mathrm{o}{\mathrm{O}}_5)\right]$ was determined using HF-acid solution calorimetry giving: ${{\mathrm{\Delta }}_{\mathrm{f}}H}_{\mathrm{m}}^{\mathrm{o}}(T=298.15\mathrm{K},{\mathrm{C}\mathrm{s}}_6[{\left(\mathrm{U}{\mathrm{O}}_2\right)}_2{\left(\mathrm{M}\mathrm{o}{\mathrm{O}}_4\right)}_3\left(\mathrm{M}\mathrm{o}{\mathrm{O}}_5)\right],\mathrm{c}\mathrm{r})=-7873\pm 12\mathrm{k}\mathrm{J}\bullet {\mathrm{m}\mathrm{o}\mathrm{l}}^{-1}.$ These new calorimetric results, together with thermodynamic data from the literature, are used to calculate the molar Gibbs free energy of formation, ${{\mathrm{\Delta }}_{\mathrm{f}}G}_{\mathrm{m}}^{\mathrm{o}}$, giving: ${\mathrm{\Delta }}_{\mathrm{f}}{G}_{\mathrm{m}}^{\mathrm{o}}(T=298.15\mathrm{K},{\mathrm{C}\mathrm{s}}_6[{\left(\mathrm{U}{\mathrm{O}}_2\right)}_2{\left(\mathrm{M}\mathrm{o}{\mathrm{O}}_4\right)}_3\left(\mathrm{M}\mathrm{o}{\mathrm{O}}_5)\right],\mathrm{c}\mathrm{r})=-7309\pm 13\mathrm{k}\mathrm{J}\bullet {\mathrm{m}\mathrm{o}\mathrm{l}}^{-1}$. Best-fit and smoothed $C_{p,\mathrm{m}}^{\mathrm{o}}\left(T\right)$ values for ${\mathrm{C}\mathrm{s}}_6[{\left(\mathrm{U}{\mathrm{O}}_2\right)}_2{\left(\mathrm{M}\mathrm{o}{\mathrm{O}}_4\right)}_3\left(\mathrm{M}\mathrm{o}{\mathrm{O}}_5)\right]$ between 0 K and T = 324 K are presented in table form, along with values for $S_{\mathrm{m}}^{\mathrm{o}}$ and the functions ${[H}_{\mathrm{m}}^{\mathrm{o}}\left(T\right)-H_{\mathrm{m}}^{\mathrm{o}}\left(0\right)]$ and ${[\mathrm{\Phi }}_{\mathrm{m}}^{\mathrm{o}}\left(T\right)-{\mathrm{\Phi }}_{\mathrm{m}}^{\mathrm{o}}\left(0\right)]$. The amounts and behaviour of a number of different crystalline phases in the system “${\mathrm{C}\mathrm{s}}_6[{\left(\mathrm{U}{\mathrm{O}}_2\right)}_2{\left(\mathrm{M}\mathrm{o}{\mathrm{O}}_4\right)}_3\left(\mathrm{M}\mathrm{o}{\mathrm{O}}_5)\right]"$ in aqueous solution as a function of pH are calculated using a Gibbs-free-energy-minimization approach. The pH-crystalline phase stability fields in the ${\mathrm{C}\mathrm{s}}_2\mathrm{M}\mathrm{o}{\mathrm{O}}_4+\mathrm{U}{\mathrm{O}}_3+{\mathrm{H}}_2\mathrm{O}$ system, with and without $\mathrm{C}{\mathrm{O}}_2$, are also calculated.

量热法研究钼酸铀酰铯的热力学性质， ${\mathrm{C}\mathrm{s}}_6[（{\left(\mathrm{ü}{\mathrm{Ø}}_2\right)}_2{\left(\mathrm{中号}\mathrm{Ø}{\mathrm{Ø}}_4\right)}_3\left(\mathrm{中号}\mathrm{Ø}{\mathrm{Ø}}_5）\right]$进行。通过高温固态反应，由硝酸铯，氧化钼（VI）和氧化γ铀（VI）的混合物合成了所研究的相。合成产物的特征在于X射线粉末衍射和X射线荧光，它们显示出成功的合成，给出了超过98％的预期相。低温摩尔热容，$C_{p，\mathrm{米}}^{\mathrm{Ø}}$使用绝热量热法在T =  12.3和324.3 K之间进行测量。数据表现良好，没有显示任何相变或相变迹象。$C_{p，\mathrm{米}}^{\mathrm{Ø}}$异常。使用$C_{p，\mathrm{米}}^{\mathrm{Ø}}（Ť）$数据，标准摩尔摩尔定律第三熵在T =  298.15 K，${\mathrm{小号}}_{\mathrm{米}}^{\mathrm{Ø}}$，计算为987±4 J∙K ^-1 ∙mol ^-1。生成的摩尔焓${\mathrm{C}\mathrm{s}}_6[{\left(\mathrm{ü}{\mathrm{Ø}}_2\right)}_2{\left(\mathrm{中号}\mathrm{Ø}{\mathrm{Ø}}_4\right)}_3\left(\mathrm{中号}\mathrm{Ø}{\mathrm{Ø}}_5）\right]$ 用HF-酸溶液量热法测定，得到： ${{\mathrm{\Delta }}_{\mathrm{F}}H}_{\mathrm{米}}^{\mathrm{Ø}}（Ť=298.15\mathrm{ķ}，{\mathrm{C}\mathrm{s}}_6[{\left(\mathrm{ü}{\mathrm{Ø}}_2\right)}_2{\left(\mathrm{中号}\mathrm{Ø}{\mathrm{Ø}}_4\right)}_3\left(\mathrm{中号}\mathrm{Ø}{\mathrm{Ø}}_5）\right]，\mathrm{C}\mathrm{[R}）=--7873\pm 12\mathrm{ķ}\mathrm{Ĵ}\bullet {\mathrm{米}\mathrm{Ø}\mathrm{升}}^{--\mathrm{1个}}。$ 这些新的量热结果与文献中的热力学数据一起用于计算摩尔吉布斯自由形成能， ${{\mathrm{\Delta }}_{\mathrm{F}}G}_{\mathrm{米}}^{\mathrm{Ø}}$，给出： ${\mathrm{\Delta }}_{\mathrm{F}}{G}_{\mathrm{米}}^{\mathrm{Ø}}（Ť=298.15\mathrm{ķ}，{\mathrm{C}\mathrm{s}}_6[{\left(\mathrm{ü}{\mathrm{Ø}}_2\right)}_2{\left(\mathrm{中号}\mathrm{Ø}{\mathrm{Ø}}_4\right)}_3\left(\mathrm{中号}\mathrm{Ø}{\mathrm{Ø}}_5）\right]，\mathrm{C}\mathrm{[R}）=--7309\pm 13\mathrm{ķ}\mathrm{Ĵ}\bullet {\mathrm{米}\mathrm{Ø}\mathrm{升}}^{--\mathrm{1个}}$。最佳配合和平滑$C_{p，\mathrm{米}}^{\mathrm{Ø}}\left(Ť\right)$ 的值 ${\mathrm{C}\mathrm{s}}_6[{\left(\mathrm{ü}{\mathrm{Ø}}_2\right)}_2{\left(\mathrm{中号}\mathrm{Ø}{\mathrm{Ø}}_4\right)}_3\left(\mathrm{中号}\mathrm{Ø}{\mathrm{Ø}}_5）\right]$ 以表格形式显示0 K和T = 324 K之间的值，以及${\mathrm{小号}}_{\mathrm{米}}^{\mathrm{Ø}}$ 和功能 ${[H}_{\mathrm{米}}^{\mathrm{Ø}}\left(Ť\right)--H_{\mathrm{米}}^{\mathrm{Ø}}\left(0\right)]$ 和 ${[\mathrm{\Phi }}_{\mathrm{米}}^{\mathrm{Ø}}\left(Ť\right)--{\mathrm{\Phi }}_{\mathrm{米}}^{\mathrm{Ø}}\left(0\right)]$。系统中许多不同晶相的数量和行为“${\mathrm{C}\mathrm{s}}_6[{\left(\mathrm{ü}{\mathrm{Ø}}_2\right)}_2{\left(\mathrm{中号}\mathrm{Ø}{\mathrm{Ø}}_4\right)}_3\left(\mathrm{中号}\mathrm{Ø}{\mathrm{Ø}}_5）\right]”$使用吉布斯自由能最小化方法计算水溶液中的pH随pH的变化。在pH值结晶相稳定领域${\mathrm{C}\mathrm{s}}_2\mathrm{中号}\mathrm{Ø}{\mathrm{Ø}}_4+\mathrm{ü}{\mathrm{Ø}}_3+{\mathrm{H}}_2\mathrm{Ø}$ 系统，有无 $\mathrm{C}{\mathrm{Ø}}_2$，也要计算。