Calcium intercalates of MoS₂ with nominal composition Ca_xMoS₂ (0 ≤ x ≤ 0.50) were prepared in liquid ammonia. Ammonia molecules were also intercalated into MoS₂ along with Ca as revealed by thermogravimetric and gravimetric analysis. The intercalated products have a composition of Ca_x(NH₃)_yMoS₂ (0 ≤ y ≤ 0.40). The crystal structure of Ca_0.50(NH₃)_0.40MoS₂ was solved and refined from powder X-ray diffraction data. It exhibits a hexagonal symmetry (space group P-3m1) with a = 3.198(4) Å, c = 18.543(9) Å. The crystal structure of Ca_0.50(NH₃)_0.40MoS₂ was also investigated by Raman spectroscopy and transmission electron microscopy. Superstructure in the ab-plane and phase transition from 2H to 1T were not observed. Only samples with x in the range from 0.10 to 0.35 show superconducting properties and the T_c - x phase diagram of the Ca_x(NH₃)_yMoS₂ system exhibits a dome-like behavior. The maximum T_c of 8.6 K was observed in Ca_0.20(NH₃)_0.17MoS₂, which is higher than the T_c reported before in chemically doped transition metal dichalcogenides. The Ca_0.20(NH₃)_0.17MoS₂ is a type-II superconductor with H_c2 (0) around 0.098 T and ξ (0) about 58.0 nm.

的MoS的钙插层₂与标称组成的Ca _X的MoS ₂（0≤ X ≤0.50）在液氨中制备。如通过热重分析和重量分析所揭示的，氨分子也与Ca一起插入MoS _2中。插层产品具有钙的组合物_X（NH ₃）_ÿ的MoS ₂（0≤ Ý ≤0.40）。从粉末X射线衍射数据解析并细化了Ca _0.50（NH ₃）_0.40 MoS ₂的晶体结构。它表现出六边形对称性（空间群P-3 m 1），其中a = 3.198（4） Å，c = 18.543（9） Å。还通过拉曼光谱和透射电子显微镜研究了Ca _0.50（NH ₃）_0.40 MoS ₂的晶体结构。没有观察到ab平面的上层结构和从2H到1T的相变。只有x的范围从0.10到0.35的样品才显示出超导特性，Ca _x（NH ₃）_y MoS ₂系统的T _c - x相图表现出圆顶状的行为。最大值在Ca _0.20（NH ₃）_0.17 MoS ₂中观察到8.6 K的T _c，这比以前在化学掺杂的过渡金属二卤化金属中报道的T _c高。Ca _0.20（NH ₃）_0.17 MoS ₂是II型超导体，H _c2（0）约为0.098 T，而ξ（0）约为58.0 nm。