Study on structure-inheriting solid-state dehydration reactions under hydrothermal conditions

The conversion mechanism of comoo_4 / 4h_2 O into hp- comoo_4 under hydrothermal conditions wasrevealed. The crystal structure of nimoo_4 nh_2o was first determined，and was revealed to be isostructural with comoo_4.3 / 4h_2o . The structural changes of isostructuralnimoo_4 / nh_2o and non-isostructural mmoo_4 / h_2o (M=Mg，Mn) during the hydrothermal treatments were also investigated were discussed comparing withthose of comoo_4 /4 h_2 O. In the course of the study，new hydrates como_4o_ <13>、2h_2o和imo_4o_ <13>、2h_2o were also found，and their （interesting pillared layer）结构确定。

The conversion mechanism of CoMoO_4・3/4H_2O into hp-CoMoO_4 under hydrothermal conditions was revealed. The crystal structure of NiMoO_4・nH_2O was first determined, and was revealed to be isostructural with CoMoO_4・3/4H_2O. The structural changes of isostructural NiMoO_4・nH_2O and non-isostructural MMoO_4・H_2O (M=Mg, Mn) during the hydrothermal treatments were also investigated and were discussed comparing with those of CoMoO_4・3/4H_2O. In the course of the study, new hydrates CoMo_4O_<13>・2H_2O and NiMo_4O_<13>・2H_2O were also found, and their (interesting pillared layer) structures were determined.