Abstract: RD496-2000 micro calorimeter was used to obtain thermodynamics and kinetics information of micro/nano BaMoO4 crystal in-situ growth and to explain thermodynamics and kinetics mechanism of preparation reaction about micro/nano BaMoO4. Apparent process of preparation reaction is exothermic, endexothermic and exothermic, respectively, the variational tendency of apparent rate constant k and apparent order of reaction n kept the same; however, both numerical value and velocity of variation were different. The results of calorimetry in microemulsion system and water system existed a gap, because there were collision, transfe-rence, fusion, separation and reconstitution of reverse micelle in micro emulsion, which could be analyzed by comparison.

Key words: Reverse micro emulsion, Barium molybdate, in-situ growth, Caloric curve, Formation mechanism