Anomalous Heat Capacities and Structure Changes in Phase Transition of Silicate Minerals

采用绝热水化量热法和x射线粉末衍射对不同阳离子交换的合成a型沸石和部分天然沸石的水化机理进行了研究。研究了几种适合作为沸石-水对热泵系统换热吸附剂的沸石。(2)利用本项目引进的差动差DSC （TA-Instrument Model 2910）对硅酸盐和部分硫化物矿物的热容异常进行了研究。例如，阿克尔曼石的热容异常是围绕着不相称的正态相变进行澄清的。(3)合成了Cu3BiS3和AgBi3S5等离子导体，并测量了离子传导转变温度附近的热容，以解释转变机制。为制备精确的x射线结构分析，还合成了单晶。(4)合成了光致发光材料Zn2SiO4的单晶，并对其晶体结构进行了分析，得到了Zn和Si原子的部分无序性。采用干法合成了一种新型发光材料Ba2 (TiO) [Si2O7]。

Variously cation-exchanged synthetic A-type zeolites and some natural zeolites have been investigated in hydration mechanisms by using the adiabatic hydration calorimeter method and X-ray powder diffraction. Some zeolite species investigated were found suitable for heat exchange absorbent for a heat pump system of the zeolitewater pair. (2) Precession DSC (TA-Instrument Model 2910) introduced in the present project were used for investigating heat capacity anomalies in silicate and some sulfide minerals. Akermanite heat capacity anomalies were clarified around the incommensurate-norml phase transition, for example. (3) Ionic conductors such as Cu3BiS3 and AgBi3S5 were synthesized, and measured in heat capacities around ionic conduction-transition temperatures to explain transition mechanisms. Single crystals were also synthesized for preparation of precise X-ray structure analysis. (4) Single crystals of a photo-luminescent material, Zn2SiO4, was synthesized and analyzed in the crystal structure to give partial disordering of Zn and Si atoms. A new luminescent material, Ba2 (TiO) [Si2O7], was found and synthesized in dry method.