A series of (Ag0.9Li0.1)(Nb1-yTay)O3 ceramic powders were prepared by an aque-chemical method. The optimized calcination temperature, time and crystal lattice were studied by TG-DTA, IR, XRD and TEM. The results show ...A series of (Ag0.9Li0.1)(Nb1-yTay)O3 ceramic powders were prepared by an aque-chemical method. The optimized calcination temperature, time and crystal lattice were studied by TG-DTA, IR, XRD and TEM. The results show that the optimized conditions were calcination of the precursor at 800 ℃ for 2 h. The ceramic powder thus prepared was rhombohedral with the average grain size of 48 nm.展开更多
Geoelectrical investigations in Tibetan Plateau show that there are two high conductivity layers (HCLs) in the crust of southern Tibetan Plateau. The first HCL is at a depth of 15～20km, and the second at 45～60km. In...Geoelectrical investigations in Tibetan Plateau show that there are two high conductivity layers (HCLs) in the crust of southern Tibetan Plateau. The first HCL is at a depth of 15～20km, and the second at 45～60km. In the central region of the Plateau, such as north Qiangtang and Bayan Har, there is only one HCL in crust at the depth about 15～20km.The origin of HCL in upper crust of southern Tibet is mainly caused by free saline aqueous fluids. The seismic investigation by project INDEPTH in southern Tibet demonstrates that the bright spot reflection at about 15km depth is caused by 10% volume of free aqueous fluids (Makovsky and Klemperer, 1999). Seismic and heat flow research indicates the temperature in 15km depth of Tibet is from 400℃ to 650℃. The high concentration of Cl - in water of geothermal spring in southern Tibet means that the aqueous fluid in crust is saline water. The experiment on conductivity of NaCl solution shows that the conductivity is more than 4.5 S·m -1 under 400MPa and 300～650℃ condition (Quist and Marshall, 1968). This p\|T condition corresponds to the pressure and temperature range at 15～20km depth of Tibet.展开更多
文摘A series of (Ag0.9Li0.1)(Nb1-yTay)O3 ceramic powders were prepared by an aque-chemical method. The optimized calcination temperature, time and crystal lattice were studied by TG-DTA, IR, XRD and TEM. The results show that the optimized conditions were calcination of the precursor at 800 ℃ for 2 h. The ceramic powder thus prepared was rhombohedral with the average grain size of 48 nm.
文摘Geoelectrical investigations in Tibetan Plateau show that there are two high conductivity layers (HCLs) in the crust of southern Tibetan Plateau. The first HCL is at a depth of 15～20km, and the second at 45～60km. In the central region of the Plateau, such as north Qiangtang and Bayan Har, there is only one HCL in crust at the depth about 15～20km.The origin of HCL in upper crust of southern Tibet is mainly caused by free saline aqueous fluids. The seismic investigation by project INDEPTH in southern Tibet demonstrates that the bright spot reflection at about 15km depth is caused by 10% volume of free aqueous fluids (Makovsky and Klemperer, 1999). Seismic and heat flow research indicates the temperature in 15km depth of Tibet is from 400℃ to 650℃. The high concentration of Cl - in water of geothermal spring in southern Tibet means that the aqueous fluid in crust is saline water. The experiment on conductivity of NaCl solution shows that the conductivity is more than 4.5 S·m -1 under 400MPa and 300～650℃ condition (Quist and Marshall, 1968). This p\|T condition corresponds to the pressure and temperature range at 15～20km depth of Tibet.
