Ce Zr O solid solution was prepared by four different methods, i.e., decomposition of nitrate, coprecipiation, hydroxysuainic acid sol gel as well as citrate sol gel, and characterized by using X ray powder diffr...Ce Zr O solid solution was prepared by four different methods, i.e., decomposition of nitrate, coprecipiation, hydroxysuainic acid sol gel as well as citrate sol gel, and characterized by using X ray powder diffraction, Raman and temperature programmed reduction. The phase composition and the reduction properties of Ce Zr O depend on the preparation method. A cubic Ce 0.5 Zr 0.5 O 2 solid solution can be obtained by using the sol gel method. The Ce Zr O solid solution prepared by using decomposition or coprecipiation was composed of cubic Ce 0.8 Zr 0.2 O 2 and tetragonal Ce 0.2 Zr 0.8 O 2 solid solution. The Ce Zr O solid solution prepared with different methods shows the different reduction properties owing to different phase composition. Results of differential thermal analysis and XRD show that Ce 0.5 Zr 0.5 O 2 solid solution is formed during the decomposition or combustion of the gel.展开更多
The 500℃ isothermal section of the phase diagram of the Cu Be Ag (Cu≥50 at%) ternary system was investigated by X ray powder diffraction. The isothermal section consists of two single phase regions (namely α C...The 500℃ isothermal section of the phase diagram of the Cu Be Ag (Cu≥50 at%) ternary system was investigated by X ray powder diffraction. The isothermal section consists of two single phase regions (namely α Cu and CuBe), two two phase regions (namely α Cu+Ag and CuBe+α Cu) and one three phase region (namely α Cu+Ag+CuBe). The maximum solubility of Be in α Cu and Ag in α Cu are about 6.6 at% and 0.8 at% respectively.展开更多
文摘Ce Zr O solid solution was prepared by four different methods, i.e., decomposition of nitrate, coprecipiation, hydroxysuainic acid sol gel as well as citrate sol gel, and characterized by using X ray powder diffraction, Raman and temperature programmed reduction. The phase composition and the reduction properties of Ce Zr O depend on the preparation method. A cubic Ce 0.5 Zr 0.5 O 2 solid solution can be obtained by using the sol gel method. The Ce Zr O solid solution prepared by using decomposition or coprecipiation was composed of cubic Ce 0.8 Zr 0.2 O 2 and tetragonal Ce 0.2 Zr 0.8 O 2 solid solution. The Ce Zr O solid solution prepared with different methods shows the different reduction properties owing to different phase composition. Results of differential thermal analysis and XRD show that Ce 0.5 Zr 0.5 O 2 solid solution is formed during the decomposition or combustion of the gel.
文摘The 500℃ isothermal section of the phase diagram of the Cu Be Ag (Cu≥50 at%) ternary system was investigated by X ray powder diffraction. The isothermal section consists of two single phase regions (namely α Cu and CuBe), two two phase regions (namely α Cu+Ag and CuBe+α Cu) and one three phase region (namely α Cu+Ag+CuBe). The maximum solubility of Be in α Cu and Ag in α Cu are about 6.6 at% and 0.8 at% respectively.
