The conductivity of non-crystalline fast ionic conductor for B_2O_3-Li_2O-LiCl-Al_2O_3 system is studiedin this paper. The glass structure of this system is discussed by means of infrared spectrum and X-ray fluorescen...The conductivity of non-crystalline fast ionic conductor for B_2O_3-Li_2O-LiCl-Al_2O_3 system is studiedin this paper. The glass structure of this system is discussed by means of infrared spectrum and X-ray fluorescence analysis, and the effects of LiCl and A1_2O_3 on the conductivity of Li^+ in the system are studied as well. Adding Li_2O to the system gives rise to transfer from [BO_3] triangular units to [BO_4] tetrahedral. When Li_2O content exceeds 30mol%, the main group of the glass is the diborate group with more [BO_4] tetrahedra. The adding of LiCl has no obvious influence on the glass structure, and LiCl is under a state dissociated by network, but with the increase of LiCl, the increase of conductivity is obvious. By adding A1_2O_3, the glass can be formed when the room-temperature is cooling down,the conductivity decreases while the conductive activatory energy increases for the glass. The experiment shows that conductivity in the room-temperature is σ= 6.2×10^(-6)Ω^(-1)cm^(-1), when at 300℃, the σ=6.8×10^(-3)Ω^(-1)cm^(-1). The conductive activatory energy computed is 0.6～1.0eV.展开更多
The AIN ceramics with Y2O3 is prepared by hot-pressing. The phase compositions and their distributions are determined by X-ray, SEM and EPA. Both the relation between bend strength and temperature and the relation bet...The AIN ceramics with Y2O3 is prepared by hot-pressing. The phase compositions and their distributions are determined by X-ray, SEM and EPA. Both the relation between bend strength and temperature and the relation between bend strength and oxidation time in 1300℃ air are investigated. It is found that the bend strength decreases slightly with the increasing of temperature below 1300℃ and decreases violently within 1300 ~ 1500℃ . The samples are oxidized in 1300℃ air and their strength decreases with the increasing of oxidation time. The fracture mechanisms of AIN ceramics with Y2O3 at different temperature and after being oxidized in 1300℃ air are discussed.展开更多
文摘The conductivity of non-crystalline fast ionic conductor for B_2O_3-Li_2O-LiCl-Al_2O_3 system is studiedin this paper. The glass structure of this system is discussed by means of infrared spectrum and X-ray fluorescence analysis, and the effects of LiCl and A1_2O_3 on the conductivity of Li^+ in the system are studied as well. Adding Li_2O to the system gives rise to transfer from [BO_3] triangular units to [BO_4] tetrahedral. When Li_2O content exceeds 30mol%, the main group of the glass is the diborate group with more [BO_4] tetrahedra. The adding of LiCl has no obvious influence on the glass structure, and LiCl is under a state dissociated by network, but with the increase of LiCl, the increase of conductivity is obvious. By adding A1_2O_3, the glass can be formed when the room-temperature is cooling down,the conductivity decreases while the conductive activatory energy increases for the glass. The experiment shows that conductivity in the room-temperature is σ= 6.2×10^(-6)Ω^(-1)cm^(-1), when at 300℃, the σ=6.8×10^(-3)Ω^(-1)cm^(-1). The conductive activatory energy computed is 0.6～1.0eV.
文摘The AIN ceramics with Y2O3 is prepared by hot-pressing. The phase compositions and their distributions are determined by X-ray, SEM and EPA. Both the relation between bend strength and temperature and the relation between bend strength and oxidation time in 1300℃ air are investigated. It is found that the bend strength decreases slightly with the increasing of temperature below 1300℃ and decreases violently within 1300 ~ 1500℃ . The samples are oxidized in 1300℃ air and their strength decreases with the increasing of oxidation time. The fracture mechanisms of AIN ceramics with Y2O3 at different temperature and after being oxidized in 1300℃ air are discussed.
