1文献来源
Dunne C, Burke JP, Morrow M, et al. Effect of margin status on local recurrence after breast conservation and radiation therapy for ductal carcinoma in situ [J]. J Clin Oncol, 2009,28(10):1615-1620.
Perovskite type lithium fast ion conductors of Li 3 x La 0.67- x Y y Ti 1-2 y Nb y O 3 system were prepared by solid state reaction. X Ray powder diffraction shows that a single phase ...Perovskite type lithium fast ion conductors of Li 3 x La 0.67- x Y y Ti 1-2 y Nb y O 3 system were prepared by solid state reaction. X Ray powder diffraction shows that a single phase perovskite solid solution with orthorhombic structure forms in the ranges of x =0.10, y <0.075. Over this composition range the another phase, Y 2O 3 hexagonal phase is found. AC impedance measurements indicate that the bulk conductivities and the total conductivities are of the order of 10 -4 S·cm -1 and 10 -5 S·cm -1 at 25 ℃ respectively. The compositions have low bulk activation energies of about 20 kJ·mol -1 and total activation energies of about 40 kJ·mol -1 in the temperature range of 298~523 K, respectively.展开更多
文摘1文献来源
Dunne C, Burke JP, Morrow M, et al. Effect of margin status on local recurrence after breast conservation and radiation therapy for ductal carcinoma in situ [J]. J Clin Oncol, 2009,28(10):1615-1620.
文摘Perovskite type lithium fast ion conductors of Li 3 x La 0.67- x Y y Ti 1-2 y Nb y O 3 system were prepared by solid state reaction. X Ray powder diffraction shows that a single phase perovskite solid solution with orthorhombic structure forms in the ranges of x =0.10, y <0.075. Over this composition range the another phase, Y 2O 3 hexagonal phase is found. AC impedance measurements indicate that the bulk conductivities and the total conductivities are of the order of 10 -4 S·cm -1 and 10 -5 S·cm -1 at 25 ℃ respectively. The compositions have low bulk activation energies of about 20 kJ·mol -1 and total activation energies of about 40 kJ·mol -1 in the temperature range of 298~523 K, respectively.