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【期刊论文】A study on textured silver tapes used as substrates for YBCO high temperature superconductors
周美玲, Danmin Liu), Meiling Zhou, Yancao Hu, Tieyong Zuo
Physica C 333 (2000) 235-241,-0001,():
-1年11月30日
A single-component, 1104 211:, biaxially textured silver tape was obtained by cold-rolling and annealing. The cold-rolling textures and recrystallization textures of silver were studied systematically. It is shown that a sharp biaxial 1104 texture can be obtained by using higher total rolling reduction, lower reduction per pass and higher annealing temperature. In-plane aligned YBCO film was deposited directly by pulsed laserdeposition PLD. on a textured silver foil having 1104 211: orientation. The critical current density Jc value of 5=105 Arcm2 was obtained at 77 K, 0 T.
Silver, Biaxial 1104 texture, Deformation textures, Recrystallization textures, Coated conductors
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【期刊论文】A study of secondary electron emission properties of the molybdenum cathode doped with RE2O3
周美玲, Jinshu Wanga, *, Hongyi Lia, Juan Liua, Yiman Wanga, Meiling Zhoua, Yujuan Gaob, Siwu Taoa, Jiuxing Zhanga
Applied Surface Science 215(2003)273-279,-0001,():
-1年11月30日
The secondary electron emission properties of rare-earth-doped molybdenum emitter made by aqueous solution-solid doping method, its microstructure and surface behavior are discussed in this paper. The experimental results show that adding rare-earth oxides La2O3,Y2O3 and Gd2O3 into molybdenum raises the maximum secondary electron yield dm from 1.25 of clean Mo to 2.0-3.24 of doped molybdenum when heated to 1100-1600 8C in vacuum. With increasing percentage content of doped rare-earth oxide dm is enhanced in some extent. dm remains nearly constant during 1000h of test period when cathodes are operated at 1100 8C and under primary electron bombardment with bombarding energy of 1000 eVand bombarding power of 300W/cm2. This demonstrates such cathodes have good anti-bombing insensitivity. A work function of about 2.7-2.8 eV is obtained from Richardson lines. SEM observations and EDS analysis show that distribution of rare-earth oxides in the cathode body is inhomogeneous and tends to aggregate at molybdenum grain boundaries. By AES analysis it is found, that atomic concentrations of La and Yon the surface are about 2.5 times higher than in the bulk for a sintered body and further increase after activation.We believe the rare-earth atoms segregated at the grain boundaries diffuse along the grain boundary during the process of cathode activation. Therefore, the surface of the cathode is covered by a certain amount of rare-earth oxide. As a result, the secondary electron yield is improved.
Rare-earth oxides, Doped molybdenum, Secondary emission, Secondary electron yield
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【期刊论文】A study of diffusion behavior of elements lanthanum and oxygen in
周美玲, Mo–La O cathode Wang Jinshu*, Zhou Meiling, Nie Zuoren, Zhang Jiuxing, Zuo Tieyong, Wang Yiman
Journal of Alloys and Compounds 311(2000)82-85,-0001,():
-1年11月30日
The diffusion behavior of elements lanthanum and oxygen in Mo–La O cathode has been carried out by using Auger Electron 2 3 31 21 Spectroscopy. Lanthanum and oxygen ions (La and O) diffuse from the grain boundaries to the surface. The experimental results 31 were analyzed by kinetics of grain boundary diffusion. In the temperature range 1123 K-1423 K, the diffusion coefficients of La and21 O ions were found to fit with the following expression: 216 5 2 21 D 53.6703310 exp(21.01639310 /RT) m s La 216 4 2 21 D 51.5122310 exp(28.13066310 /RT) m s O
Diffusion, Lanthanum, Oxygen, Cathode, Kinetics, Mo–La O 2 3
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周美玲, Hong-Li Suo, Mei-Ling Zhou, Le-Heng Zhai, Zhuo Sun, Xin-Fu Xu, Wei Han, Tie-Yong Zuo
Physica C 282-287(1997)567-568,-0001,():
-1年11月30日
By selecting polycrystalline Ag as the substrates, highly c-axis(O01) textured YBCO films have been fabricated by using a modified magnetron sputtering equipment. Research on the textures of cold rolling Ag at different deformation degree and recrystallization textures of cold-rolling Ag at different temperature shows that in-plane alignment of YBCO film is difficult to obtain directly on cold rolling Ag substrates because of a series of change of textures in Ag during heating. The sharp recrystallization textures with cube (001)[010] and rotated cube(001)[012] in Ag have been developed. Experiments offer a possible prospect for the further study of fabricating sharp biaxially texture in Ag and the following deposition of high J YBCO films directly on it.
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周美玲, 王金淑, 左铁镛, 聂祚仁, 张久兴, 张国珍
金属学报,2001,37(6):668~672,-0001,():
-1年11月30日
采用热分析,原位XPS等方法对Mo-La203阴极中La的价态进行了研究,探讨了陔阴极的发射机理实验结果表明,在高温下La203可以被M02C还原成单质La。La2O3-Mo阴极的发射可用原子膜机理解释:住阴极工作过程中,还原得到的La覆盖在Mo基体表面,降低了基体Mo的逸出功,促进了阴极的发射。根据此机理提出r La203-Mo电于管制备和运行工艺,使电子管的工作寿命提高到了满足实际应用要求的水平。
La203-Mo,, 热阴极,, 发射机理,, 价态
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