A novel nanocomposite Mo–4%La2O3 cathode |
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| Affiliation: | 1. School of Materials Science and Engineering, Xi''an Jiaotong University, Xi''an 710049, China;2. School of Science , Xi''an Jiaotong University, Xi''an 710049, China;1. Department of Physics, M.L. Sukhadia University, Udaipur 313001, Rajasthan, India;2. Department of Pure & Applied Physics, University of Kota, Kota 324007, Rajasthan, India;1. National & Local Joint Engineering Laboratory for New Petro-chemical Materials and Fine Utilization of Resources, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, PR China;2. Key Laboratory of Catalysis and Material Sciences of the State Ethnic Affairs Commission & Ministry of Education, College of Chemistry and Material Sciences, South-Central University for Nationalities, Wuhan 430074, PR China;3. Chenzhou Gao Xin Material Co., Ltd., Chenzhou 423000, Hunan, PR China;1. University of Rome “Tor Vergata”, Department of Electronic Engineering, Via del Politecnico 1, Roma, 00133, Italy;2. Istituto Nazionale di Fisica Nucleare – Laboratori Nazionali di Frascati, Via E. Fermi 40, Frascati Roma, 00044, Italy;3. Ariel University, Department of Electrical and Electronic Engineering, Kiriyat Ha-Mada, 40700, Ariel, Israel;1. Department of Mechanical Engineering, Syed Ammal Engineering College, Tamilnadu, India;2. Department of ECE, Syed Ammal Engineering College, Tamilnadu, India;3. Guest faculty, Department of Physics, Sethupathy Govt Arts College, Tamilnadu, India;1. Department of Physics, Opole University of Technology, ul. Prószkowska 76, 45-758 Opole, Poland;2. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, ul. Okólna 2, 50-395 Wrocław, Poland |
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| Abstract: | A novel nanocomposite Mo–4%La2O3 cathode has been prepared by sol–gel method and hydrogen reduction process and then hot-pressing sintering technique. The lanthana particles in the nanocomposite cathode were less than 100 nm, and they were about 300–400 nm in the coarse-grained cathode. The particle size of lanthana has a strong effect on the field emission characteristics of cathode. The nanocomposite cathode has superior field electron emission ability than that of the coarse-grained cathode. The sites of field electron emission of the nanocomposite cathode nearly extend over the whole surface of cathode, whereas the emission sites of the coarse-grained cathode concentrate on a small area of the cathode surface. The reasons for the different distribution of emission sites were discussed. |
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