钐钕共掺杂氧化铈纳米粉体的制备及烧结行为
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摘要
采用固液复合法合成了钐钕共掺杂的氧化铈(Sm_(0.075)Nd_(0.075)Ce_(0.85)O_(2-δ):SNDC)。研究了球磨罐、球磨珠材质和球磨转速对粉体物相、成分、形貌及烧结行为的影响。结果表明:制备的SNDC物相纯净,为近似球型的纳米粉体。采用聚四氟乙烯罐和氧化锆球磨珠所制粉体纯度高。采用氧化铝球磨罐或球磨珠会引入杂质Al、Si和Ca。采用氧化铝罐和氧化锆球磨珠会额外引入Zr和Y,且球磨转速400 r/min杂质引入量高于300 r/min的。掺杂YSZ明显抑制了SNDC烧结,Al_2O_3可促进SNDC烧结,降低烧结致密温度约200℃。
Sm~(3+) and Nd~(3+) co-doped ceria(Sm_(0.075)Nd_(0.075)Ce_(0.85)O_(2-δ): SNDC) nanopowder was synthesized by a solid-liquid compound method. The influences of mortar material, milling-ball material and ball-milling speed on the phase, morphology, chemical composition and sintering behavior of SNDC powder were investigated. The results show that all the obtained powders are single-phase SNDC nano-particles with an approximately spherical morphology. A high-purity powder can be obtained when PTFE mortar and zirconia balls are used, but the powder contains some impurities of Al, Si and Ca when Al_2O_3 mortar or balls are used. The powder prepared with Al_2O_3 mortar and zirconia balls contains extra Zr and Y, and the concentration of impurity increases when the milling-speed increases from 300 to 400 r/min. It is also indicated that YSZ inhibites the sintering of SNDC, while Al_2O_3 accelerates the process and consequently reduces the temperature of densifying SNDC bulks by 200 ℃.
Sm~(3+) and Nd~(3+) co-doped ceria(Sm_(0.075)Nd_(0.075)Ce_(0.85)O_(2-δ): SNDC) nanopowder was synthesized by a solid-liquid compound method. The influences of mortar material, milling-ball material and ball-milling speed on the phase, morphology, chemical composition and sintering behavior of SNDC powder were investigated. The results show that all the obtained powders are single-phase SNDC nano-particles with an approximately spherical morphology. A high-purity powder can be obtained when PTFE mortar and zirconia balls are used, but the powder contains some impurities of Al, Si and Ca when Al_2O_3 mortar or balls are used. The powder prepared with Al_2O_3 mortar and zirconia balls contains extra Zr and Y, and the concentration of impurity increases when the milling-speed increases from 300 to 400 r/min. It is also indicated that YSZ inhibites the sintering of SNDC, while Al_2O_3 accelerates the process and consequently reduces the temperature of densifying SNDC bulks by 200 ℃.
引文
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[2]WU W C,HUANG J T,CHIBA A.Synthesis and properties of samaria-doped ceria electrolyte for IT-SOFCs by EDTA-citrate complexing method[J].J Power Sources,2010,195(8):5868-5874.
[3]KARACA T,ALTIN?EKI?T G,FARUK F M.Synthesis of nanocrystalline samarium-doped Ce O2(SDC)powders as a solid electrolyte by using a simple solvothermal route[J].Ceram Inter,2010,36(3):1101-1107.
[4]LIU A Z,TAO Y K,HE C R,et al.Synthesis and characterization of Gd0.1Ce0.9O1.95 nanopowder via an acetic–acrylic method[J].Ceram Inter,2013,39(6):6229-6235.
[5]TAO Y K,SHAO J,WANG J X,et al.Morphology control of Ce0.9Gd0.1O1.95 nanopowder synthesized by sol–gel method using PVP as a surfactant[J].J Alloys Compds,2009,484(1-2):729-733.
[6]JUD E,ZHANG Z L,SIGLE W,et al.Microstructure of cobalt oxide doped sintered ceria solid solutions[J].J Electroceram,2006,16(3):191-197.
[7]GIL V,TARTAJ J,MOURE C,et al.Effect of Bi2O3 addition on the sintering and microstructural development of gadolinia-doped ceria ceramics[J].J Eur Ceram Soc,2007,27(2-3):801-805.
[8]JUD E,HUWILER C B,GAUCKLER L J.Sintering analysis of undoped and cobalt oxide doped ceria solid solutions[J].J Am Ceram Soc,2005,88(11):3013-3019.
[9]ZHANG T S,KONG L B,ZENG Z Q,et al.Sintering behavior and ionic conductivity of Ce0.8Gd0.2O1.9 with a small amount of Mn O2doping[J].J Solid State Electrochem,2003,7(6):348-354.
[10]OMAR S,ERIC D W,NINO C J.Higher conductivity Sm3+and Nd3+co-doped ceria-based electrolyte materials[J].Solid State Ion,2008,178(37/38):1890-1897.
[11]LEE J S,CHOI K H,RYU B K,et al.Effects of alumina additions on sintering behavior of gadolinia-doped ceria[J].Ceram Inter,2004,30(5):807-812.
[12]GAO Z,LIU X M,BILL B,et al.Comparative study of Ce0.85Sm0.075Nd0.075O2-δelectrolyte synthesized by different routes[J].J Alloys Compds,2011,509(35):8720-8727.
[13]LI B,LIU Y Y,WEI X,et al.Electrical properties of ceria Co-doped with Sm3+and Nd3+[J].J Power Sources,2010,195(4):969-976.
[14]KHAN M Z,MEHRAN M T,SONG R H,et al.Effect of GDC interlayer thickness on durability of solid oxide fuel cell cathode[J].Ceram Inter,16,42(6):6978-6984.
[15]SHA X Q,LüZ,MIAO J P,et al.Influence of the sintering temperature on electrical property of the Ce0.8Sm0.1Y0.1O1.9electrolyte[J].J Alloys Compds,2007,433(1/2):274-278.