Gd_(0.2)Ce_(0.8)O_(1.9)氧离子导体陶瓷片的制备
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摘要
以草酸铈钆为初始原料,950℃煅烧处理后得到较大粒径的Gd_(0.2)Ce_(0.8)O_(1.9)粉体,经等静压成型,烧结,切片工艺制备规格100×100 mm的Gd_(0.2)Ce_(0.8)O_(1.9)氧离子导体陶瓷片,并分析试样的断口微观组织。测试结果显示,样品存在气孔,且晶粒之间接触紧密,相对密度92%以上,晶粒尺寸约为2.5μm～5μm,样品的断裂方式以穿晶断裂为主。通过阻抗分析仪测定了三个厚度(0.7 mm、0.9 mm、1.1 mm)的Gd_(0.2)Ce_(0.8)O_(1.9)陶瓷片的电导率。结果表明,随着温度的升高,Gd_(0.2)Ce_(0.8)O_(1.9)陶瓷片电导率逐渐增加,而厚度对陶瓷片电导率影响不大。
Gd_(0.2)Ce_(0.8)O_(1.9) powder with lager size was prepared by calcination of gadolinium cerium oxalate at 950 ℃. Through isostatic pressing and sintering of the powder, Gd_(0.2)Ce_(0.8)O_(1.9) oxygen ionic conductive ceramics were obtained. The fracture microstructure of the sample was analyzed. The results show that there are pores in the sample, and the crystal grains are in close contact with each other. The relative density is more than 92% and the grain size is about 2.5～5 μm. The fracture of the sample is dominated by transgranular fracture. The conductivity of Gd_(0.2)Ce_(0.8)O_(1.9) ceramic membranes with different thicknesses was determined by impedance analyzer. The results show that the conductivity of Gd_(0.2)Ce_(0.8)O_(1.9) ceramic membranes increases with the increase of temperature, while the thickness of the film has little effect on the conductivity of it.
Gd_(0.2)Ce_(0.8)O_(1.9) powder with lager size was prepared by calcination of gadolinium cerium oxalate at 950 ℃. Through isostatic pressing and sintering of the powder, Gd_(0.2)Ce_(0.8)O_(1.9) oxygen ionic conductive ceramics were obtained. The fracture microstructure of the sample was analyzed. The results show that there are pores in the sample, and the crystal grains are in close contact with each other. The relative density is more than 92% and the grain size is about 2.5～5 μm. The fracture of the sample is dominated by transgranular fracture. The conductivity of Gd_(0.2)Ce_(0.8)O_(1.9) ceramic membranes with different thicknesses was determined by impedance analyzer. The results show that the conductivity of Gd_(0.2)Ce_(0.8)O_(1.9) ceramic membranes increases with the increase of temperature, while the thickness of the film has little effect on the conductivity of it.
引文
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[3] 张志娟,劳令耳,范荣亮,陈平.CeO2基固体电解质制备方法概述[J].化学推进剂与高分子材料,2006,4(6):38-42.Zhang Z J,Lao L E,Fan R L,Chen P.Summary on preparation methods of CeO2-based solid electrolyte [J].Chemical Propellants & Polymeric Materials,2006,4(6):38-42.
[4] Choy K,Bai W,Charojrochkul S,Steele B C H.The development of intermediate temperature solid oxide fuel cells for the next millennium [J].Journal of Power Sources,1998,71(2):361-369.
[5] Doshi R,Richards V L,Carter J D,Wang X P.Development of solid oxide fuel cells that operate at 500 ℃[J].Cheminform,1999,30(28):1273-1278.
[6] Wang Z,Kale G M,Tang X.Sintering behaviour and ac conductivity of dense Ce0.8Gd0.2O1.9solid electrolyte prepared employing single-step and two-step sintering process[J].Journal of Materials Science,2014,49(8):3010-3015.
[7] 韩敏芳,彭苏萍,王玉倩,杨翠柏.纳米粉体制备8YSZ电解质工艺性能研究[J].功能材料与器件学报,2003,9(3):257-261.Han M F,Peng S P,Wang Y Q,Yang C B.Fabrication and properties of 8YSZ electrolyte from nanocrystalline fine powders [J].Journal of Function Materials and Devices,2003,9(3):257-261.
[8] Go′dickemeier M.Engineering of solid oxide fuel cells with ceria-based electrolytes[J].Journal of the Electrochemical Society,1998,145(2):414-421.
[9] Steele B C H.Appraisal of Ce1-yGdyO2-y/2 electrolyte for IT-SOFC operation at 500 ℃[J].Solid State Ionics,2000,129(1-4):95-110.
[10] Mori M,Suda E,Pacaud B,Murai K.Effect of components in electrodes on sintering characteristics of Ce0.9Gd0.1O1.95 electrolyte in intermediate-temperature solid oxide fuel cells during fabrication[J].J Power Sources,2006,157(2):688-694.
[11] Mogensen M,Sammes N M,Tompsett G A.Physical,chemical and electrochemical properties of pure and doped ceria.Solid State Ionics,2000,129(1-4):63-69.
[12] 刘燕祎,潘伟,李彬,陈争辉.Sm2O3和Nd2O3共同掺杂CeO2基电解质材料的研究[J].稀有金属材料与工程,2007,36(S2):609-612.Liu Yanwei,Pan Wei,Li Bin,Chen Z H.Study on Sm2O3and Nd2O3 Co-doped Ceria Based Electrolyte [J].Rare Metal Materials and Engineering,2007,36(s2):609-612.
[13] Inaba H,Tagawa H.Ceria-based solid electrolytes[J].Solid State Ionics,1996,83(1):1-16.
[14] Christie G M,Berkel F P F V.Microstructure-ionic conductivity relationships in ceria-gadolinia electrolytes[J].Solid State Ionics,1996,83(1):17-27.
[15] 李艳华,于战华,冷静,刘晓梅.溶胶-凝胶法制备两种中温SOFC电解质材料[J].中国稀土学报,2005,23:182-184.Li Y H,Yu Z H,Leng J,Liu X M.Two kind of electrolyte materials intermedium-temperature SOFC prepared by sol-gel method[J].Journal of Rare Earths,2005,(s2):182-184.