周期数N不同的(Ce_(0.8)SmO_(2-δ))/YSZ)_N超晶格薄膜的阻抗性质  

Fabrications and electrochemical properties of superlattice (Ce_(0.8_SmO_(2-δ))/YSZ)_N electrolyte films

作　　者：贾晓静[1] 苏海莹[1] 刘华艳[1] 许彦彬[1] 康振峰 丁铁柱[1] Jia Xiao-Jing Su Hai-Ying Liu Hua-Yan Xu Yan-Bin Kang Zhen-Feng Ding Tie-Zhu(School of Physical Science and Technology, Inner Mongolia University, Hohhot 010021, China)

机构地区：[1]内蒙古大学物理科学与技术学院,呼和浩特010021

出　　处：《物理学报》2017年第1期272-278,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11264025)资助的课题~~

摘　　要：采用脉冲激光溅射技术,在MgO单晶片衬底上,以SrTiO_3作为缓冲层,交替沉积Ce_(0.8)Sm_(0.2)O_(2-δ)(SDC)和8 mol%Y_2O_3:ZrO_2(YSZ),制备了不同周期数的(SDC/YSZ)N超晶格电解质薄膜.利用扫描电子显微镜,X射线衍射和交流阻抗对其形貌、相结构和电学性能进行了表征.研究结果表明,薄膜具有优良的超晶格结构,层与层间的界面清晰.阻抗分析表明,周期数越多的样品显示出很小的活化能(约0.768 eV).该结果表明:周期数越多的SDC/YSZ超晶格是更为理想的低温固体氧化物燃料电池电解质.The growing demand for the energy conversion and storage of miniaturized system has promoted extensive researches aiming at fabricating solid-state ionic devices in thin-film form. Recent developments in the field of thin-film growth technologies have controlled the films at an atomic level of deposited layers, thus opening new perspectives in the field of engineering of multilayers and heterostructures based on complex oxides. This work focuses on the characterizations of the low-temperature properties of Ce（0.8）Sm（0.2）O（2-δ）/Y2O3：Zr O2（SDC/YSZ）Nsuperlattice films.（SDC/YSZ）Nsuperlattice electrolytic films with various periods（N = 4, 6, 10 and 20） are fabricated on monocrystal Mg O substrates by the pulsed laser sputtering method. Here, Si Tr O3（STO） is used as a buffer layer, SDC and YSZ are deposited alternately in the whole process. The total thickness values of samples are all fixed at 400 nm no matter how many periods the samples have. The surface morphologies, phase structures and electric properties of the as-deposited samples are characterized by scanning electron microscopy（SEM）, X-ray diffraction and alternating current（AC） impedance spectroscopy. It is indicated that the films have excellent superlattice structures after STO has been used as a buffer layer and the substrate temperature has heated to 700℃ The interface between two layers are clearly observed by SEM. Moreover, neither cracks nor snaps are found at the interface. The grains uniformly grow on the surfaces of films and are arranged into cylinder structures, leading to compact films. Through AC impedance analysis, the samples which have more periods exhibit smaller activation energies. With increasing the number of interfaces, the activation energy of film decreases whereas the ionic conductivity increases. When the number of periods reaches 20, the activation energy is measured to be approximately 0.768 eV. The conductivity enhancement of（SDC/YSZ）Nsuperlattice electrolyte film can be attributed t

关 键 词：(SDC/YSZ)N 超晶格薄膜 电导率 活化能 

分 类 号：O484.4[理学—固体物理]