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Preparation of solid electrolyte nano-sized powders and examination of relationship between oxide tonic conductivity and nano- structural features in sintered bodies

固体电解质纳米粉末的制备及氧化物渗透电导率与烧结体纳米结构特征之间关系的研究

基本信息

批准号：
15510084
负责人：
MORI Toshiyuki
金额：
$ 2.37万
依托单位：
National Institute for Materials Science
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2006
项目状态：
已结题

项目摘要

For a design of high quality doped CeO_2 solid electrolytes, the oxide tonic conductivity must be maximized and the n-type semi-conducting property must be minimized into the specimens. In order to achieve them, we observed the micro-structure at atomic scale. Also we examined the relationship between electrical conductivity and micro-structural features in the doped CeO_2 sintered bodies. In the present study, we prepared the 20 kinds of specimens which are the electrolytes (Sm_xCe_<1-x>O_<2-x/2> and Gd_xCe_<1-x>O_<2-x/2>, x=0.05, 0.1, 0.15, 0.2 and 0.25) and n-type semi-conductors (Ho_xCe_<1-x>O_<2-x/2> and Tb_xCe_<1-x>O_<2-x/2>, x=0.05, 0.1, 0.15, 0.2 and 0.25) to examine the relationship between physical properties (i.e. electrical conductivity, activation energy, and so on) of sintered bodies and nano-structural features in sintered bodies. The average particle size of powders prepared by carbonate co-precipitation method was approximately sonm. The aforementioned specimens were d … More ensified more than 95 % of theoretical density. The conductivity in the sintered bodies was measured using direct current measurement method. The observation of micro-structural features at atomic scale was performed using transmission electron microscopy (TEM). The micro-domains with ordered structure of oxygen vacancy were observed in the electrolytes (i.e. Sm_xCeCe_<1-x>O_<2-x/2> and Gd_xCe_<1-x>O_<2-x/2>. The conductivity in those sintered bodies was decreased with increasing micro-domain content and micro-domain size. On the other hand, the small precipitates were observed in Ho_xCe_<1-x>O_<2-x/2> and Tb_xCe_<1-x>O_<2-x/2> sintered bodies. The huge amount of Ce^<3+> and do pant cation was observed into the precipitates. In the case of Ho_xCe_<1-x>O_<2-x/2> and Tb_xCe_<1-x>O_<2-x/2> sintered bodies, the typical n-type semi-conducting property was observed. Accordingly, for a design of high quality doped CeO_2 solid electrolytes, it is concluded that the micro-domain size must be minimized in the doped CeO_2 sintered bodies and the precipitates must be removed from the doped CeO_2 sintered bodies. Less

为了设计高质量的掺杂CeO_2固体电解质，必须使样品的氧化物电导率最大化，并使n型半导体性质最小化。为了实现这些目标，我们在原子尺度上观察了微观结构。研究了掺杂CeO_2烧结体的电导率与显微结构的关系。本研究制备了20种电解质（Sm_xCe_<1-x>O_<2-x/2>和Gd_xCe_<1-x>O_<2-x/2>，x=0.05，0.1，0.15，0.2和0.25）和n型半导体（Ho_xCe_<1-x>O_<2-x/2>和Tb_xCe_ O_<1-x><2-x/2>，x=0.05，0.1，0.15，0.2和0.25）样品，研究了烧结体的物理性能（如电导率、活化能等）与烧结体纳米结构特征之间的关系。碳酸盐共沉淀法制备的粉体平均粒径约为3 nm。对上述标本进行了组织学观察， ...更多信息强化95%以上的理论密度。使用直流测量方法测量烧结体中的电导率。利用透射电子显微镜（TEM）在原子尺度上进行微观结构特征的观察。在电解质Sm_xCeCe_<1-x>O_<2-x/2>和Gd_xCe_<1-x>O_<2-x/2>中观察到具有有序氧空位结构的微畴。随着微畴含量和尺寸的增加，烧结体的电导率降低。而在Ho_xCe_<1-x>O_<2-x/2>和Tb_xCe_<1-x>O_<2-x/2>烧结体中观察到了细小的析出相。在沉淀物中观察到大量的Ce^<3+>和dopant阳离子。在Ho_xCe_<1-x>O_（2-x/2）和Tb_xCe_<1-x>O_（2-x/2）烧结体中，观察到典型的n型半导体特性。因此，为了设计高质量的掺杂CeO_2固体电解质，必须最大限度地减小掺杂CeO_2烧结体中的微畴尺寸，并去除掺杂CeO_2烧结体中的沉淀物。少