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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

对于高质量掺杂CeO_2固体电解质的设计，必须最大化氧化物的紧张性和最小化样品的n型半导体性能。为了实现这一点，我们在原子尺度上观察了其微观结构。我们还研究了掺杂CeO2烧结体的电导率与微结构特征之间的关系。在本研究中，我们制备了20种样品，它们是电解液(Sm_xCe_&lt；1-x&gt；O_&lt；2-x/2&gt；1-x&gt；O_&lt；2-x/2&gt；，x=0.05，0.1，0.15，0.2和0.25)和n型半导体(Ho_xCe_&lt；1-x&gt；O_x&lt；2-x/2&gt；和Tb_xCe_&lt；1-x&gt；O_&lt；2-x/2&gt；，x=0.05、0.1、0.15、0.2和0.25)，以考察烧结体的物理性能(即电导率、激活能等)与烧结体的纳米结构特征之间的关系。碳酸盐共沉淀法制备的粉末平均粒径约为10 mm。上述标本均为d…。更敏化理论密度的95%以上。用直流电测法测量了烧结体的电导率。用透射电子显微镜观察了其原子尺度上的微观结构特征。在Sm_xCeCe_&lt；1-x&gt；O_&lt；2-x/2&gt；和Gd_xCe_&lt；1-x&gt；O_&lt；2-x/2&gt；随着微区含量的增加和微区尺寸的增大，烧结体的电导率降低。另一方面，在Ho_xCe_&lt；1-x&gt；O_&lt；2-x/2&gt；和Tb_xCe_&lt；1-x&gt；O_&lt；2-x/2&gt；烧结体中观察到细小的析出物。在沉淀物中观察到大量的Ce~(2+)和阳离子。在Ho_xCe_&lt；1-x&gt；O_&lt；2-x/2&gt；Tb_xCe_&lt；1-x&gt；O_&lt；2-x/2&gt；烧结体的情况下，观察到典型的n型半导体性能。因此，为了设计高质量的CeO_2掺杂固体电解质，必须使掺杂CeO_2烧结体的微区尺寸最小，并且必须去除掺杂CeO_2烧结体中的析出物。较少