Incorporation of Er3+ into BaTiO3

被引:81
作者
Buscaglia, MT [1 ]
Viviani, M
Buscaglia, V
Bottino, C
Nanni, P
机构
[1] CNR, Inst Energet & Interphases, Genoa, Italy
[2] Univ Genoa, Dept Proc & Chem Engn, Genoa, Italy
关键词
D O I
10.1111/j.1151-2916.2002.tb00313.x
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The incorporation of Er3+ into BaTiO3 ceramics was investigated on samples containing 0.25, 0.5, 1, 2, 8, and 10 at.% of dopant, after sintering at 1350-1550degreesC in air. For Er3+ concentrations less than or equal to1 at.%, dense and large-grained ceramics with low room-temperature resistivity (10(2)-10(3) Omega.cm) were obtained. The observed properties are largely independent of stoichiometry. Simultaneous substitution of Er3+ at both cation sites, with higher preference for the Ba site, is proposed. The behavior of heavily doped ceramics depends on stoichiometry. When Ba/Ti < 1, the electrical properties change from slightly semiconducting to insulating as Er concentration increases from 2 to 8 at.%. The ceramics have tetragonal perovskite structure and contain a large amount of Er2Ti2O7 pyrochlore phase. On the other hand, when Ba/Ti > 1, the ceramics are insulating, fine-grained, and single phase. In this case, incorporation of Er3+ predominantly occurs at the Ti site, with oxygen vacancy compensation. Incorporation is accompanied by a significant reduction of tetragonality and by expansion of the unit cell. The different results indicate that Er3+ solubility at the Ba site does not exceed 1 at.%, whereas solubility at the Ti site is at least 10 at.%. However, the incorporation of Er3+ and the resulting properties are also strongly affected by sintering conditions.
引用
收藏
页码:1569 / 1575
页数:7
相关论文
共 38 条
[1]  
Belous AG, 1998, INORG MATER+, V34, P597
[2]  
Belous AG, 1996, INORG MATER+, V32, P880
[3]   EFFECTS OF YTTRIUM DOPING ON THE GRAIN AND GRAIN-BOUNDARY RESISTIVITIES OF BATIO3 FOR POSITIVE TEMPERATURE-COEFFICIENT THERMISTORS [J].
BLANCHART, P ;
BAUMARD, JF ;
ABELARD, P .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1992, 75 (05) :1068-1072
[4]   EFFECTS OF GRAIN GROWTH ON DISTRUBUTION OF NB IN BATIO3 CERAMICS [J].
BUESSEM, WR ;
KAHN, M .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1971, 54 (09) :458-&
[5]   Influence of foreign ions on the crystal structure of BaTiO3 [J].
Buscaglia, MT ;
Buscaglia, V ;
Viviani, M ;
Nanni, P ;
Hanuskova, M .
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 2000, 20 (12) :1997-2007
[6]   Atomistic simulation of dopant incorporation in barium titanate [J].
Buscaglia, Maria Teresa ;
Buscaglia, Vincenzo ;
Viviani, Massimo ;
Nanni, Paolo .
2001, American Ceramic Soc, Westerville (84)
[7]   COMPENSATING DEFECTS IN HIGHLY DONOR-DOPED BATIO3 [J].
CHAN, HM ;
HARMER, MP ;
SMYTH, DM .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1986, 69 (06) :507-510
[8]   INTERFACIAL SEGREGATION IN PEROVSKITES .3. MICROSTRUCTURE AND ELECTRICAL-PROPERTIES [J].
DESU, SB ;
PAYNE, DA .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1990, 73 (11) :3407-3415
[9]   INTERFACIAL SEGREGATION IN PEROVSKITES .2. EXPERIMENTAL-EVIDENCE [J].
DESU, SB ;
PAYNE, DA .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1990, 73 (11) :3398-3406
[10]   REVERSIBLE WEIGHT CHANGE OF ACCEPTOR-DOPED BATIO3 [J].
HAGEMANN, HJ ;
HENNINGS, D .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1981, 64 (10) :590-594