A STUDY OF NONSTOICHIOMETRIC OXIDES IN THE Ln-Ni-O (Ln=La, Pr, Nd) SYSTEM

被引：0
|
作者：
Nedilko, Sergiy [1 ]
Dziazko, Olexander [1 ]
Kulichenko, Vadym [2 ]
Chornovol, Victoria [2 ]
机构：
[1] Taras Shevchenko Natl Univ Kyiv, Dept Chem, Volodymyrska St 64-13, UA-01601 Kiev, Ukraine
[2] Kyiv Natl Univ Bldg & Architecture, Dept Chem, UA-03680 Kiev, Ukraine
来源：
FRENCH-UKRAINIAN JOURNAL OF CHEMISTRY | 2015年 / 3卷 / 02期
关键词：
coprecipitation method; non-stoichiometric compositions; nickelates; rare earth oxides; K2NiF4;
D O I：
暂无
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
The non-stoichiometric compositions Ln(2-x)NiO(4-3x/2+delta) (Ln=La, Pr, Nd, 0 <= x <= 0,4) were obtained using coprecipitation method from nitrates solutions by K2CO3 followed by calcination of the obtained blend at 950 degrees C. According to X-ray phase analysis compositions in the range La2NiO4.17 -La1.6NiO3.63 are monophase and crystallize in tetragonal symmetry K2NiF4, space group I4/mmm. Nd2-xNiO4-y and Pr2-xNiO4-y in the range 0 <= x <= 0,2 are monophase and have orthorombic and monoclinic(correspodingly) distorted K2NiF4 structure. Samples with 0,2< x <= 0,4 are polyphase and contain Ln(2)NiO(4) ( Ln=Pr, Nd), NiO and rare earth oxides. Electrical conductivity of obtained samples has semiconducting behavior and it is strongly depended to nonstoichiometric oxygen content.
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页码：89 / 92
页数：4
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