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.

引用

页码：89 / 92

页数：4

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