An infrared spectroscopic study of the low-spin to intermediate-spin state (1A1-3T1) transition in rare earth cobaltates, LnCoO3 (Ln = La, Pr and Nd)

被引：56
|
作者：
Sudheendra, L
Seikh, MM
Raju, AR
Narayana, C
机构：
[1] Jawaharlal Nehru Ctr Adv Sci Res, Chem & Phys Mat Unit, Bangalore 560064, Karnataka, India
[2] Indian Inst Sci, Solid State & Struct Chem Unit, Bangalore 560012, Karnataka, India
来源：
CHEMICAL PHYSICS LETTERS | 2001年 / 340卷 / 3-4期
关键词：
D O I：
10.1016/S0009-2614(01)00439-0
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Low-spin (LS) to intermediate-spin (IS) state transitions in crystals of LnCoO(3) (Ln = La, Pr and Nd) have been investigated by variable temperature infrared spectroscopy. The spectra reveal the occurrence of the transition around 120, 220 and 275 K, respectively, in LaCoO3,PrCoo(3) and NdCoO3, at which temperatures the intensities of the stretching and the bending modes associated with the LS state decrease, accompanied by an increase in the intensities of the bands due to IS state. The characteristic frequencies of both the spin states decrease with increase in temperature, showing anomalies around the transition. (C) 2001 Published by Elsevier Science B.V.
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页码：275 / 281
页数：7
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