Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 64: Issue 3
A Thermal And Structural Study on Lanthanum Hexacyanocobaltate(III) Pentahydrate. Part II
Authors:
Y. Masuda Niigata University, t2-8050 Ikarashi Department of Environmental Science, Faculty of Science Niigata 950-2181 Japan Niigata 950-2181 Japan

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Y. Seto Niigata University Graduate School of Science and Technology 2-8050 Ikarashi Niigata 950-2181 Japan 2-8050 Ikarashi Niigata 950-2181 Japan

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X. Wang Niigata University Graduate School of Science and Technology 2-8050 Ikarashi Niigata 950-2181 Japan 2-8050 Ikarashi Niigata 950-2181 Japan

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Y. Tuchiya Niigata University Department of Physics, Faculty of Science 2-8050 Ikarashi Niigata 950-2181 Japan 2-8050 Ikarashi Niigata 950-2181 Japan

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Pages:
1045–1051
Online Publication Date:
02 Nov 2004
Publication Date:
01 Jun 2001
Article Category:
Research Article
DOI:
https://doi.org/10.1023/a:1011551803301
Keywords:
lanthanum hexacyanocobaltate(III); magnetic susceptibility; thermal structural and color change
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Abstract  

The thermal dehydration of La[Co(CN)6]⋅5H2O proceeded through at least three stages from the temperature range of30~230C, and an abrupt mass loss occurred around 350C and the perovskite type oxide,LaCoO3 was obtained at 1000C. After dehydration, the color of the anhydride changed from white to pale blue around 230C and furthermore, the color changed to blue around 290C. These color changes were discussed on the basis of the changes of coordination structures around Co ions. In La[Co(CN)6]⋅5H2O, Co3+ ions lie at the center of the Oh crystal field consisted of six CN– ions. However, in the pale blue specimen, Co3+ ions were situated in the center of D4h crystal field which was distorted the Oh one by lengthening of the trans CN– ions along z-axis. In the blue specimen, Co3+ ions were reduced to Co2+ ions which were situated in the Td crystal field formed by four CN–ions as [Co(CN)4]2–.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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