Journal ArticleDOI
Über die systeme alkalimetallbromid/kobalt(II)-bromid
H.J. Seifert,I. Al-Khudair +1 more
TLDR
In this article, the difference-thermal analysis of CoBr2 was used to investigate the system of alkalibromide/CoBr2 by means of differencethermal-analysis.About:
This article is published in Journal of Inorganic and Nuclear Chemistry.The article was published on 1975-07-01. It has received 43 citations till now. The article focuses on the topics: Miscibility.read more
Citations
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Journal ArticleDOI
New Ferroelectric K2ZnBr4
TL;DR: In this article, the phase transition sequence of a K 2 ZnBr 4 crystal was investigated by DTA and dielectric measurements, and it was found that the crystal undergoes at least two phase transitions, at -118°C and around 200°C, on heating.
Journal ArticleDOI
Über die Systeme AJ/CoJ2 und die kristallchemischen Beziehungen in der Gruppe der Doppelhalogenide AnCoX(n+2) mit X = Cl, Br, J [1]
H. J. Seifert,L. Stäudel +1 more
TL;DR: In this article, the results close presently existing gaps in the knowledge on systems of CoBr2 and CoCl2 too, and the systems of NaI and AgI are found to be eutectical.
Journal ArticleDOI
Investigation of phase diagrams by DTA and X-ray methods: The systems AX/CoX2 (A = Na-Cs, TI;X = Cl, Br, I)
TL;DR: In this paper, a combination of differential thermal analysis and X-ray structure analysis is used to investigate the formation of double halides in complicated systems of CoX 2 (X = Cl, Br.I) and TlBr/CoBr 2.
Journal ArticleDOI
Incommensurate-Commensurate Transition in K2ZnBr4 and K2CoBr4
TL;DR: In this paper, the structural phase transitions of K 2 ZnBr 4 and K 2 CoBr 4 are investigated by means of X-ray scattering, and it is found that the β phase is an incommensurate one with the modulation wave vector q =(1/3-δ) c *, which is followed by a normal phase of Pmcn above 288°C (Zn-salt) or 282°C(Co-sALT).
Journal ArticleDOI
Some stereochemical criteria concerning the structural stability of A2BX4 compounds of type β-K2SO4
J. Fábry,J. M. Perez-Mato +1 more
TL;DR: In this paper, a survey of available structural data indicates that the low-temperature structural instability of a good number of these compounds is related to the coordination of this short bond, which is often the shortest cation-anion contact in the structure.
References
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Journal ArticleDOI
The Electronic Structures of Tetrahedral Cobalt(II) Complexes
Journal ArticleDOI
Crystal‐Field Spectra of d3, d7 Ions. II. KCoF3, CoCl2, CoBr2, and CoWO4
J. Ferguson,D. L. Wood,K. Knox +2 more
TL;DR: In this article, detailed absorption spectra of crystals containing cobalt (II) in octahedral or slightly distorted octagonal sites are reported and the assignments of the doublet states are discussed in relation to a four-parameter crystal field theory.
Journal ArticleDOI
Ground State of Divalent Co Ions in Cs3CoCl5 and Cs3CoBr5
TL;DR: In this paper, the 4A2 ground state of tetrahedrally coordinated divalent cobalt ions in Cs3CoCl5 and Cs 3CoBr5 was investigated with magnetic-susceptibility measurements and paramagnetic resonance in pulsed magnetic fields up to 90 kOe at frequencies in the 70 and 120 Gc/sec bands.
Journal ArticleDOI
A least-squares refinement of the crystal structure of tricaesium pentachlorocobalt(II), Cs3CoCl5
Journal ArticleDOI
Über die Systeme Alkalimetallchlorid/Kobalt(II)‐chlorid
Abstract: CsCl und CoCl2 bilden ein vierfach eutektisches System mit den Verbindungen Cs3CoCl5, Cs2CoCl4 und CsCoCl3. Zwei weitere Verbindungen — Cs5Co2Cl9 und Cs3Co2Cl7 — zersetzen sich im festen Zustand.
Im System RbCl/CoCl2 liegen vor: Drei Eutektika, die Verbindungen Rb2CoCl4 und RbCoCl3, sowie die Verbindung Rb3CoCl5, mit deren Schmelzpunkt ein Peritektikum zusammenfallt. Rb2CoCl4 besitzt einen Umwandlungspunkt.
Aus KCl und CoCl2 bilden sich das kongruent schmelzende K2CoCl4 und das inkongruent schmelzende KCoCl3, das noch einen Umwandlungspunkt besitzt. Dazu gehoren zwei Eutektika und das Peritektikum.
Das schon beschriebene Diagramm des Systems NaCl/CoCl2 konnte bestatigt werden.
Zwischen LiCl und CoCl2 herrscht auf der LiCl-reichen Seite Mischkristallbildung mit Minimum, die dann auf der CoCl2-reichen Seite in ein Peritektikum ubergeht. In der Mischungslucke bilden sich bei tieferen Temperaturen die Verbindungen Li4CoCl6, Li2CoCl4 und LiCoCl3.
Der Schmelzpunkt des CoCl2 wurde neu bestimmt.
Das Verhalten der Verbindungen gegen Feuchtigkeit und einige Losungsmittel wird beschrieben. Hinweise uber die moglichen Strukturen werden gegeben.
CsCl and CoCl2 form a fourfold eutectical system with the compounds Cs3CoCl5, Cs2CoCl4 and CsCoCl3. Two other compounds – Cs5Co2Cl9 and Cs3Co2Cl7 – decompose in the solid state.
In the system RbCl/CoCl2 there are: Three eutectics, the compounds Rb2CoCl4 and RbCoCl3, further on the compound Rb3CoCl5, the melting point of which is also a peritectic. Rb2CoCl4 has a transition point.
The system KCl/CoCl2 shows the congruently melting compound K2CoCl4, the incongruently melting KCoCl3 (with a transition point in the solid state), two eutectics and a peritectic.
For NaCl and CoCl2 the same diagram was found as already described in literature.
LiCl and CoCl2 form mixed crystals with a minimum on the LiCl-side; on the CoCl2-side there is an peritectical system. At lower temperature, a miscibility gap exists. In the space of this miscibility gap the compounds Li4CoCl6, Li2CoCl4 and LiCoCl3 are formed.
The melting point of CoCl2 has been newly determined. The effects of moisture and some solvents on these compounds are described.
References to the possible structures are given.