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Layered double hydroxide stability. 2. Formation of Cr(III)-containing layered double hydroxides directly from solutionSolutions containing divalent metal [M(II) = Mg2+, Zn2+, Co2+, Ni2+, Mn2+] chlorides and CrCl3 6H2O were titrated with NaOH to yield, for M(II) = Zn, Co, and Ni, hydrotalcite-like layered double hydroxides (LDHs), [[M(II)]1-z[Cr(III)]z(OH)2][Cl]z yH2O, in a single step, without intermediate formation of chromium hydroxide. Analysis of the resultant titration curves yields solubility constants for these compounds. These are in the order Zn < Ni approximately Co, with a clear preference for formation of the phase with z = 1/3. With Mg2+ as chloride, titration gives a mixture of Cr(OH)3 and Mg(OH)2, but the metal sulfates give Mg2Cr(OH)6 1/2(SO4) by a two-step process. Titrimetric and spectroscopic evidence suggests short-range cation order in the one-step LDH systems.
Document ID
20040089020
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Boclair, J. W.
(University of North Texas Denton 76203-5070, United States)
Braterman, P. S.
Jiang, J.
Lou, S.
Yarberry, F.
Date Acquired
August 21, 2013
Publication Date
January 1, 1999
Publication Information
Publication: Chemistry of materials : a publication of the American Chemical Society
Volume: 11
Issue: 2
ISSN: 0897-4756
Subject Category
Exobiology
Funding Number(s)
CONTRACT_GRANT: NAGW-4620
Distribution Limits
Public
Copyright
Other
Keywords
Non-NASA Center
NASA Discipline Exobiology

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