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Memory Effect of Calcined Layered Samarium Hydroxychlorides in Aqueous Solution #
Author(s) -
Lee ByungIl,
Byeon SongHo
Publication year - 2015
Publication title -
bulletin of the korean chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.237
H-Index - 59
ISSN - 1229-5949
DOI - 10.1002/bkcs.10149
Subject(s) - calcination , aqueous solution , samarium , inorganic chemistry , chemistry , layered double hydroxides , decomposition , intercalation (chemistry) , metal , salt (chemistry) , catalysis , organic chemistry , hydroxide
The decomposition and recovery behavior of layered samarium hydroxychloride (Sm 2 ( OH ) 5 Cl · n H 2 O, LSmH) has been closely studied in various conditions. Although the heat treatment of LSmH at 700 °C completely collapsed typical layered structure, the calcined LSmH (c‐LSmH) recovered its layered characteristics and consequently its ability to intercalate anions into the interlayer space when it was rehydroxylated and rehydrated in aqueous solutions containing organic and inorganic anions. This phenomenon is similar to the memory effect observed in classical layered double hydroxides (LDHs), where LDHs calcined to a mixture of metal oxides can recover their layered structures in aqueous solutions. In contrast, the recovery reaction of c‐LSmH in water without any counter anions was unsuccessful and instead resulted in the formation of Sm(OH) 3 . Such a difference was interpreted on the basis of the salt effect on Sm 2 (OH) 5 Cl· n H 2 O–Sm(OH) 3 phase equilibria in water.