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New Intermediate Phases of the Composition La 2n+2 Cu n+4 O 4n+7 in the LaCuO System: the Crystal Structure and Thermal Stability of La 2 Cu 2 O 5
Author(s) -
Norrestam Rolf,
Nygren Mats,
Bovin JanOlov
Publication year - 1991
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.199108641
Subject(s) - homologous series , crystallography , phase (matter) , crystal structure , polyhedron , composition (language) , materials science , thermal , chemistry , mineralogy , physics , combinatorics , thermodynamics , mathematics , linguistics , philosophy , organic chemistry
The structure of the new LaCuO phase, La 2 Cu 2 O 5 , stable at 1075–1100°C, is characterized by La 2 CuO 4 layers two CuO octahedrons wide which share edges with the CuO polyhedrons of the separating “walls”. This construction led to the postulate that a homologous series (La 2n+2 Cu n+4 O 4n+7 ) exists, and besides La 2 Cu 2 O 5 (n = 2), La 8 Cu 7 O 19 (n = 3) has already been prepared and characterized structurally.