Premium
Synthesis, structure, and properties of LaSrCuGaO 5
Author(s) -
Vaughey J. T.,
Wiley J. B.,
Poeppelmeier K. R.
Publication year - 1991
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19915980130
Subject(s) - brownmillerite , strontium , orthorhombic crystal system , lanthanum , crystallography , chemistry , gallium , crystal structure , paramagnetism , magnetic susceptibility , oxygen , copper , lattice (music) , tetrahedron , perovskite (structure) , lattice constant , inorganic chemistry , condensed matter physics , diffraction , physics , organic chemistry , acoustics , optics
The new brownmillerite‐related compound, LaSrCuGaO 5 , has been synthesized and characterized. It crystallizes in the orthorhombic non‐centrosymmetric space group Ima2. The unit cell dimensions are a = 16.383(1) Å, b = 5.5293(7) Å, c = 5.3275(6) Å. The structure is related to perovskite but contains ordered oxygen vacancies within the two‐dimensional gallium oxygen layers resulting in tetrahedral coordination of the gallium cations. Other important structural features include buckled copper‐oxygen planes, and disorder of the lanthanum and strontium cations over the A‐site. Accurate lattice constant measurements reveal an a‐axis expansion of 0.17 Å when doped with strontium La 1–x Sr 1+x CuGaO 5 (x max = 0.13). Magnetic susceptibility measurements demonstrate that the compound remains paramagnetic to 4 K.