Open AccessNeutron and electron diffraction studies of La(Zn 1/2 Ti 1/2 )O 3 perovskite
Author(s) -
Hu Yi,
Ubic Rick,
Abrahams Isaac
Publication year - 2006
Publication title -
acta crystallographica section b
Language(s) - English
Resource type - Journals
eISSN - 1600-5740
pISSN - 0108-7681
DOI - 10.1107/s0108768106015527
Subject(s) - neutron diffraction , materials science , perovskite (structure) , electron diffraction , impurity , crystallography , diffraction , rietveld refinement , reflection (computer programming) , analytical chemistry (journal) , crystal structure , chemistry , optics , physics , chromatography , programming language , organic chemistry , computer science
The crystallography and microwave dielectric properties of La(Zn 1/2 Ti 1/2 )O 3 (LZT) ceramics prepared via the mixed‐oxide route were investigated in this study. While samples were largely single phase, small amounts of ZnO impurity were detected in sintered pellets. Observed reflections in electron and neutron diffraction patterns indicate that the symmetry of LZT is P 2 1 / n . The B site is ordered on {110} or pseudocubic {111}, but the presence of the pseudocubic (111) reflection is in itself insufficient to indicate the existence of such order. Rietveld refinements of the neutron diffraction data yield an excellent fit for such a model. The structure is highly twinned, with variants related through common {211} composition planes and 90° rotations about 〈011〉. The microwave dielectric properties measured were ɛ r = 34, Qf = 36 090 and τ f = −70 MK −1 .