Cl. Larochelle et al., Optical, synchrotron X-ray and neutron diffraction investigations of structural changes in the layered compound K2Na[Ag(CN)(2)](3), SOL ST COMM, 114(3), 2000, pp. 155-160
We report a study of single-crystal Raman scattering, powder synchrotron X-
ray and neutron diffraction as well as specific heat for the layered compou
nd K2Na[Ag(CN)(2)](3) in the temperature range 2-300 K. Analysis of the Ram
an scattering data provides evidence for structural changes at approximatel
y 210 K. Synchrotron X-ray and neutron powder diffraction results indicate
essential, gradual changes with temperature in the range from 1.5 to 300 K
and in particular small, but significant deviations from trigonal symmetry
of the pseudo-hexagonal lattice parameters a = a(ortho)/root 3, b below app
roximately 210 K. The c-lattice parameter increases anomalously with decrea
sing temperature. (C) 2000 Elsevier Science Ltd. All rights reserved.