Premium
High‐pressure Synthesis of PbCrO 3
Author(s) -
DeVRIES R. C.,
ROTH W. L.
Publication year - 1968
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1968.tb11839.x
Subject(s) - octahedron , valence (chemistry) , high pressure , crystallography , materials science , phase (matter) , mineralogy , chemistry , crystal structure , thermodynamics , organic chemistry , physics
A new compound with the composition PbCrO 3 , with Cr in the valence state of 4, was synthesized at high pressures above a pressure‐temperature line extending from about 50 kbars at 750°C to 60 kbars at 1450°C. PbCrO 3 can be quenched and retained at 1 atm but decomposes on heating above 275° C at the same pressure. PbCrO 3 is considered to be an equilibrium phase at high pressures because it was synthesized from mixtures of PbO: CrO 2 as well as from several other mixtures of compounds in the Pb‐Cr‐0 system. The new phase has the cubic perovskite structure and is the only known compound with Cr 4+ in an octahedral site. PbCrO 3 crystallizes primarily as black cubes which are often twinned on (111).