High Pressure Cell for Infrared and Raman Gas-Solid Reaction Mechanism Studies

High dielectric constant and capacitance in ultrasmall (2.5 nm) SrHfO3 perovskite nanoparticles produced in a low temperature non-aqueous sol–gel route

“…According to literature, orthorhombic SrHfO 3 with the Pbnm space group exhibits 24 Raman active modes (7 Ag + 5B 1g + 7B 2g + 5B 3g ), 25 IR active modes (9B 1u + 7B 2u + 9B 3u ) and 3 translational modes (B 1u + B 2u + B 3u ). 19,60,61 The observed peaks match well with literature, conrming the orthorhombic phase. Compared to the as-synthesised NPs, the sample annealed at 800 C shows well dened bands around 141, 163, 418, 446, 594 cm À1 , which were assigned to the A g , B 1g , A g , B 2g , Ag modes, respectively, as well as minor peaks at 222, 280 and 398 cm À1 corresponding to A g , B 3g and B 2g .…”

Raman spectrometry

“…Rotating cells for photosensitive samples continue to be used (30,31) and have been modified to allow measurement to be made at low temperature (32). High pressure Raman spectrometry has been reviewed (33) and cells for liquids (34,35) and solids (36) have been described. A useful method for selecting diamonds for anvil pressure cells has been devised (37).…”