ISSN:
1600-5724
Quelle:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Thema:
Chemie und Pharmazie
,
Geologie und Paläontologie
,
Physik
Notizen:
A single crystal of stoichiometric lithium niobate has been studied, using high-resolution synchrotron X- rays, under an electric field applied along the polar crystallographic c direction. A crystalline plate, 0.2 mm thick along the c direction, was polarized by a ±900 V square wave of frequency 50 and 230 Hz. Electronic gating ensured that the scattered intensities were recorded only during the central 50% of the square-wave duration. The results show that the stoichiometric crystals have surface layers under the Al electrodes that differ in the c cell dimension from the bulk by about Δc/c = 6 × 10-4, The resulting c lattice vector is close in length to that of congruent Li0.941Nbl.012O3, although the composition of the surface layer may only be inferred; modification by Al in-diffusion may also be possible. The surface-layer thickness is estimated to be of the order of 0.01 mm.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1107/S0108767390001106
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