Electronic Resource
Woodbury, NY
:
American Institute of Physics (AIP)
Applied Physics Letters
58 (1991), S. 2334-2335
ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
An apparent transition between active and nonactive second-harmonic generation (SHG) has been discovered in the NaNb3O8 solid solutions with the tetragonal tungsten bronze structure. No SHG was detected in 0.35Na2O:Nb2O5 solid solution crystal or its powder. Nevertheless, powder SHG with a magnitude comparable to KH2PO4 was observed when a small amount of Nb2O5 was added to the powder ground from the crystal and sintered again. Microcracks and ferroelectric domain boundaries have been observed in the crystal using transmission electron microscopy. The only difference between the lattice images of SHG active powder and non-SHG active powder is the absence of microcracks and ferroelectric domain boundaries in the SHG active powder. Dielectric constant of the 0.35Na2O:Nb2O5 crystal is about 300 and δ is 0.003 for frequency from 120 kHz to 12 MHz.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.104913
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