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X-ray study on the lattice strains of ferroelectric iron iodine boracite Fe3B7O13I

Kobayashi, Jinzo
Mizutani, Isao
Schachner, Herbert
Published in Physical Review. B, Condensed Matter. 1970, vol. 1, no. 9, p. 3801-3808
Abstract The accurate lattice parameters and the extremely small lattice strains of Fe I boracite, Fe3B7O13I, have been successfully measured over the paraelec. and the ferroelec. regions by using special x-ray diffraction methods. The spontaneous strains in the ferroelec. state could be sepd. into 2 parts, a linear strain (pure shear) and quadratic ones (electrostrictions). It is a conspicuous feature of the electromech. properties of Fe2B7O13I that the electrostrictions prevail over the linear strain induced through a torsional piezoelec. const. b36 of the paraelec. phase. The electrostrictive consts. are approx. 2 orders of magnitude larger than those of KH2PO4. Another phase transformation at a lower temp. was disclosed by the present diffractometry. At this temp., a special rhombohedral lattice is formed, and the piezo-elec. const. b36 vanishes.
Keywords ElectrostrictionPiezoelectricityLattice strain iron iodine boracite
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KOBAYASHI, Jinzo et al. X-ray study on the lattice strains of ferroelectric iron iodine boracite Fe3B7O13I. In: Physical Review. B, Condensed Matter, 1970, vol. 1, n° 9, p. 3801-3808.

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