SOFT MODE ANOMALIES IN THE PEROVSKITE RELAXOR Pb(Mg{sub 1/3}Nb{sub 2/3})O{sub 3}

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Neutron inelastic scattering measurements of the polar TO phonon mode in the cubic relaxor Pb(Mg{sub 1/3}Nb{sub 2/3})O{sub 3}, at room temperature, reveal anomalous behavior similar to that recently observed in Pb(Zn{sub 1/3}Nb{sub 2/3}){sub 0.92}Ti{sub 0.08}O{sub 3} in which the optic branch appears to drop precipitously into the acoustic branch at a finite value of the momentum transfer q = 0.2 {angstrom}{sub {minus}1}, measured from the zone center. By contrast, a recent neutron study indicates that PMN exhibits a normal TO phonon dispersion at 800 K. The authors speculate this behavior is common to all relaxor materials, and is the result ... continued below

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GEHRING,P.M.; VAKRUSHEV,S.B. & SHIRANE,G. March 9, 2000.

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Neutron inelastic scattering measurements of the polar TO phonon mode in the cubic relaxor Pb(Mg{sub 1/3}Nb{sub 2/3})O{sub 3}, at room temperature, reveal anomalous behavior similar to that recently observed in Pb(Zn{sub 1/3}Nb{sub 2/3}){sub 0.92}Ti{sub 0.08}O{sub 3} in which the optic branch appears to drop precipitously into the acoustic branch at a finite value of the momentum transfer q = 0.2 {angstrom}{sub {minus}1}, measured from the zone center. By contrast, a recent neutron study indicates that PMN exhibits a normal TO phonon dispersion at 800 K. The authors speculate this behavior is common to all relaxor materials, and is the result of the presence of nanometer-scale polarized domains in the crystal that form below a temperature T{sub d}, which effectively prevent the propagation of long wavelength (q = 0) phonons.

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5 pages

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INIS; OSTI as DE00755043

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  • WORKSHOP ON FERROELECTRICS, ASPEN, CO (US), 02/14/2000--02/19/2000

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  • Report No.: BNL--67270
  • Report No.: KC020201
  • Grant Number: AC02-98CH10886
  • Office of Scientific & Technical Information Report Number: 755043
  • Archival Resource Key: ark:/67531/metadc706138

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  • March 9, 2000

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  • Sept. 12, 2015, 6:31 a.m.

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  • Nov. 9, 2015, 2:36 p.m.

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GEHRING,P.M.; VAKRUSHEV,S.B. & SHIRANE,G. SOFT MODE ANOMALIES IN THE PEROVSKITE RELAXOR Pb(Mg{sub 1/3}Nb{sub 2/3})O{sub 3}, article, March 9, 2000; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc706138/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.