Inelastic neutron scattering study of the relaxor ferroelectric PbMg Nb O at high temperatures

Набережнов, А. А.; Vakhrushev, S. B.; Dörner, B.; Strauch, D.; Moudden, H.

doi:10.1007/s100510050912

Cited by 140 publications

(136 citation statements)

References 2 publications

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“…It was also found that with zero electric field cooling, PMN undergoes a transition into a random-bond-driven glassy state instead of a ferroelectric state. 21 This system has been intensively investigated in recent years, 22,23 and a more detailed description on this compound can be found in the review article by Ye. 20 Until recently the accepted picture was that PMN remains cubic through its apparent T C of 220 K. The recent neutron scattering paper by Wakimoto et al 24 changed the picture.…”

Section: Discussionmentioning

confidence: 99%

Ground state of the relaxor ferroelectricPb(Zn1/3Nb
Xu
¹
,
Zhong
²
,
Bing
³

et al. 2003
Phys. Rev. B
86
9
77
1
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Access and use of this website and the material on it are subject to the Terms and Conditions set forth at Ground state of the relaxor ferroelectric Pb(Zn1/3Nb2/3)O3 Xu, Guangyong; zhang, Z.; Bing, Y.; Ye, Z.-G.; Stock, C.; Shirane, G.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=fr L'accès à ce site Web et l'utilisation de son contenu sont assujettis aux conditions présentées dans le site LISEZ CES CONDITIONS ATTENTIVEMENT AVANT D'UTILISER CE SITE WEB. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1103/PhysRevB.67.104102Physical Review B, 67,10 High energy x-ray diffraction measurements on Pb(Zn 1/3 Nb 2/3 )O 3 ͑PZN͒ single crystals show that the system does not have a rhombohedral symmetry at room temperature as previously believed. The phase ͑X͒ in the bulk of the crystal gives Bragg peaks similar to that of a nearly cubic lattice with a slight tetragonal distortion. The Bragg profile remains sharp with no evidence of size broadening due to the polar microcrystals. However, in our preliminary studies of the skin, we have found the expected rhombohedral ͑R͒ phase as a surface state. On the other hand, studies on an electric-field poled PZN single crystal clearly indicate a rhombohedral phase at room temperature.

show abstract

Section: Discussionmentioning

confidence: 99%

Ground state of the relaxor ferroelectricPb(Zn1/3Nb
Xu
¹
,
Zhong
²
,
Bing
³

et al. 2003
Phys. Rev. B
86
9
77
1
View full text Add to dashboard Cite

show abstract

“…Neutron scattering studies have advanced our understanding of PMN-based relaxor ferroelectrics significantly; [18][19][20][21][22][23][24] however to date comparatively few lattice dynamical measurements have been made on PMN-xPT crystals with compositions lying within the MPB. Considering the precipitous drop in the piezoelectric coefficients that occurs when crossing from the Ti-poor to the Ti-rich side of the MPB, such measurements are of obvious importance to efforts to determine the microscopic mechanism responsible for the anomalously high electromechanical response of these materials.…”

Section: ͑Pmn-xpt͒mentioning

confidence: 99%

Dynamic origin of the morphotropic phase boundary: Soft modes and phase instability in0.68Pb(Mg1/3Nb2/3
Cao
¹
,
Stock
²
,
Xu
³

et al. 2008
Phys. Rev. B
26
2
15
0
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We report neutron inelastic scattering and high-resolution x-ray diffraction measurements on single crystal 0.68Pb͑Mg 1/3 Nb 2/3 O 3 ͒-0.32PbTiO 3 ͑PMN-0.32PT͒, a relaxor ferroelectric material that lies within the compositional range of the morphotropic phase boundary ͑MPB͒ where the piezoelectric properties of PMN-xPT compounds are close to maximal. Data were obtained between 100 and 600 K under zero and nonzero electric field applied along the cubic ͓001͔ direction. The lowest-energy, zone-center, transverse optic phonon is strongly damped and softens slowly at high temperature; however, the square of the soft-mode energy begins to increase linearly with temperature as in a conventional ferroelectric, which we term the soft-mode "recovery," upon cooling into the tetragonal phase at T C . Our data show that the soft mode in PMN-0.32PT behaves almost identically to that in pure PMN, exhibiting the same temperature dependence and recovery temperature even though PMN exhibits no well-defined structural transition ͑no T C ͒. The temperature dependence of the soft mode in PMN-0.32PT is also similar to that in PMN-0.60PT; however, in PMN-0.60PT the recovery temperature equals T C . These results suggest that the temperature dependence and the energy scale of the soft-mode dynamics in PMN-xPT are independent of concentration on the Ti-poor side of the MPB, but scale with T C for Ti-rich compositions. Thus the MPB may be defined in lattice dynamical terms as the concentration where T C first matches the recovery temperature of the soft mode. High-resolution x-ray studies show that the cubic-to-ferroelectric phase boundary shifts to higher temperatures by an abnormal amount within the MPB region in the presence of an electric field. This suggests that an unusual instability exists within the apparently cubic phase at the MPB.

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“…Naberezhnov et al performed the first study of the lattice dynamics of PMN single crystal by means of inelastic neutron scattering (INS) 17 . They observed a transverse optic (TO1) phonon branch which softens on cooling to T d ≈ 620 K. Below T d the softening ceased and a strong central peak appeared.…”

Section: Introductionmentioning

confidence: 99%

“…Simultaneously, it was observed that the damping of TA mode remarkably increased below T d . 17 27 Therefore, they claimed that the waterfall effect is not connected with phonon scattering on polar nanoclusters but could be explained as apparent effect in the framework of a model of bilinearly coupled harmonic oscillators representing the acoustic and heavily damped optic phonon branches and the fact that there are different dynamical structure factors in different Brillouin zones.…”

Section: Introductionmentioning

confidence: 99%

Soft and central mode behaviour in PbMg_1/3Nb_2/3O₃relaxor ferroelectric

Kamba¹,

Kempa²,

Bovtun³

et al. 2005

J. Phys.: Condens. Matter

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The relaxor ferroelectric PbMg 1/3 Nb 2/3 O3 was investigated by means of broad-band dielectric and Fourier Transform Infrared (FTIR) transmission spectroscopy in the frequency range from 1 MHz to 15 THz at temperatures between 20 and 900 K using PMN films on infrared transparent sapphire substrates. While thin film relaxors display reduced dielectric permittivity at low frequencies, their high frequency intrinsic or lattice response is shown to be the same as single crystal/ceramic specemins. It was observed that in contrast to the results of inelastic neutron scattering, the optic soft mode was underdamped at all temperatures. On heating, the TO1 soft phonon followed the Cochran law with an extrapolated critical temperature equal to the Burns temperature of 670 K and softened down to 50 cm −1 . Above 450 K the soft mode frequency leveled off and slightly increased above the Burns temperature. A central mode, describing the dynamics of polar nanoclusters appeared below the Burns temperature at frequencies near the optic soft mode and dramatically slowed down below 1 MHz on cooling below room temperature. It broadened on cooling, giving rise to frequency independent losses in microwave and lower frequency range below the freezing temperature of 200 K. In addition, a new heavily damped mode appeared in the FTIR spectra below the soft mode frequency at room temperature and below. The origin of this mode as well as the discrepancy between the soft mode damping in neutron and infrared spectra is discussed.

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Inelastic neutron scattering study of the relaxor ferroelectric PbMg Nb O at high temperatures

Cited by 140 publications

References 2 publications

Ground state of the relaxor ferroelectricPb(Zn1/3Nb
Xu
¹
,
Zhong
²
,
Bing
³

et al. 2003
Phys. Rev. B
86
9
77
1
View full text Add to dashboard Cite

Ground state of the relaxor ferroelectricPb(Zn1/3Nb
Xu
¹
,
Zhong
²
,
Bing
³

et al. 2003
Phys. Rev. B
86
9
77
1
View full text Add to dashboard Cite

Dynamic origin of the morphotropic phase boundary: Soft modes and phase instability in0.68Pb(Mg1/3Nb2/3
Cao
¹
,
Stock
²
,
Xu
³

et al. 2008
Phys. Rev. B
26
2
15
0
View full text Add to dashboard Cite

Soft and central mode behaviour in PbMg_1/3Nb_2/3O₃relaxor ferroelectric

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Inelastic neutron scattering study of the relaxor ferroelectric PbMg Nb O at high temperatures

Cited by 140 publications

References 2 publications

Ground state of the relaxor ferroelectricPb(Zn1/3NbXu1, Zhong2, Bing3 et al. 2003Phys. Rev. B869771View full textAdd to dashboardCite

Ground state of the relaxor ferroelectricPb(Zn1/3NbXu1, Zhong2, Bing3 et al. 2003Phys. Rev. B869771View full textAdd to dashboardCite

Dynamic origin of the morphotropic phase boundary: Soft modes and phase instability in0.68Pb(Mg1/3Nb2/3Cao1, Stock2, Xu3 et al. 2008Phys. Rev. B262150View full textAdd to dashboardCite

Soft and central mode behaviour in PbMg1/3Nb2/3O3relaxor ferroelectric

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About

Ground state of the relaxor ferroelectricPb(Zn1/3Nb
Xu
¹
,
Zhong
²
,
Bing
³

et al. 2003
Phys. Rev. B
86
9
77
1
View full text Add to dashboard Cite

Ground state of the relaxor ferroelectricPb(Zn1/3Nb
Xu
¹
,
Zhong
²
,
Bing
³

et al. 2003
Phys. Rev. B
86
9
77
1
View full text Add to dashboard Cite

Dynamic origin of the morphotropic phase boundary: Soft modes and phase instability in0.68Pb(Mg1/3Nb2/3
Cao
¹
,
Stock
²
,
Xu
³

et al. 2008
Phys. Rev. B
26
2
15
0
View full text Add to dashboard Cite

Soft and central mode behaviour in PbMg_1/3Nb_2/3O₃relaxor ferroelectric