Optical studies of ferroelastic phase transition and domain structures in K3Na(SeO4)2 crystals

Chen, R.H.; Chang, Chi-Ching; Chen, T.M.

doi:10.1016/0022-3697(95)00086-0

Cited by 68 publications

(11 citation statements)

References 9 publications

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“…29 Two peaks near 50 cm −1 in theZ(XY )Z spectra and only one peak near 50 cm −1 in theZ(XX)Z spectra are also observed for PMN, PZN, and PZN-xPT for x = 0.045 and 0.08, but not for x = 0.20. 19 37 The latter structural distortion can be realized also in PbB 0.5 B 0.5 O 3 systems and is in agreement with the proposed rhombohedral-type structure of PNRs. As a result, at high temperatures the vibrations of Pb1 ions should contribute to one peak in theZ(XY )Z spectrum and to none in theZ(XX)Z spectrum; Pb2 ions should contribute to one peak in theZ(XY )Z spectrum and a part of Pb2 ions, which are off-center displaced, should give rise to a peak in thē Z(XX)Z spectrum.…”

Section: Assignment Of the Doublet Observed At High Temperatures Inz(supporting

confidence: 72%

Local structural phenomena in pure and Ru-doped0.9PbZn1/3Nb2/3O3
Waeselmann
¹
,
Mihailova
²
,
Maier
³

et al. 2011
Phys. Rev. B
53
8
50
0
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The development of polar order in perovskite-type (ABO 3 ) solid solutions of relaxors and normal ferroelectrics is studied on the basis of the temperature dependence of polarized Raman spectra of pure and Ru-doped 0.9PbZn 1/3 Nb 2/3 O 3 -0.1PbTiO 3 (PZN-0.1PT) single crystals as well as complementary x-ray diffraction analysis. It is shown that the Raman peaks related to Pb-localized vibrations existing solely in a double-perovskite structure (prototype symmetry F m3m) are highly sensitive to the nucleation and development of polar atomic arrangements. The doublet near 50 cm −1 observed in the high-temperatureZ(XY )Z spectra of PZN-xPT (x = . The singlet in the high-temperatureZ(XY )Z spectra is assigned to off-centered Pb2 ions. The Raman spectra of PZN-0.1PT indicate that off-centered Pb2 ions induce coherent polar shifts of ferroelectrically active B cations, which in turn facilitates the off-centering of Pb1 ions. A low degree of B-site doping with mixed-valence elements like Ru can substantially influence the development of ferroelectric order in PZN-xPT solid solutions due to the different preferred types of local octahedral distortion associated with the different valence states of the doping cations. The incorporation of Ru into the structure of PZN-0.1PT slightly decreases the Burns temperature and shifts the tetragonal-to-monoclinic phase transition to lower temperatures, thus favoring the tetragonal state in a wider temperature range as compared to the undoped compound. An assumption is made that the nanoscale polar order in Pb-based B-site complex perovskite-type relaxors might be of ferrielectric type rather than of ferroelectric type.

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Section: Assignment Of the Doublet Observed At High Temperatures Inz(supporting

confidence: 72%

Local structural phenomena in pure and Ru-doped0.9PbZn1/3Nb2/3O3
Waeselmann
¹
,
Mihailova
²
,
Maier
³

et al. 2011
Phys. Rev. B
53
8
50
0
View full text Add to dashboard Cite

show abstract

“…5 The occupation of the B-site by cations of different atomic radii and valencies can lead to the formation of chemically ordered nano-regions with Fm 3m symmetry. [6][7][8] Therefore, in the paraelectric state the symmetries of the chemically ordered and disordered regions are Fm 3m and Pm 3m, respectively. 9,10 Upon cooling, the correlation between the off-center cations gives rise to the formation of polar nano regions (PNRs).…”

Section: Single Crystal I Introductionmentioning

confidence: 99%

Dielectric and polarized Raman spectroscopic studies on 0.85Pb(Zn1/3Nb2/3)O3-0.15PbTiO3 single crystal

Mishra

Arora

Tripathy

et al. 2012

Journal of Applied Physics

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Tetragonal-cubic phase transition has been investigated in relaxor-ferroelectric 0.85Pb(Zn1/3Nb2/3)O3-0.15PbTiO3 single crystal using dielectric and Raman spectroscopy. A detailed analysis of the dielectric data suggests that the transition is of second order. In the tetragonal phase (P4mm), all the modes predicted by group theory were found in the Raman spectra and were assigned based on the symmetry and polarization configuration. Frequencies of several modes were found to disappear while a few modes exhibited discontinuous change across the phase transition temperature TC ∼473 K. While in the high temperature cubic phase (Pm3¯m) no first order Raman spectrum is expected, the presence of several Raman peaks at elevated temperature suggests substitutional disorder causing the appearance of symmetry-forbidden Raman bands. The line-width of A1(TO) mode at 273 cm−1 shows anomalies across TC and the intermediate temperature T*. Furthermore, based on the temperature dependence of total integrated intensities of all the modes in the polarized and depolarized spectra, the Burns temperature TB, T*, and TC are identified at 650, 525, and 473 K, respectively.

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“…Jerzak and Morz [13] reported electron paramagnetic resonance of SeO 3 -radicals in KNSe single crystal. They suggested first order phase transition at 329 K. Optical studies of ferroelastic phase transition and domain structure was carried out by Chen et al [14]. The ability to switch of the domains under directional external forces was explained by the retilting of SeO 4 -2 tetrahedra from its present orientation in one domain to other equivalent orientations which are associated with 3-fold symmetry along the c-axis of the high temperature phase.…”

Section: Introductionmentioning

confidence: 98%

DC conductivity studies in K₃Na(SeO₄)₂ single crystals

Joseph

Kumar

Iype

et al. 2009

Cryst. Res. Technol.

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DC electrical conductivity studies were carried out along the three crystallographic axes for Tripotassium sodium diselenate (K 3 Na(SeO 4 ) 2 or KNSe). Earlier studies of phase transition in this crystal show successive phase transitions at 334 K, 346 K, 730 K, and 758 K. In this paper we report the dc electrical conductivity measurements in the temperature region 303 K -430 K along a, b and c -axes. An anomaly in conductivity was obtained around 341 K and another one around 333 K. These can be attributed as due to phase transitions in this crystal. A strong anomaly also has been observed along the c-axis and comparatively week one along a and b axes around 395 K for the first time. This can be due to newly observed phase transition in the crystal. DSC taken for the sample also shows endothermic peak supporting the occurrence of newly observed phase transition.

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Optical studies of ferroelastic phase transition and domain structures in K3Na(SeO4)2 crystals

Cited by 68 publications

References 9 publications

Local structural phenomena in pure and Ru-doped0.9PbZn1/3Nb2/3O3
Waeselmann
¹
,
Mihailova
²
,
Maier
³

et al. 2011
Phys. Rev. B
53
8
50
0
View full text Add to dashboard Cite

Local structural phenomena in pure and Ru-doped0.9PbZn1/3Nb2/3O3
Waeselmann
¹
,
Mihailova
²
,
Maier
³

et al. 2011
Phys. Rev. B
53
8
50
0
View full text Add to dashboard Cite

Dielectric and polarized Raman spectroscopic studies on 0.85Pb(Zn1/3Nb2/3)O3-0.15PbTiO3 single crystal

DC conductivity studies in K₃Na(SeO₄)₂ single crystals

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Optical studies of ferroelastic phase transition and domain structures in K3Na(SeO4)2 crystals

Cited by 68 publications

References 9 publications

Local structural phenomena in pure and Ru-doped0.9PbZn1/3Nb2/3O3Waeselmann1, Mihailova2, Maier3 et al. 2011Phys. Rev. B538500View full textAdd to dashboardCite

Local structural phenomena in pure and Ru-doped0.9PbZn1/3Nb2/3O3Waeselmann1, Mihailova2, Maier3 et al. 2011Phys. Rev. B538500View full textAdd to dashboardCite

Dielectric and polarized Raman spectroscopic studies on 0.85Pb(Zn1/3Nb2/3)O3-0.15PbTiO3 single crystal

DC conductivity studies in K3Na(SeO4)2 single crystals

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About

Local structural phenomena in pure and Ru-doped0.9PbZn1/3Nb2/3O3
Waeselmann
¹
,
Mihailova
²
,
Maier
³

et al. 2011
Phys. Rev. B
53
8
50
0
View full text Add to dashboard Cite

Local structural phenomena in pure and Ru-doped0.9PbZn1/3Nb2/3O3
Waeselmann
¹
,
Mihailova
²
,
Maier
³

et al. 2011
Phys. Rev. B
53
8
50
0
View full text Add to dashboard Cite

DC conductivity studies in K₃Na(SeO₄)₂ single crystals