Phonon anomalies in Pb1-xLax(Zr0.9Ti0.1)O3 ceramics

Buixaderas, E.; Gregora, I.; Kamba, S.; Kuzˇel, P.; Reaney, I.
February 2009
Applied Physics Letters;2/2/2009, Vol. 94 Issue 5, pN.PAG
Academic Journal
The lattice dynamics of Pb1-xLax(Zr0.9Ti0.1)O3 (PLZT X/90/10) with X=0, 2, 4, 10% of La was studied by means of Far Infrared, Raman and terahertz spectroscopies in the temperature range of 20–800 K. Infrared active soft phonons with anomalies near the paraelectric-ferroelectric phase transition were found for all the samples. Some Raman active phonons show anomalies ∼200 K below TC, due to another phase transition to a ferroelectric state with doubled unit cell. Samples with higher La content (X=4,10) display nonclassical phonon softening described by ω2=a(T-TC)γ with γ=2/3.


Related Articles

  • Low-frequency Raman scattering study of the ferroelectric phase transition in the DKDP crystal. Malinovsky, V. K.; Pugachev, A. M.; Surovtsev, N. V. // Physics of the Solid State;Jun2008, Vol. 50 Issue 6, p1137 

    The low-frequency Raman scattering spectra of the DKDP ferroelectric crystal are studied in the temperature range 30–393 K. At temperatures above 150 K, the Raman spectra exhibit a central peak which reflects the lattice relaxation susceptibility. The width and integrated intensity of the...

  • Forcibly driven coherent soft phonons in GeTe with intense THz-rate pump fields. Hase, Muneaki; Kitajima, Masahiro; Nakashima, Shin-ichi; Mizoguchi, Kohji // Applied Physics Letters;12/15/2003, Vol. 83 Issue 24, p4921 

    We propose an experimental technique to generate large amplitude coherent phonons with irradiation of THz-rate pump pulses and to study the dynamics of phase transition in GeTe ferroelectrics. When a single pump pulse irradiates the sample at various pump power densities, the frequency of the...

  • Lattice Dynamics and Hydrostatic-Pressure-Induced Phase Transitions in ScF[sub 3]. Aleksandrov, K. S.; Voronov, V. N.; Vtyurin, A. N.; Goryainov, S. V.; Zamkova, N. G.; Zinenko, V. I.; Krylov, A. S. // Journal of Experimental & Theoretical Physics;May2002, Vol. 94 Issue 5, p977 

    New phase transitions induced by hydrostatic pressure in a cubic (under standard conditions) ScF[sub 3] crystal are discovered by the methods of polarization microscopy and Raman scattering. The space groups R&3macr;; c for Z = 2 and Pnma for Z = 4 are proposed for the high-pressure phases. A...

  • Ferroelectric phase transition in polycrystalline KTaO3 thin film revealed by terahertz spectroscopy. Skoromets, V.; Glinsˇek, S.; Bovtun, V.; Kempa, M.; Petzelt, J.; Kamba, S.; Malicˇ, B.; Kosec, M.; Kuzˇel, P. // Applied Physics Letters;8/1/2011, Vol. 99 Issue 5, p052908 

    KTaO3 single crystal is an archetypal incipient ferroelectric in which a long-range ferroelectric order does not establish at low temperatures owing to quantum fluctuations. We report on a strong evidence of the ferroelectric phase transition near 60 K revealed by terahertz spectroscopy and...

  • Soft-phonon mode observation in Li2Ge4O9 phase above room temperature. Takahashi, Yoshihiro; Kunitomo, Jun; Nakamura, Kensaku; Osada, Minoru; Fujiwara, Takumi // Applied Physics Letters;2/27/2012, Vol. 100 Issue 9, p091902 

    Li2Ge4O9 is known to be a ferroelectric phase with Curie temperature at Tc ∼ -93 °C. In this study, we found both the lowest-frequency phonon and heat-capacity anomalies around 100 °C in the Li2Ge4O9 phase, demonstrating their presence in the structural phase-transition. The phase...

  • Anomalous behavior of acoustic phonon mode and central peak in Pb(Zn1/3Nb2/3)0.85Ti0.15O3 single crystal studied using Brillouin scattering. Mishra, K. K.; Sivasubramanian, V.; Arora, A. K.; Pradhan, Dillip // Journal of Applied Physics;Dec2012, Vol. 112 Issue 11, p114109 

    Brillouin spectroscopic measurements have been carried out on relaxor ferroelectric Pb(Zn1/3Nb2/3)0.85Ti0.15O3 single crystal over the temperature range 300-873 K. The frequency of longitudinal acoustic phonon (LA) begins to exhibit a strong decrease below the Burn's temperature TB followed by...

  • Acoustic properties of the disordered relaxor ferroelectric PbSc1/2Ta1/2O3. Fedoseev, A.; Lushnikov, S.; Gvasaliya, S.; Kojima, S. // Physics of the Solid State;Jun2006, Vol. 48 Issue 6, p1102 

    The behavior of acoustic phonons in crystals of a relaxor ferroelectric, namely, the lead scandium tantalate PbSc1/2Ta1/2O3 (PST), is studied in the vicinity of the diffuse phase transition. The behavior of longitudinal and transverse acoustic phonons in a PST single crystal is examined using...

  • Softening and mode crossing of the lowest-frequency A[sub 1](transverse-optical) phonon in single-crystal PbTiO[sub 3]. Cho, Seong M.; cho, Seong M.; Jang, Hyun M. // Applied Physics Letters;5/22/2000, Vol. 76 Issue 21 

    The polarized Raman spectra of high-quality single-crystal PbTiO[sub 3] were measured in the temperature range between 300 and 700 K. The soft-mode behavior of the A[sub 1](1TO) (transverse- optical) phonon was observed directly. Above 400 K, however, an intensity transfer between the subpeaks...

  • Crystallization of tungstenbronze-type Ba2NaNb5O15 in high-Nb2O5-content glass: An inelastic light scattering study. Takahashi, Yoshihiro; Fujie, Nobuhiro; Osada, Minoru; Masai, Hirokazu; Ihara, Rie; Fujiwara, Takumi // Journal of Applied Physics;Nov2010, Vol. 108 Issue 10, p103519 

    In situ observations of phonon Raman and Boson scattering were performed in high-Nb2O5-content barium-sodium aluminophosphate glass, which crystallizes tungstenbronze-type Ba2NaNb5O15 (BNN), during heating and subsequent cooling processes in order to examine the BNN crystallization dynamics and...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics