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Kenji Ohwada,Tatsuo Fukuda,Jun’ichiro Mizuki,Kazuma Hirota,Hikaru Terauchi,Satoshi Tsutsui,Alfred Q. R. Baron,Hidehiro Ohwa,Naohiko Yasuda 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.31
Pb(In_(1/2)Nb_(1/2))O_3 (PIN) can be antiferroelectric (AFE), ferroelectric (FE) or a relaxor depending upon the perovskite B-site randomness. In order to clarify the effect of B-site randomness, we studied the dynamics of ordered PIN without B-site randomness (O-PIN, AFE), which will give us a clear picture of the AFE/relaxor nature of the ground state due to B-site randomness. The quasielastic (QE) scattering shows a critical slowing down near the Γ-point and the transverse acoustic (TA) mode shows a softening trend at a finite wavenumber position (not at the Γ-point) towards the AFE phase transition temperature (T_N ∼ 450 K). On the other hand, the transverse optic (TO) mode shows a softening near the Γ-point toward low temperature with no clear anomaly at T_N. These results indicate that the AFE phase transition is associated with the TA mode and the origin of the QE scattering while a ferroelectric correlation exists behind the AFE ordering. The effect of B-site randomness is finally discussed on the basis of the results.
Laser-induced crystalline phase transition from rutile to anatase of niobium doped TiO2
Edvins Dauksta,Arturs Medvids,Pavels Onufrijevs,Masaru Shimomura,Yasuo Fukuda,Kenji Murakami 한국물리학회 2019 Current Applied Physics Vol.19 No.3
The investigation of the laser-induced crystalline phase transition of niobium doped TiO2 single crystal is discussed in this paper. The TiO2 single crystal was studied by using Raman spectroscopy and electron backscatter diffraction before and after irradiation by 266 nm ns laser at the threshold intensity of 56 MW/cm2. Experimental results show an evidence of anatase phase formation from rutile single crystal. Moreover, the analysis of the experimentally obtained and calculated crystallographic texture indicates that the converted TiO2 layer has a polycrystalline structure with the preferred orientations. According to the Raman spectroscopy the amount of anatase phase increases with the number of laser pulses indicating the dose-dependent conversion process.