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ferroelectric relaxor as a critical state

中国科学:技术科学 2010年第4期 446-446页

作者： WANG ChunLei,LI JiChao,ZHAO MingLei,LIU Jian & ZHANG JiaLiang School of Physics and State Key Laboratory of Crystal Materials,Shandong University,Jinan 250100,China

After revisiting models for the ferroelectric relaxors,we notice that the models can be classified into two *** group models are directly based upon the compositional fluctuations,such as Smolenskii’s theory and SRBRF *** other models are experimental phenomenon oriented,such as macro-micro domain crossover and superparaelectric state. The later explanations imply that the ferroelectric relaxor is in a critical *** unusual field induced phase transition in ferroelectric relaxor also suggests that this is a critical phenomenon with first order phase transition *** within the framework of effective field approach and with introducing the concept of quantum temperature scale,we reproduce the diffused phase transition of the dielectric constant and the field induced phase *** seems that the larger quantum fluctuation at low temperature depresses the ferroelectricity in ferroelectric relaxors,and results in their unusual physical properties.

关键词： ferroelectric relaxor critical state quantum temperature scale

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Elastic,dielectric,and piezoelectric characterization of 0.92Pb(Zn_(1/3) Nb_(2/3))O_3-0.08PbTiO_3 single crystal by Brillouin scattering

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Chinese Physics B 2015年第2期24卷 432-435页

作者：方绍熙汤冬云陈昭明张华刘玉龙 Key Laboratory of Multi-scale Manufacturing Technology Chongqing Institute of Green and Intelligent TechnologyChinese Academy of Sciences

In this paper,a complete set of elastic,piezoelectric,and dielectric constants of high-quality tetragonal poled0.92Pb（Zn1/3Nb2/3）O3-0.08PbTiO3 single crystal grown by the modified flux method is determined using high-resolution Brillouin scattering.A comparison is made between the results obtained by a hybrid method combining ultrasonic and resonant techniques and the results obtained by the Brillouin *** elastic,piezoelectric,and dielectric constants obtained by the two methods are *** Brillouin spectrum consists of one longitudinal and two transverse acoustic phonon modes,and the variations of the Brillouin shifts,the full widths at half maximum,and the scattering intensities of these modes with scattering angle 9 are *** particular,the transverse acoustic phonon mode at the lowfrequency becomes markedly soft from 28.2 GHz to 18.4 GHz and broadens gradually with the increase of θ,while its intensity decreases gradually as compared with that of the original *** possible origins of the results are discussed.

关键词： ferroelectric relaxor high-resolution Brillouin scattering acoustic phonons

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