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Journal of Advanced Dielectrics 2011年第2期1卷 185-190页

作者： J.D.S.GUeRRA C.R.HATHeNHeR grupo de ferroeletricos e materiais multifuncionais Instituto de Fisica Universidade Federal de Uberlandia 38400-902UberlandiaMGBrazil

The physical properties of the new TeO_(2)-B_(2)O_(3)-PbO_(2)(TBP)-based glass system,obtained from the usual melt-quench method,have been investigated taking into account the infuence of the Pb(Zr_(y)Ti_(1-y))O_(3)(PZT)ferroelectric system.A crystalline-like structure,which characterizes a glass-ceramic-like state,promoted by the ferroelectric phase,has been revealed from the X-ray diffraction results for the sample with higher PZT *** the other hand,results on the dielectric response revealed noticeable dielectric anomalies,which until now have not been *** fact,the dielectric and ferroelectric properties suggest the existence of a structural phase transition induced by the PZT crystalline phase,which indeed have been related to the ferroelectric polar-phase regions embedded into the glass matrix.

关键词： Tellurite glasses ferroelectrics glass-ceramics dielectric properties

debye's temperature and heat capacity for Sr_(0.15)Ba_(0.85)Bi_(2)Nb_(2)O_(9) relaxor ferroelectric ceramic

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Journal of Advanced Dielectrics 2016年第1期6卷 1-4页

作者： A.Pelaiz-Barranco Y.Gonzalez-Abreu P.Saint-Gregoire J.D.S.Guerra F.Calderón-Piñar Facultad de Fisica-IMRe Universidad de La Habana San Lazaro y LVedadoLaHabana 10400Cuba department of Sciences and Arts University of Nîmes 30021 Nîmes Cedex 01France grupo de ferroeletricos e materiais multifuncionais Instituto de Fisica Universidade Federal de Uberlandia.38400-902Uberlandia-MGBrazil

A lead-free relaxor ferroelectric,Sr_(0.15)Ba_(0.85)Bi_(2)Nb_(2)O_(9),was synthesized via solid-state reaction and the temperature-dependence of the heat capacity was measured in a wide temperature *** dielectric permittivity was also measured between 500 Hz and 5 MHz in the same temperature *** anomaly has been detected in the heat capacity curve for the whole temperature range covered in the present experiments,while broad peaks have been observed in the dielectric permittivity with high frequency dispersion.A typical relaxor behavior has been observed from the dielectric *** debye's temperature has showed a minimum value near the freezing *** results are discussed considering the spin-glass model and the high frequency dispersion,which has been observed for the studied relaxor system.

关键词： Relaxors ferroelectrics heat capacity ceramics

Relaxor ferroelectric behavior:An approach considering both the dipolar and electrical conductivity contributions

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Journal of Advanced Dielectrics 2021年第3期11卷 51-55页

作者： C.Carreras-Casas O.García-Zaldívar A.Peláiz-Barranco Y.González-Abreu F.Calderón-Pinar J.D.S.Guerra grupo de Materiales Ferroicos Facultad de Física-Instituto de Ciencia y Tecnología de Materiales Universidad de La Habana La Habana 10400Cuba grupo de Ferroelétricos e materiais multifuncionais Instituto de Física Universidade Federal de Uberlandia UberlandiaMinas Gerais38408-100Brazil

The relaxor behavior of PLZT ferroelectric ceramics has been analyzed in a wide frequency and temperature ranges,below and above the temperature for the formation of the so-called polar nano-regions(PNRs).An approximation to the dynamical behavior of the PNRs has been discussed using Cole-Cole’s relaxation model and Jonscher’s Universal Relaxation *** analysis considers both the dipolar contribution and those ones associated with DC and AC electric conductivities,this latter not being previously reported in the literature for relaxor *** effectiveness of the developed model has been verified from the agreement between the experimental data and the theoretical *** study also offers an indirect method to predict the DC component of the electrical conductivity.

关键词： Relaxor ferroelectrics dielectric response modeling conductivity Cole-Cole

Structural,microstructural and dielectric characterizations of(Bi_(0.5)Na_(0.5))TiO_(3) based lead-free ferroelectric ceramics

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Journal of Advanced Dielectrics 2021年第3期11卷 39-44页

作者： B.R.Moya A.C.Silva A.Peláiz-Barranco J.D.S.Guerra grupo de Ferroelétricos e materiais multifuncionais Instituto de Física Universidade Federal de Uberlandia UberlandiaMinas Gerais 38408-100Brazil departamento de Física e Química UNESP Campus de Ilha SolteiraSao Paulo 15385-000Brazil grupo de Materiales Ferroicos Facultad de Física-Instituto de Ciencia y Tecnología de Materiales Universidad de La Habana La Habana 10400Cuba

(1-x)(Bi_(0.5)Na_(0.5))TiO_(3)-xBaTiO_(3) lead-free ceramics have been obtained from the conventional solid-state reaction sintering *** structural properties were investigated from X-ray diffraction and Raman spectroscopy *** revealed well-crystallized ceramic samples with perovskite *** properties,obtained from scanning electron microscopy measurements,have shown high density with very low porosity *** dielectric response,analyzed as a function of the temperature and several frequencies,showed very broad peaks with a strong frequency dependence of the temperature for the maximum dielectric permittivity for the modified *** were analyzed considering the influence of the BaTiO3 content on the studied physical properties.

关键词： Lead-free BNT Raman spectroscopy dielectric response

exploring the electromechanical response and electric field-induced dielectric anomalies in PMN-PT electroceramics

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Journal of Advanced Dielectrics 2021年第3期11卷 32-38页

作者： J.D.S.Guerra C.A.Guarany e.C.Lima e.B.Araújo J.e.Garcia grupo de Ferroelétricos e materiais multifuncionais Instituto de Física Universidade Federal de Uberlandia UberlandiaMinas Gerais 38408-100Brazil Universidade Federal do Tocantins Porto Nacional Tocantins 77500-000Brazil departamento de Física e Química Universidade Estadual Paulista Ilha Solteira–Sao Paulo 15385-000Brazil department of Physics Universitat Politècnica de Catalunya–BarcelonaTech Barcelona 08034Spain

electromechanical and dielectric properties of PMN-PT ferroelectric ceramics are *** particular,dielectric response studies focus on the investigation of the influence of the DC applied electric field on the dielectric permittivity as a function of temperature and *** reveal an electric field driven dielectric anomaly in the dielectric permittivity curves,e(e),which in turn prevails in the whole ferroelectric phase region and continuously vanishes for temperatures near the paraelectric-ferroelectric phase transition temperature.A schematic model for the domains dynamics of the studied material is proposed taking into account the simultaneous contribution of both 90°and 180°domains walls.

关键词： Ferroelectrics PMN-PT domain-walls dielectric response electric field

Switching and energy-storage characteristics in PLZT 2/95/5 antiferroelectric ceramic system

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Journal of Advanced Dielectrics 2016年第4期6卷 1-4页

作者： A.Pelaiz-Barranco Y.Mendez-Gonzalez J.D.S.Guerra Xiucai Wang Tongqing Yang Facultad de Fisica-IMRe Universidad de La Habana San Lazaroy LVedadoLa Habana 10400Cuba grupo de Ferroeletricos e materiais multifuncionais Instituto de Fsica Universidade Federal de Uberlandia38408-100Uberlandia-MGBrazil Functional Materials Research Laboratory College for Materials Science and EngineeringTongji University4800 CaoanShanghai 201804P.R.China

Switching mechanisms and energy-storage properties have been investigated in(Pb_(0.98)La_(0.02)T(Zr_(0.95)Ti_(0.05)T_(0.995O_(3)) antiferroelectric *** electric field dependence of polarization(P–e hysteresis loops)indicates that both the ferroelectric(Fe)and antiferroelectric(AFe)phases coexist,being the AFe more stable above 100℃.It has been observed that the temperature has an important influence on the switching *** the other hand,the energy-storage density,which has been calculated from the P–e hysteresis loops,shows values higher than 1 J/cm^(3) for temperatures above 100℃ with around 73%of efficiency as *** properties indicate that the studied ceramic system reveals as a promising AFe material for energy-storage devices application.

关键词： Antiferroelectrics energy-storage switching.