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2021
Volume: 11 Issue 3
8 Article(s)
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Research Articles
Synthesis and evaluation of nickel cobalt ferrite magnetic ceramics employing two alternative routes
Javier E. Camargo, Leandro A. Ramajo, and Miriam S. Castro
Ni0.5Co0.5Fe2O4 (NCF) powders were obtained employing two alternative synthesis routes: solid-state reaction and Pechini’s methods. The ceramic powders were pressed and sintered in the temperature range of 1100∘C to 1250∘C. Microstructural and structural properties were evaluated by SEM, XRD, and Raman spectroscopy. Ma
Journal of Advanced Dielectrics
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 3, 2140001 (2021)
Influence of the sintering temperature on ferroelectric properties of potassium-sodium niobate piezoelectric ceramics
J. A. Cortés, J. Camargo, M. F. Rachia, F. Rubio-Marcos, L. Ramajo, M. Castro, and M. A. Ramírez
The effect of sintering condition on structure, microstructure, and ferroelectric properties of (K0.44Na0.52Li0.04) (Nb0.86Ta0.10Sb0.04)- O3 (KNL–NTS) has been investigated. Ceramic powders have been synthesized by the solid-state reaction method and sintered at different temperatures (1115∘C, 1125∘C, and 1140∘C). ThenThe effect of sintering condition on structure, microstructure, and ferroelectric properties of (
Journal of Advanced Dielectrics
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 3, 2140002 (2021)
Electric, magnetic and microstructural features of the CoFeO
J. A. Jaramillo Palacio, K. A. Muñoz Pulido, J. Arbey Rodríguez, D. A. Landínez Téllez, and J. Roa-Rojas
In the search for new materials with applicable magnetic properties in spintronic devices, the aim of this work is to report the synthesis of the lanthanide ferrocobaltite La2CoFeO6 using the modified Pechini route; the experimental study of structural, morphological and magnetic properties, and the analysis of the eleIn the search for new materials with applicable magnetic properties in spintronic devices, the aim of this work is to report the synthesis of the lanthanide ferrocobaltite La2CoFeO6 using the modified Pechini route; the experimental study of structural, morphological and magnetic properties, and the analysis of the electronic structure and bands are obtained in the framework of the Density Functional Theory. Rietveld refinement of experimental X-ray diffraction patterns revealed the crystallization of this oxide material in a perovskite-like monoclinic structure, space group
Journal of Advanced Dielectrics
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 3, 2140003 (2021)
Influence of CuO addition on dielectric and piezoelectric properties of (Na
M. Difeo, L. Ramajo, and M. Castro
Doping effects of CuO on the sintering behavior and electrical properties of 0.94(Bi0.5Na0.5)TiO3–0.06(BaTiO3)–xCuO (BNT–BT6–xCu) lead-free piezoceramic obtained by the conventional solid-state reaction method were investigated. Regarding the undoped system, it is already known that it presents the best densification vDoping effects of CuO on the sintering behavior and electrical properties of 0.94(
Journal of Advanced Dielectrics
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 3, 2140004 (2021)
Exploring the electromechanical response and electric field-induced dielectric anomalies in PMN–PT electroceramics
J. D. S. Guerra, C. A. Guarany, E. C. Lima, E. B. Araújo, and J. E. Garcia
Electromechanical and dielectric properties of PMN–PT ferroelectric ceramics are investigated. In 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 frequency. Results reveal an electric fieElectromechanical and dielectric properties of PMN–PT ferroelectric ceramics are investigated. In 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 frequency. Results reveal an electric field driven dielectric anomaly in the dielectric permittivity curves,
Journal of Advanced Dielectrics
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 3, 2140005 (2021)
Structural, microstructural and dielectric characterizations of (
B. R. Moya, A. C. Silva, A. Peláiz-Barranco, and J. D. S. Guerra
(1–x)Bi0.5Na0.5TiO3–xBaTiO3lead-free ceramics have been obtained from the conventional solid-state reaction sintering method. The structural properties were investigated from X-ray diffraction and Raman spectroscopy techniques. Results revealed well-crystallized ceramic samples with perovskite structure. Microstructura(1–
Journal of Advanced Dielectrics
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 3, 2140006 (2021)
Effects of crystallization kinetics on the dielectric and electrical properties of
Y. González-Abreu, S. P. Reis, F. E. Freitas, J. A. Eiras, and E. B. Araújo
BiFeO3 thin films were prepared using the chemical solution route on Pt/TiO2/SiO2/Si(100) substrates under different crystallization kinetics. The crystallization kinetic effects on the dielectric and electrical properties have been investigated. These properties included dielectric permittivity, electric modulus, elecBiFeO3 thin films were prepared using the chemical solution route on Pt/TiO2/SiO2/Si(100) substrates under different crystallization kinetics. The crystallization kinetic effects on the dielectric and electrical properties have been investigated. These properties included dielectric permittivity, electric modulus, electrical conductivity measurements as a function of the temperature (300–525 K) and frequency (102–106 Hz), and leakage current measurements electric field range ± 30 kV/cm at room temperature. The differences observed in conductivity and current density of the BiFeO3 films were discussed in terms of possible defects induced by the crystallization kinetic. An anomalous relaxor-like dielectric behavior characterized by a broad maximum in the real dielectric permittivity as a function of temperature and the low-frequency dielectric dispersion has been observed. The nonexpected peaks in the real permittivity were accompanied by increasing at least four orders in the conductivity’s magnitude at high temperatures. The origin of the relaxor-like dielectric anomalies is discussed, suggesting that the dielectric permittivity peaks are artifacts due to carrier migration correlated to the onset of the Maxwell–Wagner effect.BiFeO3 thin films were prepared using the chemical solution route on Pt/TiO2/SiO2/Si(100) substrates under different crystallization kinetics. The crystallization kinetic effects on the dielectric and electrical properties have been investigated. These properties included dielectric permittivity, electric modulus, electrical conductivity measurements as a function of the temperature (300–525 K) and frequency (102–106 Hz), and leakage current measurements electric field range ± 30 kV/cm at room temperature. The differences observed in conductivity and current density of the BiFeO3 films were discussed in terms of possible defects induced by the crystallization kinetic. An anomalous relaxor-like dielectric behavior characterized by a broad maximum in the real dielectric permittivity as a function of temperature and the low-frequency dielectric dispersion has been observed. The nonexpected peaks in the real permittivity were accompanied by increasing at least four orders in the conductivity’s magnitude at high temperatures. The origin of the relaxor-like dielectric anomalies is discussed, suggesting that the dielectric permittivity peaks are artifacts due to carrier migration correlated to the onset of the Maxwell–Wagner effect..
Journal of Advanced Dielectrics
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 3, 2140007 (2021)
Relaxor ferroelectric behavior: An approach considering both the dipolar and electrical conductivity contributions
C. Carreras-Casas, O. García-Zaldívar, A. Peláiz-Barranco, Y. González-Abreu, F. Calderón-Piñar, and J. D. S. Guerra
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 andThe 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 Law. The 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 materials. The effectiveness of the developed model has been verified from the agreement between the experimental data and the theoretical calculations. This study also offers an indirect method to predict the DC component of the electrical conductivity.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 Law. The 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 materials. The effectiveness of the developed model has been verified from the agreement between the experimental data and the theoretical calculations. This study also offers an indirect method to predict the DC component of the electrical conductivity..
Journal of Advanced Dielectrics
- Publication Date: Jan. 01, 1900
- Vol. 11, Issue 3, 2140008 (2021)
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