Showing papers by "Pham Thanh Phong published in 2022"
TL;DR: The magnetic and electrical properties of the substituted La0.7Sr0.3Mn1-xCoxO3 perovskite (0 ≤ x ≤ 1) were studied in this paper .
6 citations
3 citations
2 citations
TL;DR: In this article , the structure, optical and electrical conductivity properties of BaTi1−xCoxO3 (0≤ x ≤ 0.1) ceramics prepared by the hydrothermal method were investigated.
Abstract: This work investigates the structure, optical and electrical conductivity properties of BaTi1−xCoxO3 (0≤ x ≤0.1) ceramics prepared by the hydrothermal method. The X-ray diffraction and Raman scattering analysis demonstrates that the prepared samples have a single-phase tetragonal structure with P4mm symmetry. The UV-vis diffuse reflectance spectrum confirms the influence of Co concentration on the direct optical band gap of BaTi1−xCoxO3 ceramics. The optical band gap shifts from 3.14 eV to 3.44 eV as the Co concentration increases from 0 to 0.1. The dielectric constant increases with the depletion of frequency according to the Maxwell–Wagner and Koops model. The AC conductivity versus frequency curve indicates that the conduction mechanism is determined by using the correlated barrier hopping (CBH) model. The Cole–Cole plot of the complex impedance was investigated for the prepared samples. The compounds showed dielectric relaxation of the non-Debye type.
2 citations
TL;DR: In this paper , the authors proposed a method to solve the problem of homonymity in homonym identification, i.e., homonymization, in the context of homology.
Abstract: ABSTRACT
TL;DR: In this article , the authors discuss the magnetic properties and the SAR of core-shell CoFe2O4/Fe3O4 nanoparticles (CS CF/FO NPs).
Abstract: Received: 09/3/2022 The conversion of electromagnetic energy into heat by nanoparticles (magnetic inductive heating) has potential for biomedicine applications such as drug release, hyperthermia, but low heating efficiency (SAR) has limited applications. Core-shell nanoparticles consisting of two soft-hard magnetic phases are of interest because the magnetic properties can be controlled to achieve optimal SAR. However, the relationship between structure, magnetic properties and the SAR is difficult to predict. The aim of this study is to discuss the magnetic properties and the SAR of core-shell CoFe2O4/Fe3O4 nanoparticles (CS CF/FO NPs). Saturation magnetization increases and coercivity of decreases as the volume or mass of the FO phase in CS CF/FO NPs increases as well as a better hard-soft magnetic exchange coupling. High SAR values are obtained when the particle sizes or magnetic parameters have optimal values as well as the exchange coupling beetwen the magnetic phases increases. In addition, the relaxation loss is the main mechanism contributing to the SAR in this experiment. The CS CF/FO NPs with superparamagnetic core particle size are potential candidates for magnetic hyperthermia. Revised: 28/4/2022