Structure, Dielectric Properties and Impedance Spectroscopy of BaTi0.97(Zn,V,Ta)0.03O3 Ceramics

2020 ◽  
Vol 42 (2) ◽  
pp. 228-228
Author(s):  
Raz Muhammad Raz Muhammad ◽  
Sajid Ali Sajid Ali ◽  
Yaseen Iqbal Yaseen Iqbal ◽  
Amir Khesro and Muhammad Uzair Amir Khesro and Muhammad Uzair
Keyword(s):  
Raman Spectroscopy ◽  
Energy Storage ◽  
Dielectric Properties ◽  
Impedance Spectroscopy ◽  
Hysteresis Loops ◽  
Rietveld Analysis ◽  
Tetragonal Symmetry ◽  
X Ray Diffraction ◽  
Spectroscopy Analysis ◽  
Base Materials

BaTi0.97Zn0.01V0.01Ta0.01O3and#172; sample was prepared using the conventional mixed oxide sintering route. The samples were characterized using X-ray diffraction, Raman spectroscopy, Scanning Electron Microscopy and Impedance spectroscopy. Structure of the sample was analyzed using Rietveld analysis which showed the formation of tetragonal symmetry. Raman spectroscopy was also in agreement with the XRD results, further indicating the ferroelectric signature in the sample. Electrical microstructure analyzed by impedance spectroscopy analysis revealed two electroactive regions in the sample, belonging to the grain boundary and bulk. An extrinsic conduction mechanism was observed across the sample. Dielectric properties as a function of temperature demonstrated phase transition (TC) at ~ 94 and#176;C, with relative permittivity ~ 3280 at TC. Antiferroelectric-like double hysteresis loops were observed in P-E analysis. The energy storage density was calculated to be 0.26 J/cm3 at an electric field of 50 kV/cm, indicating that BaTi0.97Zn0.01V0.01Ta0.01O3and#172; ceramics can be potentially useful base materials for high density energy storage capacitors.

Dielectric Properties and Raman Spectroscopy in Ca-Substituted Na0.5Bi0.5TiO3 Ferroelectric Ceramics

2011 ◽  
Vol 324 ◽  
pp. 298-301 ◽  
Author(s):  
Roy Jean Roukos ◽  
Olivier Bidault ◽  
Julien Pansiot ◽  
Ludivine Minier ◽  
Lucien Saviot
Keyword(s):  
Raman Spectroscopy ◽  
Dielectric Properties ◽  
Room Temperature ◽  
Rhombohedral Phase ◽  
Xrd Analysis ◽  
Solid State Reaction Method ◽  
Ferroelectric Ceramics ◽  
Dielectric Measurements ◽  
X Ray Diffraction ◽  
X Ray

Lead free Na0.5Bi0.5TiO3 (NBT) and (Na0.5Bi0.5TiO3)1-x(CaTiO3)x (NBT-CT) piezoelectric ceramics with the perovskite structure were studied. The NBT and NBT-CT samples were synthesized using a solid-state reaction method and characterized with X-ray diffraction (XRD), Raman spectroscopy and dielectric measurements for several compositions (x = 0, 0.07, 0.15) at room temperature. The XRD analysis showed a stabilization of a rhombohedral phase at a low concentration of Ca (0 < x <0.15), whereas Raman spectra reveal a strong modification for the sample with x = 0.15. The dielectric properties of these ceramics were studied by measuring impedance in the 79-451K temperature range for unpoled and field cooling with an electric field (FC) conditions.

scholarly journals PREPARATION AND PHYSICAL PROPERTIES OF OPAL MATRICES WITH NANOPARTICLES OF TITANIUM AND IRON OXIDES

2016 ◽  
Vol 11 (6) ◽  
pp. 91-97
Author(s):  
M. I. Samoylovich ◽  
А. F. Belyanin ◽  
A. S. Bagdasaryan
Keyword(s):  
Electron Microscopy ◽  
Raman Spectroscopy ◽  
Hysteresis Loops ◽  
X Ray Diffraction ◽  
Iron Compounds ◽  
Dielectric Characteristics ◽  
X Ray ◽  
Composition And Structure ◽  
Synthesized Materials ◽  
Frequency Dependences

The article considers specific features of the formation of nanocomposites based on the lattice packing of SiO2 nanospheres (opal matrices) with clusters of titanium and iron compounds (FeTiO3, FeTi2O5, TiO2, Fe2O3) embedded into nanopores between spheres. For the formation of the nanocomposites samples of opal matrices with the sizes of single-domain regions > 0.1 mm3 were used. The diameter of the SiO2 nanospheres was ~260 nm. Nanocomposites with the volume > 1 cm3 and 10-15% of interspherical nanospacing filled by crystallites of titanium and iron compounds were obtained. The composition and structure of the nanocomposites were studied by electron microscopy, X-ray diffraction and Raman spectroscopy. The dependence of the composition of the synthesized materials on the conditions of their preparation is shown. Results of measurements of the frequency dependences (within the range 1 MHz - 3 GHz) of the magnetic and dielectric characteristics of the obtained nanostructures are presented. Hysteresis loops were studied for the obtained samples.

scholarly journals Effect of 6 MeV electron Irradiation on Nano-Cu 2 ZnSnS 4

2021 ◽  
Author(s):  
Sneha Pravin Kandare ◽  
V. N. Bhoraskar ◽  
A. B . Phatangare ◽  
Rekha Rao ◽  
Mala Rao ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Electron Irradiation ◽  
Nano Particles ◽  
Morphological Properties ◽  
X Ray Diffraction ◽  
Spectroscopy Analysis ◽  
Sem Images ◽  
X Ray ◽  
Pristine Sample ◽  
Peak Broadening

Abstract Microwave synthesized nano sized Cu2ZnSnS4 (CZTS) powder was irradiated with 6 MeV electrons, to investigate stability under radiation. The structural, optical, vibrational and morphological properties were explored using X-ray diffraction, UV-Visible spectroscopy, Raman spectroscopy and Scanning Electron Microscope (SEM).The irradiated sample shows significant change in properties when compared to the pristine sample. X ray peak broadening analysis has been used to estimate the crystallite size and lattice strain. Raman spectroscopy analysis confirms the transition of ordered kesterite to disordered kesterite phase after electron irradiation at electron fluence of 4 x1015 e-/cm2. CZTS nano-particles having hierarchical flower like morphology starts agglomerating after electron irradiation as observed from SEM images. The sample did not amorphize upto the highest fluence 4 x 1015 e-/cm2 employed in this study.

MORPHOTROPIC PHASE BOUNDARY AND DIELECTRIC RELAXATION STUDY OF (Bi0.5Na0.5)TiO3–BaTiO3 LEAD-FREE CERAMIC

2012 ◽  
Vol 02 (03) ◽  
pp. 1250008 ◽  
Author(s):  
B. PARIJA ◽  
S. PANIGRAHI ◽  
T. BADAPANDA ◽  
T. P. SINHA
Keyword(s):  
Impedance Spectroscopy ◽  
Phase Boundary ◽  
Morphotropic Phase Boundary ◽  
Complex Impedance ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
Spectroscopy Analysis ◽  
Solid State Route ◽  
Shape Changes ◽  
Modulus Studies

We report the temperature and frequency dependence impedance spectroscopy of (1 - x) ( Bi 0.5 Na 0.5) TiO 3-x BaTiO 3 (abbreviated as BNT–BT) ceramics with 0 ≤ x ≤ 0.07 prepared by conventional solid-state route. X-ray diffraction analysis indicated that a solid solution is formed when BaTiO3 diffuses into the (Bi0.5Na0.5)TiO3 lattice and a morphotropic phase boundary between rhombohedral and tetragonal locates at x = 0.07. The microstructure indicated that the grain size reduces and the shape changes from rectangular to quasi-spherical with increase in BaTiO3 content. Complex Impedance Spectroscopy analysis suggested the presence of temperature-dependent relaxation process in the materials. The modulus mechanism indicated the non-Debye type of conductivity relaxation in the materials, which is supported by impedance data. The activation energies have been calculated from impedance, electric modulus studies and dc conductivity which suggests that the conductions are ionic in nature. The activation energy increases with increase of BT content up to x = 0.05 and decreases at x = 0.07 which also indicates the presence of morphotropic phase boundary at x = 0.07.

IMPEDANCE SPECTROSCOPY AND MAGNETIC PROPERTIES OF AURIVILLIUS STRUCTURES

2012 ◽  
Vol 02 (03) ◽  
pp. 1250015
Author(s):  
S. K. PATRI ◽  
R. N. P. CHOUDHARY ◽  
C. RINALDI
Keyword(s):  
Electrical Properties ◽  
Impedance Spectroscopy ◽  
Complex Impedance ◽  
Hysteresis Loops ◽  
Solid State Reaction Method ◽  
Layered Perovskite ◽  
X Ray Diffraction ◽  
Orthorhombic Crystal ◽  
Orthorhombic Crystal Structure ◽  
Layered Perovskite Structure

Bi 9-x Fe 5+x Ti 3 O 27 (x = 0-3) compounds of bismuth layered perovskite structure have been successfully prepared by solid-state reaction method. X-ray diffraction (XRD) studies revealed the orthorhombic crystal structure of all the compounds. Impedance spectroscopy has been studied to characterize the electrical properties of polycrystalline Bi 9-x Fe 5+x Ti 3 O 27 (x = 0-3) compounds. The shape of complex impedance curves inferred the contribution of bulk and grain boundary effects on the electrical properties of the compounds. Temperature dependent magnetization measurements were made from 2 K to 300 K. Narrow hysteresis loops observed at room temperature indicate antiferromagnetic behavior of the compounds.

The Effect of Low Weight Percent Multiwalled Carbon Nanotubes on the Dielectric Properties of Non-Conducting Polymer/Ceramic Nanocomposites for Energy Storage Materials

2020 ◽  
Vol 234 (1) ◽  
pp. 11-26
Author(s):  
Noor Saeed Khattak ◽  
Mohammad Saleem Khan ◽  
Luqman Ali Shah ◽  
Muhammad Farooq ◽  
Abdullah Khan ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Energy Storage ◽  
Dielectric Properties ◽  
Multiwalled Carbon Nanotubes ◽  
Functional Materials ◽  
Energy Storage Materials ◽  
X Ray Diffraction ◽  
Multiwalled Carbon ◽  
X Ray ◽  
Storage Materials

AbstractHere in this study timing saving, easy and cost effective methods has been applied for fabricating the dielectric energy storage materials. Ceramic nanoparticles (FLZC’s) have been successfully synthesized by Sol-Gel method and its nanocomposites with non-conducting polymers (PVP, PVA, PEG, PEO) and multiwalled carbon nanotubes (MWCNT’s) by one-pot blending technique. Energy dispersive x-ray diffraction (EDX), x-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transforms infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA/DTA), AC impedance analyzer and dielectric properties were determined for all the samples. Dielectric properties showed good agreement with that of energy storage substances for electronic device fabrication. High dielectric constant was achieved when 0.5 wt% MWCNT’s was added to FLZC’s/MWCNT’s/Polymer nanocomposites. The stability and performance of the nanocomposites were dependent on the type of polymer used. These preparation materials can be employed in functional materials, such as high charge-storage capacitors, electrostriction for artificial muscles and smart skins etc.

Energy-Storage Study in Lead-Free Anti-Ferroelectric Bi0.5Na0.5TiO3-BaTiO3-K0.5Na0.5NbO3 Ceramics

2013 ◽  
Vol 745-746 ◽  
pp. 679-684 ◽  
Author(s):  
Feng Gao ◽  
Xian Lin Dong ◽  
Chao Liang Mao ◽  
Fei Cao ◽  
Gen Shui Wang
Keyword(s):  
Energy Storage ◽  
Hysteresis Loops ◽  
Dielectric Constants ◽  
Lead Free ◽  
X Ray Diffraction ◽  
Phase Measurements ◽  
Storage Study ◽  
Saturated Polarization ◽  
Diffraction Patterns ◽  
Sintering Method

Lead-free (1-x-y)Bi0.5Na0.5TiO3-xBaTiO3-yK0.5Na0.5NbO3 (BNT-BT-KNN) ceramics were fabricated by traditional sintering method. The X-ray diffraction patterns showed that the ceramics are all crystallized into a perovskite structure phase. Measurements of temperature-dependent dielectric constants showed the two typical shoulders observed in the BNT-BT binary system, indicating that the ceramics are also of relaxor anti-ferroelectric nature. Moreover, it was observed that the dielectric constants decreased sharply with the increase of KNN addition, while maintained the same level when the BNT/BT ratio changed. The P-E hysteresis loops showed that the saturated polarization and the remnant polarization both decreased with the increasing addition of KNN, while the reduction of the BNT/BT ratio enhancesd the saturated polarization. The energy-storage density calculated from the P-E loops also increased with the decrease of KNN addition and BNT/BT ratio, which further demonstrated that the key for improving the energy density of BNT-BT-KNN ceramics is relatively low addition of KNN and low BNT/BT ratio.

Effects of Manganese Addition on Phase Formation Behavior and Dielectric Properties of ((K0.5Na0.5)0.935Li0.065)NbO3 Ceramics

2014 ◽  
Vol 608 ◽  
pp. 206-211
Author(s):  
Supattra Wongsaenmai ◽  
Santi Maensiri ◽  
Rattikorn Yimnirun
Keyword(s):  
Dielectric Properties ◽  
Phase Formation ◽  
Single Phase ◽  
Structural Phase ◽  
Tetragonal Symmetry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Formation Behavior ◽  
Different Grain Size ◽  
Scanning Electron

In this study, ceramics in ((K0.5Na0.5)0.935Li0.065)NbO3+ xMnO2(mol%) ceramics (when x = 0.0025, 0.0050, 0.01 and 0.015) were successfully prepared by the conventional mixed-oxide technique. The structural phase formation and microstructure were characterized by x-ray diffraction technique (XRD) and scanning electron microscopy (SEM). The crystal structure was identified by XRD as a single-phase perovskite structure, with tetragonal symmetry. The microstructure shows different grain size with different composition x. This study clearly showed that the Mn has influence on the dielectric properties in ((K0.5Na0.5)0.935Li0.065)NbO3ceramics.

scholarly journals The Effect of Ca Dopant on the Electrical and Dielectric Properties of BaTi4O9 Sintered Ceramics

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5375
Author(s):  
Asad Ali ◽  
Muhammad Hasnain Jameel ◽  
Sarir Uddin ◽  
Abid Zaman ◽  
Zafar Iqbal ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Energy Storage ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Impedance Spectroscopy ◽  
Energy Loss ◽  
Interfacial Polarization ◽  
Storage Material ◽  
Energy Storage Material ◽  
The Impact

The current research examines the impact of Ca2+ substitution on the phase and electrical properties of (Ba1−xCax)Ti4O9, (x = 0.0, 0.3, 0.6, and 0.9) sintered pellets synthesized by solid-state reaction method. The as-synthesized samples were analyzed using X-ray diffraction (XRD) and impedance spectroscopy. The emergence of orthorhombic phase fit into space group Pnmm was revealed by XRD, and the addition of Ca resulted in a considerable shift in grain size. Dielectric properties were determined using an impedance spectroscopy in a wide frequency range from 1MHz to 3 GHz. The dielectric properties i.e., dielectric constant (εr) and dielectric loss (tanσ), were measured at 3 GHz frequency. The frequency-dependent parameters such as conductivity, dielectric constant, and dielectric loss indicated that the relaxation process is a Maxwell–Wagner type of interfacial polarization. The improved dielectric properties and low energy loss have made (Ba1−xCax)Ti4O9 a prominent energy storage material. This study provides the possibility to improve its dielectric properties and reduce energy loss, making it an excellent energy storage material.

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