Fabrication and Electrical Properties of Strontium Doped Lanthanum Manganite Titanite Oxide

2015 ◽  
Vol 1107 ◽  
pp. 278-282
Author(s):  
Siti Hashimah Mohd Hanif ◽  
Walter Charles Primus ◽  
Abdul H. Shaari ◽  
Hassan Jumiah
Keyword(s):  
Electrical Properties ◽  
Low Frequency ◽  
Solid State Reaction Method ◽  
Electrical Measurement ◽  
Electrical Circuit ◽  
Lanthanum Manganite ◽  
X Ray ◽  
Impedance Plane ◽  
Complex Capacitance ◽  
Lcr Meter

Composition of La0.7Sr0.3Mn0.4Ti0.6O3has been prepared using solid state reaction method where its crystal structure and electrical properties has been analyzed using X-ray Diffractometer (XRD) and Low frequency LCR meter, respectively. The result, shows that the sample has cubic perovskite structure with the existence of impurities phase. In electrical measurement, the frequency dependence of complex capacitance plot shows the sample have strong dispersion at lower frequency and the impedance plane plot shows a semicircle due to the grain effect. The sample electrical properties are also represented in equivalent electrical circuit which consists of a quasi d.c and in parallel with conductance.

Temperature Dependence on Dielectric Response of La0.7Ba0.3Mn0.4Ti0.6O3 Ceramic

2015 ◽  
Vol 1107 ◽  
pp. 45-52
Author(s):  
Aaliyawani Ezzerin Sinin ◽  
Walter Charles Primus ◽  
Abdul Halim Shaari ◽  
Zainal Abidin Talib ◽  
Sinin Hamdan
Keyword(s):  
Dielectric Properties ◽  
Temperature Dependence ◽  
Low Frequency ◽  
Sintered Sample ◽  
Solid State Reaction Method ◽  
X Ray Diffraction ◽  
Conventional Solid State Reaction ◽  
Low Frequencies ◽  
X Ray ◽  
Lcr Meter

Ceramic sample of La0.70Ba0.30Mn0.40Ti0.60O3 oxide has been prepared by the conventional solid-state reaction method. The sintered sample was characterized by using x-ray diffraction (XRD) and low frequency LCR meter. XRD result shows that the sample has a cubic structure with the existence of impurity phase. The dielectric properties of La0.70Ba0.30Mn0.40Ti0.60O3 measured from room temperature to 200°C shows that the dielectric permittivity is temperature dependence with strong dispersion at low frequencies. A circuit model based on the universal capacitor response function is also being used to represent the dielectric properties of the sample.

scholarly journals Influence of Li2CO3 addition on electrical and magnetic properties of Ni0.6Mg0.4Fe2O4

2020 ◽  
Vol 10 (03) ◽  
pp. 2050003
Author(s):  
M. R. Hassan ◽  
M. T. Islam ◽  
M. N. I. Khan
Keyword(s):  
Magnetic Properties ◽  
Single Phase ◽  
Low Frequency ◽  
Solid State Reaction Method ◽  
Charge Carriers ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrical And Magnetic Properties ◽  
Frequency Regime ◽  
Xrd Patterns

In this research, influence of adding Li2CO3 (at 0%, 2%, 4%, 6%) on electrical and magnetic properties of [Formula: see text][Formula: see text]Fe2O4 (with 60% Ni and 40% Mg) ferrite has been studied. The samples are prepared by solid state reaction method and sintered at 1300∘C for 6[Formula: see text]h. X-ray diffraction (XRD) patterns show the samples belong to single-phase cubic structure without any impurity phase. The magnetic properties (saturation magnetization and coercivity) of the samples have been investigated by VSM and found that the higher concentration of Li2CO3 reduces the hysteresis loss. DC resistivity increases with Li2CO3 contents whereas it decreases initially and then becomes constant at lower value with temperature which indicates that the studied samples are semiconductor. The dielectric dispersion occurs at a low-frequency regime and the loss peaks are formed in a higher frequency regime, which are due to the presence of resonance between applied frequency and hopping frequency of charge carriers. Notably, the loss peaks are shifted to the lower frequency with Li2CO3 additions.

scholarly journals Structure and electric properties of cerium substituted SrBi1.8Ce0.2Nb2O9 and SrBi1.8Ce0.2Ta2O9 ceramics

2016 ◽  
Vol 10 (3) ◽  
pp. 183-188 ◽  
Author(s):  
Mohamed Afqir ◽  
Amina Tachafine ◽  
Didier Fasquelle ◽  
Mohamed Elaatmani ◽  
Jean-Claude Carru ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Solid State ◽  
Room Temperature ◽  
Single Phase ◽  
Solid State Reaction Method ◽  
X Ray Diffraction ◽  
Reaction Method ◽  
X Ray ◽  
Lcr Meter ◽  
Curie Temperature Tc

SrBi1.8Ce0.2Nb2O9 (SBCN) and SrBi1.8Ce0.2Ta2O9 (SBCT) powders were prepared via solid-state reaction method. X-ray diffraction analysis reveals that the SBCN and SBCT powders have the single phase orthorhom-bic Aurivillius structure at room temperature. The contribution of Raman scattering and FTIR spectroscopy of these samples were relatively smooth and resemble each other. The calcined powders were uniaxially pressed and sintered at 1250?C for 8 h to obtaine dense ceramics. Dielectric constant, loss tangent and AC conductivity of the sintered Ce-doped SrBi2Nb2O9 and SrBi2Ta2O9 ceramics were measured by LCR meter. The Ce-doped SBN (SBCN) ceramics have a higher Curie temperature (TC) and dielectric constant at TC (380?C and ?? ~3510) compared to the Ce-doped SBT (SBCT) ceramics (330?C and ?? ~115) when measured at 100Hz. However, the Ce-doped SBT (SBCT) ceramics have lower conductivity and dielectric loss.

scholarly journals Study of electrical properties of a reduced graphene-oxadiazole-2-thiol (rGS) PVA polymer composite

2018 ◽  
Vol 27 (1) ◽  
pp. 11-19 ◽  
Author(s):  
Emaad T Bakir Al-Tikrity ◽  
Ibrahim F Waheed ◽  
Sabah M Ali
Keyword(s):  
Electrical Properties ◽  
Room Temperature ◽  
Composite Films ◽  
Low Frequency ◽  
Covalent Bonding ◽  
Poly Vinyl Alcohol ◽  
X Ray Diffraction ◽  
X Ray ◽  
Reduced Graphene ◽  
Tan Δ

This work reports the synthesis and characterisation of reduced graphene-1,3,4-oxadiazole-2-thiol (rGS) as a novel nanocompound derivative for graphene. The preparation was performed through a series of reactions starting from graphene oxide, followed by incorporation of different proportions of this nanocompound with poly(vinyl alcohol) (PVA), via non-covalent bonding, to afford the rGS/PVA polymer composites. The pure rGS compound, rGS/PVA composite films and pure PVA film were characterised by different techniques including infrared (Fourier transform infrared) spectroscopy, scanning electron microscopy and powder x-ray diffraction. The electrical properties of the composite films, involving dielectric constant, permittivity ( ε′), imaginary permittivity ( ε″), conductivity (σAC) and loss factor tan δ, were investigated. The measurements were performed at frequencies of (5kHz to 0.5 MHz) at room temperature. At low frequency, the dielectric permittivity ( ε′) and imaginary permittivity ( ε″) attained higher values in all cases, although with increasing frequency these values diminished rapidly. It was also found that the alternating current conductivity of the composites increased with increasing frequency.

Cationic Distribution and Electrical Properties of Ni0.6Mn2Si0.4-xAlxO4 (0≤x≤0.04) NTC Thermistor

2016 ◽  
Vol 868 ◽  
pp. 79-83
Author(s):  
Sen Liang ◽  
Xiao Zhang ◽  
Hai Bo Li ◽  
Mang Mang Gao ◽  
Jin Li
Keyword(s):  
Electrical Properties ◽  
Tetrahedral Site ◽  
Negative Temperature ◽  
Solid State Reaction Method ◽  
Molar Content ◽  
Conventional Solid State Reaction ◽  
X Ray ◽  
Valence States ◽  
Cationic Distribution ◽  
Ntc Thermistor

Negative temperature coefficient (NTC) ceramics with general composition Ni0.6Mn2Si0.4-xAlxO4 (0≤x≤0.04) were prepared by conventional solid-state reaction method and were investigated for cationic distribution and electrical properties. X-ray diffraction (XRD) confirmed that the Si cations occupied the tetrahedral site. The valence states of Mn ions were characterized by X-ray photoelectron spectral (XPS). The results showed that Mn4+ content decreased from 0.19 mol to 0.185 mol when the Si molar content declined from 0.4 to 0.1, i.e. the content of Mn4+ was 0.197mol when x was equal to 0.4. Besides, the resistivity (ρ25) reached the minimum value when the Si molar content was 0 (ρ25=4.07×104Ω·cm).

Phase Transition and Electrical Properties of Ba0.8Sr0.2TiO3: Comparison of Different Preparation Techniques

2017 ◽  
Vol 866 ◽  
pp. 287-290
Author(s):  
Thanawat Kytae ◽  
Krit Sutjarittangtham ◽  
Theerapol Thurakitseree ◽  
Wilaiwan Leenakul
Keyword(s):  
Electron Microscopy ◽  
Phase Transition ◽  
Electrical Properties ◽  
Molten Salt ◽  
Preparation Technique ◽  
X Ray Diffraction ◽  
X Ray ◽  
Lcr Meter ◽  
Preparation Techniques ◽  
Scanning Electron

This research studied the effect of the different preparation technique on phase transition and electrical properties of Ba0.8Sr0.2TiO3. The samples compared 3 preparation technique, there are conventional mix-oxide, molten-salt and seed-induced method. The samples prepared by molten-salt calcined at 800 °C, the samples prepared by conventional mix-oxide and seed-induced method was calcined at 1200 °C for 3 h. All of samples sintered at 1400 °C for 3 h. The phase formation and morphology of samples were characterized via X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The dielectric properties of the samples were measurement by LCR-meter.

scholarly journals KARAKTERISTIK FISIS ALUMINOSILIKAT GEOPOLIMER BERBASIS SILIKA SEKAM PADI UNTUK APLIKASI FAST IONIC CONDUCTOR

REAKTOR ◽  
2017 ◽  
Vol 17 (2) ◽  
pp. 96
Author(s):  
Agus - Riyanto ◽  
Simon - Sembiring ◽  
Junaidi -
Keyword(s):  
Electrical Conductivity ◽  
Electrical Properties ◽  
Xrd Analysis ◽  
Sodium Aluminate ◽  
Ionic Conductor ◽  
X Ray ◽  
Calcination Temperatures ◽  
Ionic Electrical Conductivity ◽  
Lcr Meter ◽  
Fast Ionic Conductor

The study aims to investigate the effect of calcination temperatures on the phase formation and electrical properties of aluminosilicate geopolymer prepared from rice husk silica and sodium aluminate. The samples were calcined at temperature from 150 oC to 550 oC, the development of structures was characterized using x-ray difraction (XRD) and the electrical properties were measured by LCR meter. The result obtained indicated the significant role of calcining temperature on phase transformation of boehmite and quartz into aluminosilicate geopolymer, in which at calcining temperatures from 450 oC to 550 oC, and  the samples were dominated by semicrystal to amorphous phase which indicated that the aluminosilicate geoplymer has been formed. The presence of aluminosilicate geopolymer resulted in increased ionic electrical conductivity and dielectric loss factor as well as decrease dielectric constant. Ionic electrical conductivity of the calcined sample at 450 oC is 4,49.10-5 S/cm at frequancy of 5.106 Hz, and XRD analysis demostrated that the main structure is phase of semicrystal aluminosilicate geopolymer. Based on these character, the sample was considered is very suitable used to the fast ionic conductor materials.Studi ini bertujuan untuk menginvestigasi efek suhu kalsinasi pada formasi fasa dan sifat listrik aluminosilikat geopolimer yang dipreparasi dari silika sekam padi dan sodium aluminat. Sampel dikalsinasi pada suhu 150 oC – 550 oC, perubahan struktur dikarakterisasi menggunakan x-ray difraction (XRD) dan sifat listrik diukur menggunakan LCR meter. Hasil yang diperoleh mengindikasikan pengaruh yang signifikan suhu kalsinasi pada transformasi boehmite dan quartz menjadi aluminosilikat geopolimer, dimana pada suhu kalsinasi 450 oC – 550 oC didominasi oleh fasa semikristal hingga amorf yang mencirikan terbetuknya aluminosilikat geopolimer. Terbentuknya struktur aluminosilikat geopolimer diikuti dengan peningkatan konduktivitas listrik ionik, penurunan konstanta dielektrik, serta peningkatan faktor rugi dielektrik. Nilai konduktivitas listrik ionik sampel kalsinasi 450 oC ialah 4,49.10-5 S/cm pada frekuensi 5.106 Hz, dan analisis XRD menunjukkan struktur utamanya berupa fasa semikristal aluminosilikat geopolimer. Berdasarkan karakteristik tersebut, sampel yang ditinjau merupakan material dengan konduktivitas ionik yang tinggi sehingga sampel tersebut sangat potensial untuk dimanfaatkan sebagai fast ionic conductor.

scholarly journals Relaxor Phase Evolution of (Bi0.5Na0.5-xKx)TiO3 Ceramics due to K Ion Substitution and Their Corresponding Electrical Properties

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 455 ◽  
Author(s):  
Sam Yeon Cho ◽  
Eun-Young Kim ◽  
Sun Yong Kim ◽  
Thuy Linh Pham ◽  
Jin Kyu Han ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Phase Evolution ◽  
Xrd Analysis ◽  
Solid State Reaction Method ◽  
Tetragonal Structure ◽  
X Ray Diffraction ◽  
Conventional Solid State Reaction ◽  
X Ray ◽  
Structural And Electrical Properties ◽  
Ion Substitution

We synthesized lead-free piezoelectric (Bi0.5Na0.5-xKx)TiO3 (BNKT) ceramics using a conventional solid-state reaction method. We have investigated the structural and electrical properties of the materials with x = 0.05 to 0.40. The X-ray diffraction (XRD) analysis suggests that the BNKT ceramics show the transition from rhombohedral to tetragonal structure. The ratio of the tetragonal structure increased continuously in accordance with the increasing composition of x. The sample of x = 0.10 showed a similar ratio between the tetragonal and rhombohedral structures. Frequency-dependent dielectric measurements showed a sort of relaxor properties emerged with increasing x composition, this effect may be interpreted in terms of the formation of polar nano-regions (PNRs) in samples. The value of remnant polarization (Pr) decreases rapidly as x increases beyond the point of x = 0.10 from 25.3 μC/cm2 to 5.9 μC/cm2. On the contrary, as for inverse piezoelectric coefficient (d33*), a higher value of d33* (336 pm/V) at x = 0.10, was observed when compared with x = 0.05 (d33* = 51 pm/V). These results can be explained by the formation of PNRs and their variations with the external applied field. We here propose a possible mechanism showing the effects of dipolar defects, which can be resulted from the K ion substitution on (Bi,Na)TiO3 (BNT) ceramics.

scholarly journals Effect of Cr3+ substitution on magnetic and electrical properties of (Ni0.3Cu0.7) Fe2O4 spinel ferrites

2020 ◽  
Vol 66 (5 Sept-Oct) ◽  
pp. 573
Author(s):  
K. Bashir Bashir ◽  
M. -ul-Islam ◽  
M. Ajmal ◽  
M. Waqas Nafees ◽  
A. Iftikhar ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Electrical Properties ◽  
Sol Gel ◽  
Phenomenological Theory ◽  
Spinel Ferrites ◽  
Tangent Loss ◽  
X Ray Diffraction ◽  
X Ray ◽  
Lcr Meter ◽  
Magnetic And Electrical Properties

Chromium substituted copper base spinel ferrites (Ni0.3Cu0.7)CrxFe2-xO4 were prepared by Sol-gel method. Structural, magnetic and electrical properties were studied by utilizing X-ray diffractometer, Vibrating sample magnetometer, and precision LCR-meter using lab-tracer software. The X-ray diffraction analysis confirmed the formation of single phase fcc structure of the samples. The lattice constant and crystallite size decreased from 8.37-8.23Å and 53.09-35.36nm respectively with increasing content of Cr3+ ions. From MH loops it was observed that the saturation magnetization decreased and coercivity increased with increasing content of Cr3+ ions. Dc resistivity increased with increase of Cr3+ concentration and decreased with increase in temperature which shows the semiconducting behavior of ferrites. The dielectric constant, dielectric loss and tangent loss decreased with increase of Cr3+ concentration. The dielectric constant follows bilayer Maxwell Wagner model and Koop’s phenomenological theory while ac conductivity increased with increasing frequency following Jonscher’s power law.

Electrical Properties of BNKTZ Ceramics as a Function of Calcination Temperature

2016 ◽  
Vol 872 ◽  
pp. 103-108
Author(s):  
Pichitchai Butnoi ◽  
Supalak Manotham ◽  
Pharatree Jaita ◽  
Ratabongkot Sanjoom ◽  
Denis Russell Sweatman ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Calcination Temperature ◽  
Piezoelectric Properties ◽  
Solid State Reaction Method ◽  
X Ray Diffraction ◽  
Conventional Solid State Reaction ◽  
X Ray ◽  
Xrd Patterns ◽  
Ferroelectric And Piezoelectric Properties ◽  
Xrd Method

In this research, the Bi0.5(Na0.80K0.20)0.5Ti0.99Ti0.10O3 were prepared via a conventional solid-state reaction method, and their properties were related with calcination temperature. The crystalline structure of BNKTZ ceramics was assessed by X-ray diffraction (XRD) method. Other physical properties, i.e. porosity, density, microstructure, and electrical properties were determined. XRD patterns for all samples showed a pure perovskite, where coexistence between rhombohedral and tetragonal phases was observed for some conditions. The optimum dielectric constant was obtained for the ceramic calcined at 800 °C. The ferroelectric and piezoelectric properties were improved and showed the highest values for the calcination temperature around 900-1000°C. The improvements of ferroelectric and piezoelectric properties were proposed to be due to the ceramics had compositions closed to MPB composition. Furthermore, density also had a contribution for the improvements.

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