scholarly journals Effects of sintering temperature and holding time on the microstructure and electric properties of Ba(Zr0.3Ti0.7)O3 ceramics

2018 ◽  
Vol 12 (1) ◽  
pp. 45-55 ◽  
Author(s):  
Xiaoya Zhang ◽  
Gang Chen ◽  
Chunlin Fu ◽  
Wei Cai ◽  
Rongli Gao ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Room Temperature ◽  
Sintering Temperature ◽  
Perovskite Phase ◽  
Hysteresis Loops ◽  
Holding Time ◽  
X Ray Diffraction ◽  
Conventional Solid State Reaction ◽  
Structure Surface ◽  
Ferroelectric Hysteresis

Ba(Zr0.3Ti0.7)O3 (BZT) ceramics was prepared by using conventional solid state reaction. The effects of sintering temperature and holding time on the crystal structure, surface morphology, dielectric, ferroelectric and piezoelectric properties of the BZT ceramics were systematically investigated. X-ray diffraction (XRD) results confirm single cubic perovskite phase in all the sintered samples. Microstructure analysis using scanning electron microscopy (SEM) reveals that the grain sizes increase with increasing the sintering temperature. Dielectric spectroscopy performed in the range of 20Hz to 2MHz at room temperature shows that the dielectric constant increases with the sintering temperature and the dielectric constant of the BZT ceramics sintered at 1400?C for 8 h is around 11500. The ferroelectric hysteresis loops show that the coercive field decreases with the holding time, while the remnant polarization does not change obviously. The maximum strain is 0.023%for the sample sintered at 1400?C for 4 h. It is found that the maximum value of the direct piezoelectric coefficient (d33) of the BZT ceramics sintered at 1400?C for 8 h measured at room temperature is 36.7 pC/N.

Dielectric, ferroelectric, and ferromagnetic properties of 0.7Bi1−xLax(Fe0.9Cr0.1)O3–0.1BaTiO3–0.2PbTiO3 solid solutions

2010 ◽  
Vol 25 (9) ◽  
pp. 1812-1816 ◽  
Author(s):  
Xiao-hui Liu ◽  
Zhuo Xu ◽  
Xiao-yong Wei ◽  
Xi Yao
Keyword(s):  
Solid Solutions ◽  
Room Temperature ◽  
Hysteresis Loops ◽  
Weak Ferromagnetism ◽  
Lattice Parameter ◽  
X Ray Diffraction ◽  
Crystal Lattices ◽  
Temperature Polarization ◽  
Polarization Electric Field ◽  
Ferroelectric Hysteresis

Solid solutions 0.7Bi1−xLax (Fe0.9Cr0.1) O3–0.1BaTiO3–0.2PbTiO3 (BLxFOC-BT-PT, with x = 0, 0.03, 0.05, 0.07) solid solutions were prepared by the traditional ceramic process. X-ray diffraction results reveal that all samples show pure pseudocubic perovskites structure. The lattice parameter of the solid solutions increases linearly with the La content, indicating that La ions have entered crystal lattices to form a solid solution. The Curie temperature of the solid solutions decreases with the La content. Room-temperature polarization–electric field (P–E) curves indicate that the samples with x = 0.03 and 0.05 exhibit saturated P–E loops. Piezoelectric constant d33 of the solid solutions increases firstly and then decreases. Magnetizations of the solid solutions decrease with the La content. The evidence of weak ferromagnetism and saturated ferroelectric hysteresis loops in BLxFOC–BT–PT system at room temperature makes it a good candidate for multiferroic applications.

Room Temperature Magnetoelectric Coupling in Bi5Ti3FeO15 Ceramics

2013 ◽  
Vol 668 ◽  
pp. 762-766 ◽  
Author(s):  
X.Q. Chen ◽  
Xiang Bin Zeng ◽  
F.J. Yang ◽  
X.P. Kong ◽  
C. Wei ◽  
...  
Keyword(s):  
Electric Field ◽  
Room Temperature ◽  
Magnetic Measurement ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Solid State Reaction Method ◽  
Layered Perovskite ◽  
Conventional Solid State Reaction ◽  
Magnetic Dipoles ◽  
Ferroelectric Hysteresis

Magnetoelectric(ME) coupling at room temperature(RT) in four-layered perovskite Bi5Ti3FeO15(BTFO) ceramics prepared by conventional solid state reaction method was observed. Unsaturated ferroelectric hysteresis loop with 2Pr=0.464 μC/cm2 and 2Ec=25 kV/cm at an applied electric field 58 kV/cm was obtained because of lower breakdown voltage which maybe induced by lower relative density of the sample. A weak ferromagnetic (Mr=0.122 memu/g, Hc=69 Oe) rather than an antiferromagnetic property was observed at RT by magnetic measurement. Significantly, the ME coupling between the electric dipoles and magnetic dipoles at RT was demonstrated by measuring the effect of magnetic and DC electric poling on ferroelectric and magnetic hysteresis loops, respectively. Both Pr and Mr decreased after magnetic and DC electric poling. And the rate of Pr change decreased with increasing measuring electric field.

Structural and dielectric properties of SrFexTi1-xO3 (x = 0.001, 0.005 and 0.01) ceramics

2013 ◽  
Vol 03 (01) ◽  
pp. 1350006
Author(s):  
Zhanwu Yu ◽  
Peng Shi ◽  
Wei Ren ◽  
Xiaoqing Wu ◽  
Xi Yao
Keyword(s):  
Dielectric Constant ◽  
Grain Size ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Leakage Current ◽  
Lattice Constant ◽  
Doping Concentration ◽  
Sintering Temperature ◽  
X Ray Diffraction ◽  
Conventional Solid State Reaction

Three different SrFe x Ti 1-x O 3(x = 0.001, x = 0.005, x = 0.01) ceramics were prepared by the conventional solid-state reaction. The crystalline structure, surface morphology and dielectric properties were studied by X-ray diffraction (XRD), scanning electron microscope (SEM) and Agilent 4294A impedance analyzer, respectively. It is shown that both the sintering temperature and doping concentration influence the lattice constant, grain size, dielectric constant and the dielectric loss. When the sintering temperature is higher than 1390°C, the lattice constant, grain size and dielectric constant all decrease with the increase of the doping concentration, except the dielectric loss tangent which shows the opposite trend. Leakage current tests show that the leakage current density falls down with the increase of Fe doping concentration in the given region.

Effects of ZnO Doping on Microstructure, Dielectric and Ferroelectric Properties of La2Ti2O7 Ceramics

2014 ◽  
Vol 602-603 ◽  
pp. 719-722
Author(s):  
Gang Chen ◽  
Xiao Dong Peng ◽  
Chun Lin Deng ◽  
Chun Lin Fu ◽  
Wei Cai ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Ferroelectric Properties ◽  
Solid State Reaction Method ◽  
Second Phase ◽  
X Ray Diffraction ◽  
Conventional Solid State Reaction ◽  
Dielectric Constant And Loss ◽  
Diffraction Patterns ◽  
Ferroelectric Hysteresis ◽  
Zno Doping

The La2Ti2O7+xwt%ZnO(x=0, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5) ceramics were prepared by the conventional solid state reaction method, and effects of ZnO doped on the structure, dielectric and ferroelectric properties were investigated in detail. The X-ray diffraction patterns of La2Ti2O7ceramics doped by ZnO oxide showed that no second phase exists. The surface morphology is palte-like shape, the grains of La2Ti2O7ceramics increase with increasing the content of ZnO, and the result is to improve the density of La2Ti2O7ceramics. The dielectric constant and loss decreases with increasing frequency.When the content of ZnO is more than 0.05wt%, the dielectric constant and loss decreases with the amount of addition of ZnO oxide increasing. The ferroelectric hysteresis loop is not saturable, which is attributed to its large leakage current. The ferroelectric properties improve with the addition of ZnO oxide. .

scholarly journals Epitaxial Growth and Multiferroic Properties of (001)-Oriented BiFeO3-YMnO3 Films

2015 ◽  
Vol 2 (3-4) ◽  
pp. 157-162
Author(s):  
Peng-Xiao Nie ◽  
Yi-Ping Wang ◽  
Ying Yang ◽  
Guo-Liang Yuan ◽  
Wei Li ◽  
...  
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
Single Phase ◽  
Hysteresis Loops ◽  
Laser Deposition ◽  
X Ray Diffraction ◽  
Leakage Currents ◽  
X Ray ◽  
Multiferroic Properties ◽  
Ferroelectric Hysteresis

Abstract In this paper, high-quality multiferroic (1-x)BiFeO3-xYMnO3 (x=0.05, 0.10, 0.15) thin films were successfully epitaxially grown on (001)SrTiO3 substrates with La0.67Sr0.33MnO3 buffered layers by pulsed laser deposition (PLD). X-ray diffraction shows the thin films are all single-phase perovskite with preferential orientation along the (001) direction. The (002) diffraction angles of thin films (from 0 to 0.15) shift to right, indicating the decrease of lattice parameters. All YMnO3-doped thin films exhibit strong upward self-poling via piezoelectric force microscope (PFM) measurement. Saturated ferroelectric hysteresis loops of thin films cannot be obtained even at the frequency of 50 kHz because of large leakage currents. It is noted that BFO-YMO thin films exhibit ferroelectricity considering the PFM and ferroelectric test. The magnetization measurements show that all BiFeO3-based films exhibit weak ferromagnetic behaviors with saturated magnetization at room temperature. The enhancement of magnetization was observed because of YMO doping, with the maximum saturation magnetization (M s) of 17.07 emu/cm3 in x=0.10 thin film.

scholarly journals Structural, Electrical, Magnetic and Optical Properties of BaTi1-x(Ni1/2Nb1/2)xO3 Ceramics

2021 ◽  
Author(s):  
sheng li ◽  
yuanyuan zhang ◽  
Lisa Zhou ◽  
Qingqing Liu ◽  
Jing Yang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Room Temperature ◽  
Magnetic Measurement ◽  
Hysteresis Loops ◽  
Solid State Reaction Method ◽  
Conventional Solid State Reaction ◽  
Co Doping ◽  
Nb Doping ◽  
Ferroelectric Hysteresis ◽  
Ferromagnetic Ordering

Abstract In this work, we have investigated the structural, electrical, magnetic and optical properties of Ni-Nb co-doped BaTiO3 ceramics. The compositions of BaTi1 − x(Ni1/2Nb1/2)xO3 were prepared through conventional solid-state reaction method. All the samples exhibit a gradual phase transition behavior from the tetragonal to a cubic structure with the increase of Ni-Nb co-doping concentration. The temperature dependence of the dielectric constant reveals that the transition temperature gradually decreased with an increase in Ni2+ and Nb5+ concentrations. The ferroelectric studies show these doping samples have relatively full ferroelectric hysteresis loops at room temperature, but exhibit a decreasing ferroelectric property with the increasing level of doping. The magnetic measurement suggests that these samples have ferromagnetic ordering at room temperature with an increase in the Ni-Nb doping. Moreover, band gaps of these samples are obviously reduced through the strategy of co-doping.

scholarly journals Effects of Sintering Temperature on Structural and Electrical Properties of Fe3+ Doping PZT Ceramics

2020 ◽  
Vol 17 (2) ◽  
pp. 4-7
Author(s):  
Alina Iulia Dumitru ◽  
Florentina Clicinschi ◽  
Tudor-Gabriel Dumitru ◽  
Delia Patroi ◽  
Jana Pintea ◽  
...  
Keyword(s):  
Room Temperature ◽  
Sintering Temperature ◽  
Hysteresis Loops ◽  
X Ray Diffraction ◽  
Solid State Reaction Technique ◽  
Pzt Ceramics ◽  
X Ray ◽  
Structural And Electrical Properties ◽  
Perovskite Type ◽  
Perovskite Type Structure

AbstractThe influence of the sintering temperature on the structure and on the hysteresis loops of Fe3+ doped Pb(ZrxTi1-x)O3 system has been investigated. Three compositions have been selected in the following mode: one in rhombohedral region, one in MPB region and one in tetragonal region have been obtained by solid state reaction technique. Sintering has been carried out at 12000C and 12500C respectively. The nature of the phases has been investigated in detail using X-ray diffraction analysis (XRD). All the sintered samples reveal a perovskite type structure. The surfaces have been lapped and metalized in order to obtaine the hysteresis loops at room temperature. The results showed a similar behaviour with “hard” PZT ceramics.

scholarly journals Influence of CuO addition on dielectric and piezoelectric properties of (Bi0.5Na0.5)TiO3–BaTiO3lead-free piezoceramics

2021 ◽  
pp. 2140004
Author(s):  
M. Difeo ◽  
L. Ramajo ◽  
M. Castro
Keyword(s):  
Hysteresis Loops ◽  
Solid State Reaction Method ◽  
Sem Analysis ◽  
Sintering Behavior ◽  
X Ray Diffraction ◽  
Conventional Solid State Reaction ◽  
Doping Effects ◽  
Density Values ◽  
Spectroscopy Studies ◽  
Ferroelectric Hysteresis

Doping effects of CuO on the sintering behavior and electrical properties of 0.94(Bi[Formula: see text]Na[Formula: see text]TiO3–0.06(BaTiO[Formula: see text]–[Formula: see text]CuO (BNT–BT6–[Formula: see text]Cu) 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 values when it is sintered at 1150[Formula: see text]C, however, the doped system was sintered at 1150[Formula: see text]C, 1100[Formula: see text]C, 1050[Formula: see text]C, 1025[Formula: see text]C, and 975[Formula: see text]C to determine the effect of Cu on the densification process. Therefore, it was obtained that the CuO-doped samples sintered at 1050[Formula: see text]C presented the highest density values and therefore were the ones chosen to perform the characterization tests together with the undoped system. The samples were characterized using X-ray diffraction (XRD), Raman microspectroscopy, and scanning electron microscopy (SEM) analysis, whereas the ferroelectric and dielectric properties were evaluated by means of ferroelectric hysteresis loops and impedance spectroscopy studies. As a result, the addition of CuO allowed an improvement in sinterability and densification, with the subsequent grain growth, and the improvement of the piezoelectric coefficient ([Formula: see text].

scholarly journals Synthesis and Na+ Ion Conductivity of Stoichiometric Na3Zr2Si2PO12 by Liquid-Phase Sintering with NaPO3 Glass

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3790
Author(s):  
Yongzheng Ji ◽  
Tsuyoshi Honma ◽  
Takayuki Komatsu
Keyword(s):  
Solid State ◽  
Liquid Phase ◽  
Sintering Temperature ◽  
Liquid Phase Sintering ◽  
Ion Conductivity ◽  
X Ray Diffraction ◽  
Conventional Solid State Reaction ◽  
X Ray ◽  
Sintering Time ◽  
Lower Activation

Sodium super ionic conductor (NASICON)-type Na3Zr2Si2PO12 (NZSP) with the advantages of the high ionic conductivity, stability and safety is one of the most famous solid-state electrolytes. NZSP, however, requires the high sintering temperature about 1200 °C and long sintering time in the conventional solid-state reaction (SSR) method. In this study, the liquid-phase sintering (LPS) method was applied to synthesize NZSP with the use of NaPO3 glass with a low glass transition temperature of 292 °C. The formation of NZSP was confirmed by X-ray diffraction analyses in the samples obtained by the LPS method for the mixture of Na2ZrSi2O7, ZrO2, and NaPO3 glass. The sample sintered at 1000 °C for 10 h exhibited a higher Na+ ion conductivity of 1.81 mS/cm at 100 °C and a lower activation energy of 0.18 eV compared with the samples prepared by the SSR method. It is proposed that a new LPE method is effective for the synthesis of NZSP and the NaPO3 glass has a great contribution to the Na+ diffusion at the grain boundaries.

scholarly journals Transport and Dielectric Properties of Mechanosynthesized La2/3Cu3Ti4O12 Ceramics

Crystals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 313
Author(s):  
Mohamad M. Ahmad ◽  
Hicham Mahfoz Kotb ◽  
Celin Joseph ◽  
Shalendra Kumar ◽  
Adil Alshoaibi
Keyword(s):  
Dielectric Constant ◽  
Sintering Temperature ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Boundary Conductivity ◽  
X Ray ◽  
Giant Dielectric ◽  
Mechanochemical Milling ◽  
Giant Dielectric Constant ◽  
Lower Temperature

La2/3Cu3Ti4O12 (LCTO) powder has been synthesized by the mechanochemical milling technique. The pelletized powder was conventionally sintered for 10 h at a temperature range of 975–1025 °C, which is a lower temperature process compared to the standard solid-state reaction. X-ray diffraction analysis revealed a cubic phase for the current LCTO ceramics. The grain size of the sintered ceramics was found to increase from 1.5 ± 0.5 to 2.3 ± 0.5 μm with an increase in sintering temperature from 975 to 1025 °C. The impedance results show that the grain conductivity is more than three orders of magnitude larger than the grain boundary conductivity for LCTO ceramics. All the samples showed a giant dielectric constant (1.7 × 103–3.4 × 103) and dielectric loss (0.09–0.17) at 300 K and 10 kHz. The giant dielectric constant of the current samples was attributed to the effect of internal barrier layer capacitances due to their electrically inhomogeneous structure.

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