“…The previous report shows that the system (1−y)BFO-yNNO has rhombohedral crystal structure. However, with the rise of NNO contents in BFO, a change in crystal structure from rhombohedral to orthorhombic [35]. It is observed that most of the peaks match and are well compared with the reported data [36,37].…”
Section: Xrd and Sem Analysissupporting
confidence: 75%
“…[32]. This has enabled researchers to synthesise BiFeO 3 -NaNbO 3 (BFO-NNO) by using various experimental techniques and significant properties [33][34][35]. Keeping in the view of the above and realising the importance of rare earth impurities, an attempt has been made to synthesise Lanthanum (La) doped BFO-NNO composite.…”
The composites, (1−x)(BiFe 1-y La y O 3 )-xNaNbO 3 with x = 0.25, 0.45 and y = 0.10, 0.20, are prepared by mixed oxide method. XRD analysis shows rhombohedral (hexagonal) structure at room temperature. The properties such as dielectric loss (tanδ) and dielectric constant (ε r ) of all the samples are studied. A significant improvement in dielectric constants has been observed with the rise of Lanthanum (La) content. A dielectric anomaly above 350°C is observed for all the studied materials. Further, it is observed that ac conductivity (σ ac ) spectrum obeys universal Jonscher's power law. The variation of σ ac with inverse of temperature for all the samples is found to obey the Arrhenius equation. The formation of loop in polarisation verses electric field curve establishes the ferroelectric (FE) nature of all the studied samples. Current (I)-Electric Field (E) loops is studied to show the behaviour of domain switching.
“…The previous report shows that the system (1−y)BFO-yNNO has rhombohedral crystal structure. However, with the rise of NNO contents in BFO, a change in crystal structure from rhombohedral to orthorhombic [35]. It is observed that most of the peaks match and are well compared with the reported data [36,37].…”
Section: Xrd and Sem Analysissupporting
confidence: 75%
“…[32]. This has enabled researchers to synthesise BiFeO 3 -NaNbO 3 (BFO-NNO) by using various experimental techniques and significant properties [33][34][35]. Keeping in the view of the above and realising the importance of rare earth impurities, an attempt has been made to synthesise Lanthanum (La) doped BFO-NNO composite.…”
The composites, (1−x)(BiFe 1-y La y O 3 )-xNaNbO 3 with x = 0.25, 0.45 and y = 0.10, 0.20, are prepared by mixed oxide method. XRD analysis shows rhombohedral (hexagonal) structure at room temperature. The properties such as dielectric loss (tanδ) and dielectric constant (ε r ) of all the samples are studied. A significant improvement in dielectric constants has been observed with the rise of Lanthanum (La) content. A dielectric anomaly above 350°C is observed for all the studied materials. Further, it is observed that ac conductivity (σ ac ) spectrum obeys universal Jonscher's power law. The variation of σ ac with inverse of temperature for all the samples is found to obey the Arrhenius equation. The formation of loop in polarisation verses electric field curve establishes the ferroelectric (FE) nature of all the studied samples. Current (I)-Electric Field (E) loops is studied to show the behaviour of domain switching.
“…8 On the other hand, the Al-doped ZnO (AZO)/NiO/AZO sandwich proves to be a heterostructure for so transparent memristors. 9 Besides this, for application in microelectronic and micro-electromechanical devices, lead free ceramics have been studied widely [10][11][12] and it is reported that (Ba 0.98 Ca 0.02 )(Ti 0.94 Sn 0.06 )O 3 -x wt% ZnO ceramics where ZnO is used as a sintering aid have attained relatively high piezoelectric results. 13 The conjunction of spin and charge states of an electron will be helpful in manufacturing low power consumption and fast processing devices.…”
“…The M″ reaches a maximum value at the relaxation frequency. The temperature dependent unsymmetrical M″ peak broadening shows the presence of a non-Debye type of relaxation behavior, which suggest spreading of relaxation with various time constant [32].Fig. 7Frequency dependent (a) real part of modulus and (b) imaginary part of modulus.…”
This paper presents the fabrication of a polycrystalline sample of the above electronic system by a mixed-oxide technique. The X-ray diffraction pattern show the evolution of perovskite phase (including some impurity phase). The rhombohedral symmetry and crystallite size of 42 nm were also found from the XRD. The distribution of grains in the microstructure suggests the formation of high density ceramics. The role of grains, grain boundaries and interface on resistive (impedance, electrical modulus and electrical transport) and insulating (dielectric) has been investigated over a wide range of frequencies (10
3
–10
6
Hz) and temperatures (25–400 °C) using spectroscopy (dielectric, modulus and impedance) techniques. The Nyquist plot illustrates the presence of effects such as grain and grain boundary over selected temperatures. Analysis of conductivity spectra reveals that the electrical transport process of the material is influenced by charge transfer by hopping. The complex modulus spectrum also describes the dielectric relaxation of the material. The study of field dependent polarization reveals the existence of ferroelectricity in the material.
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