The Effect of PbO-Nonstoichiometry on Dielectric and Semiconducting Properties of PbFe_0.5Nb_0.5O₃-Based Ceramics

Latest Designing Principle on the Microstructure and Lattice-Structure for High-Energy-Density Antiferroelectric Materials in Fast Discharging Applications

“…Compared with PDF 42-0478 (PYN), all the exceptional peaks are marked in Figure S1, enlarged and gathered in Figure g, indicating the phase structure of the secondary phase. The pattern in Figure g is highly consistent with PDF 25-0443 (Pb 3 Nb 4 O 13 ), featuring the pyrochlore phase and nonpolar symmetry. − The SEM image of the composition L4 in Figure a was also observed, showing that the smaller particles lie above the mother grains. The bright-field TEM image in Figure b further presents the cross-section topography of the mother grain and the smaller granule.…”

Dielectric and Mossbauer studies of ferroelectric and magnetic phase transitions in a-site and b-site substituted multiferroic PbFe0.5Nb0.5O3

“…2 shows the temperature dependences of the real part of permittivity ε′ for pFn ceramics and a single crystal. Electric conductivity of undoped pFn ceramics depends dramatically on the sintering temperature [5], [6], and fabrication of pFn-based ceramics with low conductivity is a difficult task [5]- [11]. because of high conductivity of the usually studied undoped pFn ceramics, the intrinsic dielectric response is obscured by the maxwellWagner relaxation and/or the relaxation related to oxygen defects [5], [11], [12] [ Fig.…”

Comparative Studies of Ferroelectric and Magnetic Phase Transitions in Pb(Fe1/2Nb1/2)O3-PbMO3(M-Ti, Zr) Multiferroic Solid Solutions

“…However, the data on the ferroelectric and magnetic phase transitions in PFN-based solid solutions are rather fragmentary and contradictory. Such scatter of data is, to a large extent, caused by a difficulty of fabrication of PFN-based ceramics with high resistivity r, because resistivity of undoped PFN ceramics depends dramatically on the sintering temperature [2,9]. On cooling, PFN undergoes a sequence of phase transitions: from the cubic paraelectric to tetragonal ferroelectric phase at T CT 370-380 K, then to the monoclinic ferroelectric phase, at T TM 350-360 K, and, finally, to the G-type antiferromagnetic (AFM) phase at T N 150 K [1][2][3][4][5][6][7].…”