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• W1519038030 abstract "Studies on direct current (dc) and alternating current (ac) electrical conductivity in ferroelectric ceramics [Pb(Fe1/3Sb2/3)xTiyZrz]O3 with x + y + z = 1, x = 1 and y = 0.44 and 0.47 have been performed. The measurements were carried out in the temperature range 77–750 K and frequencies 50 Hz–100 kHz. AC conductivity σ(ω) fulfills the relation σ(ω) = AωS, where the exponent s depends on temperature T and frequency ω. The exponent s increases with decreasing temperature and in vicinity of 77 K is equal to 0.988 and 0.991 for samples with y = 0.44 and y = 0.47, respectively. At low temperature, the temperature dependence of dc conduction σ(0) is described by Mott's law σ(0)∝ exp[-(T0/T)1/4]. T0 calculated from that relation equals 4.51 × 106 and 2.2 × 106 K for samples y = 0.47 and y = 0.44, respectively. Knowing T0 and estimating the spatial extend of localized wave function as α−1 = 2.2Å, the density of states at Fermi level N(EF) was calculated as 2.7 × 1022 cm−3 eV−1 (y = 0.44) and 2.54 × 1022 cm−3 eV−1 (y = 0.47). The most probable Mott hopping distance R and hopping energy W were determined. At 300 K R = 19.4 Å, W = 0.058 eV for sample with y = 0.47 and R = 18.2 Å, W = 0.071 eV for sample with y = 0.44. Density of states at the Fermi level calculated from dc and ac conductivities are of the same order of magnitude." @default.
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• W1519038030 date "2011-01-01" @default.
• W1519038030 modified "2023-09-26" @default.
• W1519038030 title "Hopping Electrical Conductivity in Ferroelectric Pb[(Fe_1/3Sb_2/3)_xTi_yZr_z]O₃" @default.
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• W1519038030 doi "https://doi.org/10.1080/00150193.2011.578920" @default.
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