Spontaneous polarization, dielectric constant, D.C. resistivity, and specific heat of orthorhombic boracite Fe3B7O13I

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Abstract
Several properties of ferroelectric orthorhombic Fe-I boracite have been measured; some individual values are: spontaneous polarization Ps (25°C) = 3.9 ± 0.1 × 10−2 cm−2, dielectric constant ε33 (25°C) = 11, D.C. resistivity ρ (71°C, mm2) = 1.1 × 108 Ωm. ρ (71°C, 43m) = 3 × 106 Ωm, volume specific heat Cv (25°C) = 3.5 ± 0.3 × 106 Jm−3 K−1, latent heat ΔQ = 3.1 + 0.3 × 103 Jmole−1, transition enthalpy ΔS = 8.9 ± 0.5 Jmole−1 K−1.