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Magnetic dc susceptibility between 1.5 and 800 K, ac susceptibility andmagnetization, thermodynamic properties, temperature dependence of radio andaudio-wave dielectric constants and conductivity, contact-free dielectricconstants at mm-wavelengths, as well as ferroelectric polarization are reportedfor single crystalline BiFeO3. A well developed anomaly in the magneticsusceptibility signals the onset of antiferromagnetic order close to 635 K.Beside this anomaly no further indications of phase or glass transitions areindicated in the magnetic dc and ac susceptibilities down to the lowesttemperatures. The heat capacity has been measured from 2 K up to roomtemperature and significant contributions from magnon excitations have beendetected. From the low-temperature heat capacity an anisotropy gap of themagnon modes of the order of 6 meV has been determined. The dielectricconstants measured in standard two-point configuration are dominated byMaxwell-Wagner like effects for temperatures T > 300 K and frequencies below 1MHz. At lower temperatures the temperature dependence of the dielectricconstant and loss reveals no anomalies outside the experimental errors,indicating neither phase transitions nor strong spin phonon coupling. Thetemperature dependence of the dielectric constant was measured contact free atmicrowave frequencies. At room temperature the dielectric constant has anintrinsic value of 53. The loss is substantial and strongly frequency dependentindicating the predominance of hopping conductivity. Finally, in small thinsamples we were able to measure the ferroelectric polarization between 10 and200 K. The saturation polarization is of the order of 40 microC/cm^2,comparable to reports in literature.

On the room temperature multiferroic BiFeO3: Magnetic, dielectric and thermal properties