Regular MgO nanoflowers and their enhanced dielectric responses

Regular MgO nanoflowers were synthesized via a simple chemical route. The as-synthesized nanoflowers are single crystalline and consist of MgO nanofibers which have lengths up to several micrometers and diameters in the range of 20-80 nm, with an average of 50 nm. The frequency spectra of the relative dielectric constant and the dielectric loss were measured in the frequency range of 50 Hz to 5 MHz. Temperature spectra of the relative dielectric constant were also measured and the experimental results showed that MgO nanoflowers have a much higher relative dielectric constant as compared with MgO micropowders, especially at low frequencies at room temperature. (c) 2006 American Institute of Physics.