Abstract
A nanocomposite of porous glass and aNaNO2 ferroelectric(channels of ∼7 nm diameter) was studied using infrared reflectivity, THz transmission and Ramanspectroscopy as a function of temperature in the range of 300–500 K, including the ferroelectrictransition. From the infrared and THz response the effective dielectric function was calculatedand compared with the dielectric functions calculated from the Bruggeman and Lichteneckermodels of the effective medium, using the known data on the polar phonon modes of theNaNO2 single crystals. The results show good qualitative agreement, indicating that the stiffening ofthe effective modes is due to local depolarization fields on the glass–ferroelectric interfaces.The nonpolar Raman modes show no substantial modification compared to those of the bulkNaNO2. Some signatures of the ferroelectric transition were even seen. The results indicate thatthe intrinsic size effect (phonon confinement) is negligible in this nanocomposite.
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