X-ray diffraction (XRD), dielectric constant (e 0), dielectric loss factor (e 00), and ac conductivity (r ac) of pure and LaCl 3-doped polyvinylidene fluoride (PVDF) have been carried out. The dielectric properties have been studied in the temperature and frequency ranges; 140-450 K and 0.1À1000 kHz, respectively. XRD results reveal that pure and LaCl 3-PVDF samples are in the a-phase. The incorporation of La 3þ ions within the PVDF polymer matrix forms complexes which reduce the order structure of PVDF. Three relaxation processes, namely; q, a a , and a c were observed for pure PVDF. The first relaxation can be explained based on space charge formation or Maxwell-Wagner polarization. The second one occurs around the glass transition temperature, T g , and is related to the micro-Brownian motion of the main polymer chain. It becomes broad and shifted to higher temperatures with the doping of LaCl 3. The third process appears below the melting temperature of PVDF and can be attributed to molecular motions of the main polymer chain. The behavior of the ac conductivity shows that the conduction mechanism of pure, 5 wt. % and 10 wt. % of LaCl 3-doped PVDF samples is follows the correlated barrier hopping (CBH) model, while 3 wt. % of LaCl 3-doped PVDF exhibits a small polaron tunneling (SPT) conduction. V

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