Abstract
A study of single phase hexagonal fluorapatite crystals from Durango (Mexico), by means of the TSDC technique, has demonstrated a variety of dielectric relaxation mechanisms for different poling orientations, parallel and perpendicular to the crystallographic c-axis. In the first case, the TSDC spectrum consists of a broad complex current band, featuring a distribution of the pertinent energy barriers. In the case of perpendicular electric stimulus (E p ⊥ c) the overall intensity of the relaxation spectrum is reduced by at least one order of magnitude, compared to that with E p ∥ c axis, with at least five highly overlapping dielectric bands. A tentative attribution of the anisotropic polarizability observed in the two different orientations to specific micromolecular mechanisms takes into account the creation and selective partitioning of several microstructural defects (e.g. limited Cl− and REE3+ substitution for F− and Ca2+ respectively, ionic vacancies and dislocations). These types of defects produced several kinds of (re)orientable dipolar units and permit short range motions of electric charges, which are both directly detectable by dielectric relaxation spectroscopy methods.
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