Poster Sessions C676 appear at 1416 and 1609 cm -1 characteristic respectively to symmetric and anti-symmetric vibration of COO-of tartaric acid. The intensity of COO-bands increases as function of acid concentration in solution and with zinc content, implying the formation of calcium and zinc tartarate on the hydroxyapatite surface. The NMR-MAS 13 C spectra of hydroxyapatite treated present two peaks at 74 and 181ppm characteristic of two different carbons of tartaric acid. The formation of new hybrid coumpounds was confirmed by the shift of signals comparing with those of free tartaric acid. Moreover, the broadening of these peaks can be explained by the heterogeneity of carbon environment by the presence of zinc on the apatitic surface.[ . R is a 3 3 × non-symmetric matrix consisting of rational numbers. Therefore, eq. (1) cannot be solved directly. Santoro et al (1980) [1] suggested to vary the elements of R systematically in the range (5, -5) until the equality sign in eq. (1) is fulfilled within chosen error limits.We suggest a different procedure: First, the three shortest noncoplanar vectors that have the same Q values in both lattices A and B are identified. These vectors are taken to define a new basis common to A and B. Then, 3 3 × matrices M A and M B are written which transform the axial systems of A and B into the new one. If the new axial system reproduces lattices A and B, then the equality(2) defines a new metric tensor common to both lattices A and B which we thus term the common metric tensor * C G .The coordinates of the reciprocal lattice points of A and B are transformed according to . Coincident lattice points yield . If all lattice points coincide, lattices A and B are termed equivalent; if only a subset of points is coincident, the lattices are semi-equivalent; otherwise they are non-equivalent.Equation (1) can be easily retrieved from equation (2):Thereby we arrive at a solution to eq. (1) that avoids trial and error methods.We take as an example two different indexing solutions A and B to CrPO 4 .6H 2 O, given by Santoro et al. (1980) [1], to demonstrate the spatial relationship of the respective reciprocal lattice points. Fig. 1 shows that lattice points A and B coincide. However, solution A only explains a subset of points. Polyaniline (PANI) and derivatives of aniline have received great attention due to their technological applications. The introduction of polar functional groups and alkyl groups to the main chain of PANI is a practice to obtain soluble polymers in a wider variety of organic solvents. Poly(o-methoxyaniline) (POMA) is a derivative of PANI and its structural difference is the presence of the group (-OCH 3 ) in the ortho position of the carbon rings, been extensively studied in the form of powder or films for the most various applications. ES-PANI and ES-POMA were synthesized, respectively, according to the method described elsewhere [1,2] with times of synthesis ranging from 0,5 to 96 h. Samples were characterized by XRD, SAXS, LeBail Fit [3], SEM and van der Pauw ...