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This study revealed the influence of crystallisation processes on the homogeneity of the sol-gel PbZr 0?52 Ti 0?48 O 3 thin films, allowing identification and further optimisation of thin film performance. Crystallisation processes determine the optical gradient appearance, irrespective of the chemical solvents used in this work. X-ray diffraction analysis showed that a refractive index gradient was apparent in the samples which had dominant (001)/(100) orientation and significant change of lattice parameters with thickness.

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