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Abstract
Detailed study of the X-ray diffuse scattering in the paraelectric phase of the PbZr0.985Ti0.015O3 was carried out. We concentrated on the analysis of the scattering peculiarities in the vicinities of M- and R- points of the Brillouin zone. We have observed a critical increase of the diffuse scattering at the position Q ≈ (0.47 + h 0.53 + k l) slightly aside of M point on cooling to the intermediate phase. We attribute observed critical scattering to a mixed mode containing both oxygen octahedral tilts and antiparallel cationic displacements. Tentative conclusion is made describing earlier reported complicated set of the satellite peaks around M-point as the result of the soft-mode driven incommensurate phase transition.
Additional information
Funding
Filimonov A.V. and Andronikova D.A. acknowledge the support of Russian Foundation for Basic Research (Grant No.16-52-48016 and 17-02-00774). Andronikova D.A. also acknowledges the support of the Russian President Scholarship No. SP-3762.2018.5. Bronwald Iu.A. acknowledges the support of the Ministry of Science and Education of the Russian Federation, project no. 3.1150.2017/4.6.