resumo
The evolution of crystal structure and piezoelectric properties of the Bi1-xSmxFeO3 ceramics with compositions corresponding to the phase boundary region between the polar rhombohedral and anti-polar orthorhombic phases have been studied. The materials have been investigated using X-ray diffraction, transmission electron microscopy and piezoresponse force microscopy techniques. The diffraction measurements have allowed studying the crystal structure transformations depending on the dopant concentration and temperature. Similar to the compounds with x > 0.18, the lightly-doped samples have been found to adopt the non-polar orthorhombic structure at elevated temperatures. The research has clarified the correlation between the structural state and piezoelectric behavior. Substantial increase in piezoresponse observed for the phase-separated compounds having a dominant fraction of the rhombohedral phase has been discussed assuming significant extrinsic contribution associated with a metastable structural state changing under external electric field.
palavras-chave
MAGNETIC-STRUCTURES; CRYSTAL-STRUCTURE; SINGLE-PHASE; TRANSITIONS; TEMPERATURE; COEXISTENCE; BEHAVIOR; STATE
categoria
Materials Science
autores
Karpinsky, DV; Troyanchuk, IO; Trukhanov, AV; Willinger, M; Khomchenko, VA; Kholkin, AL; Sikolenko, V; Maniecki, T; Maniukiewicz, W; Dubkov, SV; Silibin, MV
nossos autores
Andrei Kholkin
Investigador Jubilado
Dzmitry Karpinski (Karpinsky)
Bolseiro de pós-Doutoramentoagradecimentos
This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 778070 - TransFerr - H2020-MSCA-RISE-2017. The authors are also grateful to FCT (projects IF/00819/2014/CP1223/CT0011 and UID/FIS/04564/2016), RFFI (#17-58-45026) and MK-1720.2017.8. Dr. F. Girgsdies and Dr. X. Huang are acknowledged for the X-ray diffraction and TEM measurements, respectively.