resumo
In this work, we demonstrate an approach of local mechanical polishing processing to modify the type of intrinsic piezoelectric activity of ?-glycine polymorph grown in a form of a single crystal. By using the piezoresponse force microscopy, the increase in intensity for both out-of-plane (3 times) and in-plane (5 times) piezoelectric tensor components is demonstrated. Application of local switching spectroscopy reveals the piezoelectric behavior of non-polished and the ferroelectric behavior of polished areas being related to the local mechanical polishing-assistant rearrangement of NH (3+ ) tails of zwitterions in polymorph molecular chain of ?-glycine. These rearrangements were demonstrated to facilitate the switching behavior of the local dipole moment at the applied electric field surpassing the internal coercive field of about Ec & SIM; 3 G V /m .
palavras-chave
BETA-GLYCINE; SURFACES
categoria
Physics
autores
Ivanov, M; Buryakov, A; Khusyainov, D; Silibin, M; Vilarinho, PM; Paixao, JA
nossos autores
Maxim Ivanov
Investigador Júnior
Paula Maria Lousada Silveirinha Vilarinho
Vice-DiretorProjectos
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
agradecimentos
The reported study was supported by the RSF (Grant No 20-79-10223) and was developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020, UIDP/50011/2020 & amp; LA/P/0006/2020, financed by national funds through the FCT/MEC (PIDDAC). Access to the TAIL-UC facility funded under QREN-Mais Centro project ICT_2009_02_012_1890 and to the equipment of the Joint Core Facilities Center RTU MIREA is gratefully acknowledged. The authors thank Assist. Prof. E. Seyedhosseini at Durham University.