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Structural and Piezoelectric Properties of (Na 1− x K x )NbO 3 Platelets and Their Application for Piezoelectric Nanogenerator
Author(s) -
Xu HaiBo,
Ko YoungJin,
Lee TaeGon,
Park SuJin,
Noh MyoungSub,
Kim BoYun,
Kim Jeong Seog,
Nahm Sahn
Publication year - 2016
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14382
Subject(s) - orthorhombic crystal system , materials science , piezoelectricity , natural bond orbital , platelet , crystallography , composite material , crystal structure , chemistry , biology , immunology , density functional theory , computational chemistry
(Na 1− x K x )NbO 3 ( NKN ) platelets synthesized at 600°C for 12 h have an Amm 2 orthorhombic structure. However, the structure of NKN platelets synthesized at 500°C is a mixture of R 3 m rhombohedral and Amm 2 orthorhombic structures. The formation of a rhombohedral structure is attributed to the presence of OH − and H 2 O defects in the NKN platelets. The piezoelectric strain constant ( d 33 ) of NKN platelets synthesized at 600°C for 12 h is 100 pmV −1 , whereas that of NKN platelets synthesized at 500°C is lesser (50 pmV −1 ) due to the presence of these defects. Piezoelectric nanogenerators ( PNG s) are fabricated using composites consisting of NKN platelets and polydimethylsiloxane. A large output voltage of 25 V and output current of 2.7 μA were obtained for the PNG with NKN platelets synthesized at 600°C for 6 h. This PNG shows a high output electrical energy of 3.0 μW at an external load of 5.1 MΩ.