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Fujinomiya, Japan

Tsurekawa S.,Kumamoto University | Hatao H.,Kumamoto University | Takahashi H.,Fuji Ceramics Corporation | Morizono Y.,Kumamoto University
Japanese Journal of Applied Physics | Year: 2011

Piezoelectric materials should have stable performance during electric cycling in service. Because piezoelectricity-related properties depend on the ferroelectric domain structure, it is essential to investigate the fatigue characteristics of domain structures under electric loading. Piezoresponse force microscopy (PFM) was used to observe changes in ferroelectric domain structure with cyclic electric loading in MnO2-doped Li0.06(Na 0.5K0.5)0.94NbO3 (LNKN) ceramics. The PFM observations revealed that polarization loss occurred owing to electric fatigue, and that domain width and length fraction of 180° domain walls increased with increasing number of cycles. The decreases in the piezoelectric constant d33 and the electromechanical coupling coefficient k p observed owing to electric fatigue are compared with fatigue of the domain structure. © 2011 The Japan Society of Applied Physics. Source


Takahashi H.,Fuji Ceramics Corporation
IEEJ Transactions on Electronics, Information and Systems | Year: 2011

Due to recent environment issues, many research findings on non-lead based materials have been disclosed. The author also reported the possibility of improvements piezoelectric materials by microwave (MW) sintering. We checked relationships between domain size and piezoelectric constant d33 in BaTiO3 ceramics, and grain boundary and domain properties of ceramics, which are reported herein. © 2011 The Institute of Electrical Engineers of Japan. Source


Takahashi H.,Fuji Ceramics Corporation
Electronics and Communications in Japan | Year: 2012

Due to recent environmental issues, many research findings on non-lead-based materials have appeared. The author also reported the possibility of improvement of piezoelectric materials by microwave (MW) sintering. We checked the relationships between the domain size and piezoelectric constant d 33 in BaTiO 3 ceramics, and the grain boundary and domain properties of ceramics, which are reported herein. © 2012 Wiley Periodicals , Inc. Source


Patent
Sakai Chemical Industry Co., Fuji Ceramics Corporation and Tohoku University | Date: 2010-04-05

Disclosed are a method of producing fine particulate alkali metal niobate in a liquid phase system, wherein the size and shape of particles of the fine particulate alkali metal niobate can be controlled; and fine particulate alkali metal niobate having a controlled shape and size. Specifically disclosed are a method of producing particulate sodium-potassium niobate represented by the formula (1): Na


Patent
Sakai Chemical Industry Co., Fuji Ceramics Corporation and Tohoku University | Date: 2010-04-05

Disclosed are a method of producing fine particulate alkali metal niobate in a liquid phase system, wherein the size and shape of the particulate alkali metal niobate can be controlled; and fine particulate alkali metal niobate having a controlled shape and size. One of specifically disclosed is a method of producing a substantially rectangular cuboid particulate alkali metal niobate represented by MNbO

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