The year 2012 is the 60th anniversary of the discoveries of the piezoelectricity of bone and electrical callus, which were reported by Dr. Iwao Yasuda of our department for the first time in 1953, only 8 years after the end of World War II. The historians of the Japanese Orthopaedic Association have designated these accomplishments as ‘‘a great and proud Japanese achievement for orthopedics’’. ...

Microelectromechanical systems (MEMS) incorporating active piezoelectric layers offer integrated actuation, sensing, and transduction. The broad implementation of such active MEMS has long been constrained by the inability to integrate materials with giant piezoelectric response, such as Pb(Mg(1/3)Nb(2/3))O(3)-PbTiO(3) (PMN-PT). We synthesized high-quality PMN-PT epitaxial thin films on vicinal...

We demonstrate that the spatially modulated electric field that is associated with a photorefractive grating generates stress and strain components with symmetries that are different from those induced by a uniform electric field. Therefore, because of piezoelectricity and the elasto-optic effect, the symmetries of the effective dielectric and electro-optic constants to be used to describe the ...

Two dimensional Co 2 Se 3 nanosheet simultaneously possesses out-of-plane electric polarization, ferromagnetism, half-metallic transportation and piezoelectricity, rendering it a promising candidate for advanced multiferroic applications.

We study the elastic behavior and rupture mechanism of Calcium Silicate Hydrates (C-S-H) in response to tensile loading. For three axes, initial defects are spotted interlayer regions. However, crack propagation is rather different depending on axis tensile. The cup-and-cone failure surface shows ductile feature C-S-H x y directions; while devastating mode confirms brittle z direction. Piezoele...

We present a systematic analysis of the eigenvalue problem associated with free vibrations of a finite piezoelectric body. The analysis is based on an abstract formulation of the three-dimensional theory of piezoelectricity. A series of fundamental properties of free vibrations of a piezoelectric body are proved concisely. The problem of free vibrations of a piezoelectric plate governed by the ...

In this work, piezoelectricity of individual ZnO nanobelts grown along the [0 1 ı̄ 0] direction is studied using piezoresponse force microscopy (PFM). It is found that the effective piezoelectric coefficient of these NBs, deff 33 , is increasing from 2.7 pm/V at 30 kHz to 44 pm/V at 150 kHz. The results were explained by the Debye model, where structural inhomogeneity in our NBs was shown to be ...

There has been a surge of research interest in the promising lead-free potassium?sodium niobate (KNN)-based ceramics, applications which could be significantly promoted by improving thermal stability piezoelectricity. Besides, endowing KNN-based ceramics with photoluminescence property rare-earth-ion doping can make them more completive counterparts potential such as novel multifunctional sensi...

Semiconductor GaN NWs are promising components in next generation nano- and optoelectronic systems. In addition to their direct band gap, they exhibit piezoelectricity, which renders them particularly attractive in energy harvesting applications for self-powered devices. Nanowires are often considered as one-dimensional nanostructures; however, the electromechanical coupling leads to a third ra...