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Dielectric Anomaly in the Region IV of Rochelle Salt - Ammonium Rochelle Salt Mixed Crystals
Toshio Kikuta,Noriyuki Nakatani,Ryosuke Kawabe,Toshinari Yamazaki 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
Temperature dependence of the dielectric constant along the a axis has been measured at various concentrations in the regions III and IV of mixed crystals of Rochelle salt and ammonium Rochelle salt. In the region IV, the dielectric anomaly along the a axis grows to be remarkable with the concentration of Rochelle salt, while the polar axis is still b. The free energy function which has two types of the transition parameters is constructed to consider the thermodynamic treatment in the region IV. The dielectric anomaly along the a axis in the region IV is successfully expressed by the free energy function.HC
Toshio Kikuta,Noriyuki Nakatani,Toshinari Yamazaki 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.2I
The change in the domain pattern was observed when the influence of an electric field perpendicular to the ferroelectric axis in triglycine sulfate crystals was investigated. With the charged carbon decoration method, the domain pattern turned out quite changed from a lenticular domain pattern perpendicular to the c axis into a rigid striped one parallel to the c axis. The direction of the stripe, on which the strongest influence of the perpendicular electric field has been found, seems to have a peculiar nature.
Crystal Structure of Telluric Acid Ammonium Phosphate (TAAP) in the Paraelectric Phase
Toshio Kikuta,Daisuke Hamatake,Noriyuki Nakatani,Toshinari Yamazaki 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
Crystal structure of monoclinic telluric acid ammonium phosphate (TAAP) has been studied by an X-ray diffraction method in the paraelectric phase at 333 K and in the ferroelectric phase at room temperature. It is conrmed that the space group in the paraelectric phase is P2/n. Comparison of the results between the two temperatures suggests that the plane which is made by the PO4 tetrahedron linked by hydrogen bonds has an important role for the ferroelectric phase transition. This plane is almost parallel to the direction of spontaneous polarization.
Experimental Confirmation of Propulsion and Levitation Control for Linear Induction Motor
Daichi Okamori,Shouta Nakatani,Kenta Sannomiya,Toshimitsu Morizane,Noriyuki Kimura,Hideki Omori 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Linear motors and Electro Magnetic Suspension (EMS) are used in the maglev system. Linear Induction motors (LIMs) have simple structure, flexible mechanism, and direct drive. HSST (High Speed Surface Transport) system is one of the magnetic levitation systems using LIM. In this system, the traction is controlled by LIM, and the levitation is controlled by EMS respectively. However, this systems have problems, for example the attractive force generated from LIM disturbs the levitation control of the EMS. We have proposed a new magnetic levitation system without EMS. In this system, the attractive force generated from LIM is used as the levitation force. We have also proposed a new control method of the thrust force and attractive force independently and simultaneously. It uses two frequency components. In this paper, we verify the control performance of propulsion and levitation by the experiments.
Internal Bias Field in Glycine Phosphite Crystal
Jannatul Nayeem,Toshio Kikuta,Hiroshi Wakabayashi,Noriyuki Nakatani,Toshinari Yamazaki 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
The distributions of internal bias eld Eb have been investigated under the carbon-powder pattern and mercury electrode techniques in GPI ferroelectric crystals. Polarity and intensity of Eb are distributed depending on crystal growth sectors. Crystal symmetry 2/m is observed obviously in the distribution of Eb. The polarities of Eb are head-to-head manner in those growth sectors where a surface is growing parallel to the crystallographic a-axis and tail-to-tail manner in the other growth sectors in the crystal. The maximum intensity of Eb is found in the sectors f010g where the growing surfaces are perpendicular to the ferroelectric b-axis.