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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.
Loudness and Perception of sound
Toshio Sone,Yoiti Suzuki The Acoustical Society of Korea 1989 韓國音響學會誌 Vol.8 No.5
This paper presents basic data on loudness level and loudness along with data obtained by the authors, and describes an application of the idea of masked loudness to perception of music in the presence of noise. It is shown that timbre or sound quality of music is well explained by masked loudness vs frequency characteristic.
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