・名古屋工業大学学術機関リポジトリは、名古屋工業大学内で生産された学術情報を電子的に収集・保存・発信するシステムです。 ・論文の著作権は、著者または出版社が保持しています。著作権法で定める権利制限規定を超える利用については、著作権者に許諾を得てください。 ・著者版フラグに「author」と記載された論文は、著者原稿となります。実際の出版社版とは、レイアウト、字句校正レベルの異同がある場合もあります。 ・Nagoya Institute of Technology Repository Sytem is built to collect, archive and offer electronically the academic information produced by Nagoya Institute of Technology. ・The copyright and related rights of the article are held by authors or publishers. The copyright owners' consents must be required to use it over the curtailment of copyrights. ・Textversion "Author " means the article is author's version. Author version may have some difference in layouts and wordings form publisher version.
Structures of (Ca_<2-x/2>□_<x/2>) (Si_<1-x>P_x)O_4 crystals were examined as a function of x ranging from 0.03 to 0.40. All of the samples were heated at the stable temperature region of the α-phase and then quenched in water. The phase constitution at ambient temperature was classified into three categories according to the fraction of the α-to-α´_H transition. When the transition was completed as in the crystals with x?0.100, the β- and α´_L-phases were obtained, the relative amounts of which were determined by the start and finish temperatures of the α´_L-to-β martensitic transformation. With 0.125?x?0.150, the α-to-α´_H transition was incomplete. During further cooling, the product α´_H-Phase was inverted to the α´_L-Phase, and the residual α-phase was inverted to the incommensurate phase successively. Because the start temperature of the α´_L-to-β transformation was lower than ambient temperature, the α´_L-Phase was stabilized. With x?0.175, all of the crystals were free from the α-to-α´_H transition. The crystals with 0.175?x?0.225 were made up exclusively of the incommensurate phase. A good correlation existed between the modulation wavelength (=N) and the P/ (Si+P) ratio (=x) as N=4.134-1.56x (0.175?x?0.250). With 0.275?x?0.300, the crystals were isostructural with α-Ca_2SiO_4. The hexagonal phase with 0.350?x?0.400, probably a transition product from the α-phase, showed two-dimensional modulations along the α-axis with N=2 and along the c-axis with N=3.
Structural Change in Phosphorus-Bearing Dicalcium Silicates
本文_fulltext
(1.86MB)
