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Tin Doping Mechanism in Indium Oxide by MD Simulation
Utsuno, Futoshi,Yamada, Naoomi,Kamei, Masayuki,Yasui, Itaru The Korean Ceramic Society 1999 The Korean journal of ceramics Vol.5 No.1
In order to investigate Sn substitution sites and interstitial O atoms in tin-doped indium oxide, molecular dynamics (MD) simulations were carried out. There are two kinds of cation sites in $In_2O_3$, namely b-site and d-site. NTP-MD simulations under the condition of 300 K and 0 GPa were performed with two kinds of cells substituted by Sn atoms at each site. The excess oxygen atom accompanied with Sn doping was also taken into consideration. According to the calculations of Sn potential energies in each site, it was revealed that Sn atoms were substituted for b-sites rather than for d-sites. It was also revealed that the interstitial excess oxygen atoms tend to be connected with the Sn atoms substituted for the d-sites Sn rather than for the b-site. There MD simulation results well agreed with the experimental results.
New Glass Ceramics for Hard Disk Substrates with Improved Surface Flatness
Utsuno, Futoshi,Yamada, Yusuke,Takeya, Huminori,Yasui, Itaru The Korean Ceramic Society 1999 The Korean journal of ceramics Vol.5 No.4
New glass ceramics were investigated for the application as substrates to be used in hard disk devices. The glass system to precipitate lithium di-silicate was studied so as to optimize the composition to realize very high surface flatness. The addition of small amount of several metal oxides with high valences had very drastic effects on the microstructure, because they played a role of crystallization agents, and consequently it determined surface flatness even after the polishing process. The possible mechanism changes of crystal growth due to the addition of metal oxides were discussed in relation to the final micro-texture development. The glass ceramics with very high surface flatness(Ra=7.1 $\AA$) was obtained by the addition of the mixture of $P-2O_5 \;and \;MoO_3$ as crystallization agents.
Quasifree Neutron Knockout from Ca54 Corroborates Arising N=34 Neutron Magic Number
Chen, S.,Lee, J.,Doornenbal, P.,Obertelli, A.,Barbieri, C.,Chazono, Y.,Navrá,til, P.,Ogata, K.,Otsuka, T.,Raimondi, F.,Somà,, V.,Utsuno, Y.,Yoshida, K.,Baba, H.,Browne, F.,Calvet, D.,Ch&ac American Physical Society 2019 Physical Review Letters Vol.123 No.14