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Tochigi, Katsumi,Uchiyama, Masanori,Kojima, Kazuo 한국화학공학회 2000 Korean Journal of Chemical Engineering Vol.17 No.5
Infinite-dilution activity coefficients of n-alcohols (C₁-C_8) in water were measured by using the relative gas-liquid chromatographic method proposed by Orbey and Sandier [1991]. The temperature range of measurement was 298 to 343 K. The γ^∞values at 298.15 K varied from 1.72 (methanol) to 1970 (n-heptanol). ASOG, UNIFAC, modified UMFAC (Dortmund), modified UNIFAC (Lyngby) group contribution methods could predict γ^∞ to within 16.9, 28.8, 23.9 and 31.8 average percent error, respectively, for all systems and temperatures.
Assessment of Strain-Generated Oxygen Vacancies Using SrTiO<sub>3</sub> Bicrystals
Choi, Si-Young,Kim, Sung-Dae,Choi, Minseok,Lee, Hak-Sung,Ryu, Jungho,Shibata, Naoya,Mizoguchi, Teruyasu,Tochigi, Eita,Yamamoto, Takahisa,Kang, Suk-Joong L.,Ikuhara, Yuichi American Chemical Society 2015 NANO LETTERS Vol.15 No.6
<P>Atomic-scale defects strongly influence the electrical and optical properties of materials, and their impact can be more pronounced in localized dimensions. Here, we directly demonstrate that strain triggers the formation of oxygen vacancies in complex oxides by examining the tilt boundary of SrTiO<SUB>3</SUB> bicrystals. Through transmission electron microscopy and electron energy loss spectroscopy, we identify strains along the tilt boundary and oxygen vacancies in the strain-imposed regions between dislocation cores. First-principles calculations support that strains, irrespective of their type or sign, lower the formation energy of oxygen vacancies, thereby enhancing vacancy formation. Finally, current–voltage measurements confirm that such oxygen vacancies at the strained boundary result in a decrease of the nonlinearity of the <I>I</I>–<I>V</I> curve as well as the resistivity. Our results strongly indicate that oxygen vacancies are preferentially formed and are segregated at the regions where strains accumulate, such as heterogeneous interfaces and grain boundaries.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2015/nalefd.2015.15.issue-6/acs.nanolett.5b01245/production/images/medium/nl-2015-01245s_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl5b01245'>ACS Electronic Supporting Info</A></P>