New layered perovskite compounds, Sr=+lV=OS=+l (n=l, 2 and 3) and SrVOs(n=oo ) , were synthesized and the physical properties of the compounds with n=l, 2 and 00 were investigated. Sr2V0 4 was semi conductive and antiferromagnetic, but a weak ferromagnetic contribution to the susceptibility was observed below 45 K. However, SrSV20 7 exhibited a metallic electrical conduction and a Pauli-paramagnetism. SrLaV0 4 was also successfully synthesized and was found to be semiconductive. The crystal structures and electrical and magnetic properties of Sr=+lV=OS=+l (n=l, 2, 3 and 00 ) and SrLaV04 were com pared.
We investigated the critical current density and the flux creep in melt-processed Bi-Pb-Sr-Ca-Cu-O for the purpose of studying the existence of strong flux pinning forces due to normal conducting precipitates. We fabricated samples with a similar microstructure to melt-processed Y-Ba-Cu-O and Tl-Sr-Ca-Cu-O having a strong pinning force. When the matrix was (Bi, Pb) 2 Sr 2 Ca 1 Cu 2 O y (2212) phase, the irreversibility field B irr was expressed as B irr \propt(1- T / T c ) 3/2 , which suggested that the expected flux pinning was due to normal conducting precipitates. A part of the matrix was transformed to (2223) phase by the postannealing of the sample; however, the superconducting properties were inferior to those observed in (2223) polycrystals.
Journal Article Structure-Specific Effects of Thyroxine Analogs on Human Liver 3α-Hydroxysteroid Dehydrogenase Get access Tomohiro Yamamoto, Tomohiro Yamamoto *Laboratory of Biochemistry, Gifu Pharmaceutical UniversityGifu 502-8585 Search for other works by this author on: Oxford Academic PubMed Google Scholar Ayumu Nozaki, Ayumu Nozaki *Laboratory of Biochemistry, Gifu Pharmaceutical UniversityGifu 502-8585 Search for other works by this author on: Oxford Academic PubMed Google Scholar Syunichi Shintani, Syunichi Shintani *Laboratory of Biochemistry, Gifu Pharmaceutical UniversityGifu 502-8585 Search for other works by this author on: Oxford Academic PubMed Google Scholar Syuhei Ishikura, Syuhei Ishikura *Laboratory of Biochemistry, Gifu Pharmaceutical UniversityGifu 502-8585 Search for other works by this author on: Oxford Academic PubMed Google Scholar Yoshihiro Katagiri, Yoshihiro Katagiri †Department of Pharmacy, Gifu University HospitalGifu 500-8705 Search for other works by this author on: Oxford Academic PubMed Google Scholar Akira Hara Akira Hara 2 *Laboratory of Biochemistry, Gifu Pharmaceutical UniversityGifu 502-8585 2 To whom correspondence should be addressed. E-mail: hara@gifu-pu.ac.jp Search for other works by this author on: Oxford Academic PubMed Google Scholar The Journal of Biochemistry, Volume 128, Issue 1, July 2000, Pages 121–128, https://doi.org/10.1093/oxfordjournals.jbchem.a022722 Published: 01 July 2000 Article history Received: 15 March 2000 Accepted: 02 May 2000 Published: 01 July 2000
The Bi-based (2212) single grains including a large number of normal particles, (Ca,Sr)2Cu1O3, were synthesized by a melt process. To characterize the flux creep behavior in such a superconductor, magnetization measurements were performed at various temperatures and magnetic fields. The flux creep rate exhibited a maximum at 20 K in both magnetic fields parallel and normal to c axis. The magnetic field dependence of the pinning potential, U0, evaluated from the residual magnetization was not represented by the expression, B−α, in Y1Ba2Cu3O7 superconductors. The relation between U0 and the critical current density is discussed.
We have investigated the effect of Pt on crystallization of Bi 2 Sr 2 Ca 1 Cu 2 O y prepared by the melt process. By observing the microstructure of specimens rapidly cooled in the process of crystallization, we found that the Pt restrained the growth of the Ca 2 Cu 1 O 3 phase and even of superconducting phases. It was found that Pt formed oxides preferentially with Ca and Sr early in the crystallization process, however, such products didn't seem to grow coarsely.
New layered perovskite compounds ${\mathrm{Sr}}_{\mathit{n}+1}$${\mathrm{V}}_{\mathit{n}}$${\mathrm{O}}_{3\mathit{n}+1}$ (n=1, 2, and 3) and ${\mathrm{SrVO}}_{3}$ (n=\ensuremath{\infty}) were synthesized, and the physical properties of the compounds with n=1, 2, and \ensuremath{\infty} were investigated. ${\mathrm{Sr}}_{2}$${\mathrm{VO}}_{4}$ was semiconducting in its electrical properties and antiferromagnetic in its magnetic properties, while it was weakly ferromagnetic at low temperatures below 45 K. On the other hand, ${\mathrm{Sr}}_{3}$${\mathrm{V}}_{2}$${\mathrm{O}}_{7}$ exhibited metallic behavior in its electrical conduction and a Pauli paramagnetism that was superimposed with a weak Curie-Weiss-type magnetism. The crystal structures and electrical and magnetic properties of ${\mathrm{Sr}}_{\mathit{n}+1}$${\mathrm{V}}_{\mathit{n}}$${\mathrm{O}}_{3\mathit{n}+1}$ (n=1, 2, and 3) and ${\mathrm{SrVO}}_{3}$ were compared.
Polycrystalline samples of ${\mathrm{Sr}}_{\mathit{x}}$${\mathrm{NbO}}_{3}$ (0.75\ensuremath{\le}x\ensuremath{\le}0.90) have been successfully synthesized by a solid-state reaction technique using TiO as a reducing agent. Powder x-ray-diffraction analysis indicated that the samples with x\ensuremath{\ge}0.80 were single phase of the cubic perovskite structure. Electrical resistivity of each sample exhibited metallic behavior at temperatures below 300 K. For the samples with x0.90, the magnetic susceptibility was nearly temperature independent (Pauli paramagnetic), while the sample with x=0.90 showed a Curie-Weiss behavior. Since the thermoelectric power coefficient (S) was found to be negative for all the samples in the temperature range between 10 and 300 K, the dominant charge carriers in ${\mathrm{Sr}}_{\mathit{x}}$${\mathrm{NbO}}_{3}$ (0.75\ensuremath{\le}x\ensuremath{\le}0.90) were thought to be electrons. On the contrary, the nonlinear temperature dependence of S indicated that electrons in ${\mathrm{Sr}}_{\mathit{x}}$${\mathrm{NbO}}_{3}$ were not simply metallic but rather similar to those in amorphous metals.
The temperature dependence of electrical resistivity of Nd1.85Ce0.15CuO4−y was measured with oxygen partial pressure fixed at 2.08×10−1, 1.8×10−2, 8.1×10−4, and 3.3×10−6 atm. The oxygen partial pressure dependence of resistivity indicated that the charge carriers in Nd1.85Ce0.15CuO4−y were electrons. The temperature dependence of resistivity exhibited a linear metallic behavior at high temperatures and a semiconductorlike behavior at low temperatures, having a minimum at an intermediate temperature. Difficulties are pointed out in obtaining a unified view for the mechanism of normal electrical conduction in Nd1.85Ce0.15CuO4−y .
