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Magnetic properties and spin state transfer in Ga doping perovskite cobaltites La0.7Ca0.3(Co1-yGay)O3 (y=0, 0.1, 0.2, 0.3, and 0.4) are carefully investigated in this work. On Ga doping, the Curie temperature sharply decreases and the magnetization is greatly reduced, indicating Ga doping breaks the ferromagnetic interaction in the system. For y≥0.2, the ferromagnetic and antiferromagnetic transitions have been observed in thermal magnetization measurement whereas the dominated antiferromagnetic interaction is confirmed by the negative Curie–Weiss temperatures. Evaluation of the effective moment of Co ions seems to imply that Ga doping stablizes Co-ion high spin state. [ABSTRACT FROM AUTHOR]

Magnetic properties and spin state transfer in Ga doping perovskite cobaltites La0.7Ca0.3(Co1-yGay)O3 (y=0, 0.1, 0.2, 0.3, and 0.4) are carefully investigated in this work. On Ga doping, the Curie temperature sharply decreases and the magnetization is greatly reduced, indicating Ga doping breaks the ferromagnetic interaction in the system. For y≥0.2, the ferromagnetic and antiferromagnetic transitions have been observed in thermal magnetization measurement whereas the dominated antiferromagnetic interaction is confirmed by the negative Curie–Weiss temperatures. Evaluation of the effective moment of Co ions seems to imply that Ga doping stablizes Co-ion high spin state. [ABSTRACT FROM AUTHOR]

Magnetic properties and spin state transfer in Ga doping perovskite cobalities [La.sub.0.7][Ca.sub.0.3]([Co.sub.1-y][Ga.sub.y])[O.sub.3] are examined. The analysis of the effective moment of Co ions has implied that Ga doping has stabilized Co-ion high spin state.

We report a first-principles calculation to investigate the structural instability of rutile TiO2. The high pressure structural parameters are well reproduced. The calculated phonon dispersion curves agree with experiments at zero pressure. Under compression, we capture a large softening around Γ point, which indicates the structural instability. From the high pressure elastic constants, we find that the rutile TiO2 is unstable when the applied pressure is larger than 17.7 GPa. Within the quasi-harmonic approximation, the thermal equation of state, thermal expansion coefficient, bulk modulus, and entropy are well reproduced. The thermal properties confirm the available experimental data and are extended to a wider pressure and temperature range. [ABSTRACT FROM AUTHOR]

Indium-doped ZnO (ZnO:In) films are deposited on quartz substrates by rf magnetron sputtering. The effects of post-annealing on structural, electrical, optical and Raman properties are investigated by x-ray diffraction, Raman scattering, Hall measurement and first-principles calculation. The results indicate that all of the ZnO:In films have excellent crystallinity with a preferred ZnO (002) orientation. It is found that the incorporation of In can dramatically increase the intensity of the 274 cm−1 Raman mode. However, both post-annealing treatment and increasing O2 partial pressure in the process of preparing thin films can reduce the intensity of the 274 cm−1 mode or even eliminate it, and relax compressive stress of the ZnO:In film judged by analyzing the shifts of the (002) Bragg peaks and E2 (high) mode. Finally, the origin of the 274 cm−1 mode is inferred to be the vibration of Zn interstitial (Zni) defects, which play a crucial role in the high electron concentration and low resistivity of ZnO:In films annealed in an appropriate temperature range (450–600°C). [ABSTRACT FROM AUTHOR]

Provides information on a computer software for evaluating the validity of traditional Chinese medicine (TCM) prescriptions developed by researchers at the National University of Singapore. Factors that influence the formulation of TCM prescriptions; Use of artificial intelligence in software development; Percentage of the accuracy of the prescription validation process.