H. C. Yu

Effect of Ti doping on the electrical transport and magnetic properties of layered compound Na0.8CoO2 (2005)

Zhang, W. Y., Zhao, Y. G., Guo, Z. P., Qiao, P. T., Cui, L., Luo, L. B., ...

Effect of Ti doping on the electrical transport and magnetic properties of layered Na0.8Co1-xTixO2 compounds has been investigated. The lattice parameters a and c increase with x. A minor amount of...

Structural Phase Transitions and Sodium Ordering in Na0.5CoO2: a Combined Electron Diffraction and Raman Spectroscopy Study (2004)

Yang, H. X., Nie, C. J., Shi, Y. G., Yu, H. C., Ding, S., Liu, Y. L., ...

The nonstoichiometric NaxCoO2 system exhibits extraordinary physical properties that correlate with temperature and Na concentration in its layered lattice without evident long-range structure...

Phase separation, effects of magnetic field and high pressure on charge ordering in y-Na0.5CoO2 (2004)

Yang, H. X., Shi, Y. G., Nie, C. J., Wu, D., Yang, L. X., Dong, C., ...

Transmission electron microscopy observations reveal the presence of complex superstructures and remarkable phase separation in association with Na-ordering phenomenon in y-Na0.5CoO2. Resistivity and...

Off-axis electron holography and microstructure of Ba0.5Sr0.5TiO3 thin film grown on LaAlO3 (2004)

Tian, H. F., Yu, H. C., Zhu, X. H., Wang, Y. G., Zheng, D. N., Yang, H. X., ...

Epitaxial Ba0.5Sr0.5TiO3 thin films grown on the (001) LaAlO3 substrates with the ferroelectric transition of about 250K have been investigated by TEM and off-axis electron holography....

Superstructure, sodium ordering and antiferromagnetism in NaxCoO2 (0.75 (2004)

Shi, Y. G., Yu, H. C., Nie, C. J., Li, J. Q.

Transmission-electron-microscopy investigation reveals the presence of a superstructure with a doubled period of 2d110 in the NaxCoO2 materials for x ranging from 0.75 to 1.0. Systematic analyses...

Effects of Mn-substitution for Co on the structure and physical properties of NayCoO2 (2003)

Zhang, W. Y., Yu, H. C., Zhao, Y. G., Zhang, X. P., Shi, Y. G., Cheng, Z. H., ...

Structure, transport and magnetic properties have been investigated for layered NaCo1-xMnxO2 materials. With the increase of Mn-doping amount, measurements of x-ray diffraction indicate that the...

Structure and physical properties of NaxCoO2.yH2O superconducting system (2003)

Shi, Y. G., Li, J. Q., Yu, H. C., Zhou, Y. Q., Zhang, H. R., Dong, C.

The structural properties of NaxCoO2 and NaxCoO2yH2O have been investigated. The NaxCoO2yH2O samples in general show up the superconducting transitions at around 3.5K. EDAX analyses suggest our...

Integration of dobutamine echocardiography interpretation with tissue doppler: Effect on the accuracy of novice, experienced and expert interpreters (2001)

Fathi, R. B., Cain, P. A., Nakatani, S., Yu, H.C., Marwick, T. H.