Conveners
A6: Condensed Matter and Accelerators
- Attaphol Amthong (Naresuan Univeristy)
Corundum (ruby & sapphire) consists of Al$_2$O$_3$ and trace elements relating to the cause of color such as Cr, Fe, and Ti. Irradiation is one of gemstone enhancements for improving their color appearance. The aim is focused on the oxidation state of Fe ions that concern with the cause of yellow color in irradiated sapphire by XAS technique. In this study, natural sapphire samples from Sri...
Single crystals of Zn$_x$Cu$_{1-x}$V$_2$O$_7$ system with doping concentration of 0.05 and 0.15 were grown by the vertical gradient freezing technique. The crystal structures were confirmed by means of x-ray diffraction to be the beta phase of copper pyrovanadate, $\beta$-Cu$_2$V$_2$O$_7$, when the Zn concentration was as low as 0.05, on the contrary to the previous studies on polycrystal...
Ti atoms bond with Fe atoms and exchange their electron particles in the adjacent octahedral sites. This process produces the blue color on the blue sapphire. The Ti content is an important key to the alteration of the 3309 cm$^-$$^1$, 3232 cm$^-$$^1$, and 3185 cm$^-$$^1$ (3309 cm$^-$$^1$-series) peaks in infrared absorption (FTIR) spectra of blue sapphire samples. To study the effect of Fe...
Here we report the first principles study of yttrium-doped Ba(Zr$_x$Ti$_{1-x}$)O$_3$ (Y-doped BZT) for $x=0.125$, $0.250$, and $0.375$ supercells as a promising rare earth doped lead-free ferroelectric material. The local and electronic structures of Y-doped BZT and pure BZT relaxed supercells are systematically investigated in term of atomic pair distribution functions (PDFs), A and B site...
Relativistic femtosecond electron bunches can be produced from the electron linear accelerator (linac) system at the Plasma and Beam Physics (PBP) Research Facility, Chiang Mai University (CMU). A thermionic radio-frequency (RF) electron gun is used as an electron source for this accelerator system. The RF gun has a 1.6-cell S-band standing-wave structure, which has two main resonant cavities...
A new novel approach to model a single-electron transistor for the stability analysis was shown analytically. The electrostatic energy of the SET was investigated to obtain the condition of the state transition. With its simplicity, the tunneling conditions were analytically solved, and hence the stability diagram was plotted to show the stable regions and the state-transition boundary. The...
The most of superconductors are highly anisotropic superconductors, then the measurement on superfluid density propertied of superconductors are complicated that they are dependent on direction of measurement. In this study, the superfluid density of anisotropic superconductors was studied by semiclassical approach. We interested in the spin-singlet superconductors state with anisotropic...
