DSpace Home
→
Browsing by Author

Browsing by Author "Udomkan N."

Now showing items 1-10 of 10

Aragonite to calcite transformation studies by esr of Mn2+ ions in sinotaia ingallsiana

Udomkan N.; Limsuwan P. (2009)

We have studied paramagnetic Mn2+ ions present in the freshwater snail, Sinotaia ingallsiana (FS), Viviparus which are abundant in Thailand. The FS shells in our study were ground into fine powder. A set of seven samples ...
Effect of excess bismuth on the synthesis of bismuth silicate (Bi 4Si3O12) polycrystals

Kaewkhao J.; Udomkan N.; Chewpraditkul W.; Limsuwan P. (2009)

In this study, the effect of bismuth content on the crystal structure and morphology of bismuth silicate (BSO:Bi4Si3 O12) polycrystals were investigated with X-ray diffraction (XRD) analysis and scanning electron microscope ...
Effect of Pr and Ca doping on the superconducting properties of Dy 1-2x,Prx,Cax,Ba2Cu3O 7-δ HTSCs

Charoenthai N.; Udomkan N. (2007)

The structure changes and the suppression of superconductivity in the Dy-123 high-temperature superconductors (HTSCs) due to equal substitution of Pr and Ca are studied. The onset temperatures (Tc's) of the co-doped ...
Effect of rare-earth (RE = La, Nd, Ce and Gd) doping on the piezoelectric of PZT(52:48) ceramics

Udomkan N.; Limsuwan P.; Tunkasiri T. (2007)

The purpose of this research is to study the effect of doping some rare earth ions into PZT(52:48) ceramics. The ferroelectric Pb(ZrxTi 1-x)O3 ceramics are well-known as piezoelectric materials for electro-mechanical ...
Erratum: Effect of rare-earth (Re = La, Nd, Ce and Gd) doping on the doping piezoelectric of PZT (52:48) ceramics (International Journal of Modern Physics B (2007) 21:26 (4549-4559))

Udomkan N.; Limsuwan P.; Tunkasiri T. (2009)

[No abstract available]
ESR and optical absorption spectra of copper (II) IONS IN GLASSES

Kaewkhao J.; Rhianphumikarakit S.; Udomkan N. (2008)

Glasses in the system 20Na2O-Al2O3- 13B2O3-6.3CaO-0.2Sb2O3-1.5PbO 2-(58-x)SiO2-xCuO were prepared with x = 0.0, 0.2, 0.4, 0.6 and 0.8 mol% respectively. ESR absorption spectra due to Cu2+ (3d9) ions show that the ESR signal ...
ESR and Raman studies of chemical bath deposited CdS : Ni films

Intatha U.; Eitssayeam S.; Pengpat K.; Udomkan N.; Limsuwan P.; Tunkasiri T. (2008)

The CdS : Ni films were fabricated on glass substrates by chemical bath deposition method (CBD), where Ni concentrations are 0%, 10%, 20%, 30% and 40%. X-ray diffractometry (XRD), Raman spectroscopy and electron spin ...
ESR study of spin-Hamiltonian parameters and crystal field energy levels for the low C3 symmetry Fe3+ center in green sapphire crystals and powder

Limsuwan P.; Udomkan N.; Winotai P. (2007)

In this report, Fe3+ impurity ions present in green sapphire (Al3O3) were studied experimentally, by heating a light green sapphire in flowing oxygen atmosphere for 12 h from 1200, 1300, 1400, 1500 and 1600°C, respectively. ...
Study of ESR, defect structure and surface morphology of Cu2+ in CdS crystals

Eitssayeam S.; Tawichai N.; Pengpat K.; Tunkasiri T.; Udomkan N.; Intatha U. (2007)

Cu-doped Cadmium sulfide (CdS) films were prepared by chemical bath deposition method. Various quantities of Cu were used for mixing. Surface characterization, structure, morphology and defect structures of the films were ...
Temperature effects on freshwater snail shells: Pomacea canaliculata Lamarck as investigated by XRD, EDX, SEM and FTIR techniques

Udomkan N.; Limsuwan P. (2008)

In this study, the XRD, EDX, SEM and FTIR analyses are used for the characterization of the thermal decomposition process of Pomacea canaliculata Lamarck (PCL) samples. All these shells are abundant in Thailand. The shell ...

Now showing items 1-10 of 10

Search DSpace

Advanced Search

Browse

All of DSpace

Browsing by Author "Udomkan N."

Browsing by Author "Udomkan N."

Search DSpace

Browse

All of DSpace

My Account