2002, Vol.12, No.1

Journal of the Korean Crystal Growth and Crystal Technology 2023 KCI Impact Factor : 0.19

pISSN : 1225-1429 / eISSN : 2234-5078
https://journal.kci.go.kr/jkcgct

The preparation of 0.9PMN-0.1PT ceramics by the metal alkoxide method and the effect of excess Mg(OC2H5)2,Pb(CH3COO)2 H 2O are reported. The excess Mg(OC2H5)2 addition signficantly afects the rate of perovskite phase forma-tion in 0.9PMN-0.1PT ceramics. The sample by addition of 5 wt% excess Mg(OC2H5)2 sintered at 1150oC for 1 hr obtainedperovskite single phase and showed 98 % of the theoretical density. The dielectric constant of the pelets sintered at 1150oCwas increased by the adition of 5 wt% exces Mg(OC2H5)2 and had a maximum value of 15000 at 1 kHz.Key words 0.9PMN-0.1PT ceramics, Metal alkoxide method, Perovskite, Dielectric constant. -... .. 0.9PMN-0.1PT .... ...... .... ........ ...... , .. , 520-714(2000. 10. 24. .. )

TiO2 thin films were prepared by coating and subsequent pyrolysis processes using Titanium-naphthenate as araw material. TiO2 thin films were made by spin-coating technique on the glass substrates, and heat treated at 450oC, Thetransmitance, refractive index, crystalinity and surface morphology of the TiO2 thin films were measured by UV/Vis spec.trophotometer, x-ray difractometer and scanning electron microscope. TiO2 thin films on the slide glass showed the trans.mitance of 70~90 % and refractive index of 2.6 at 420 nm. The results of XRD and SEM showed that the TiO2 thin filmsexhibited the anatase phase and the thread-like surface morphology.Key words TiO2 thin film, Spin coating, Transmitance, Refractive indexTi-naphthenate. .. -.... .. TiO2 ... ...... .... .... .... ........ ..... , .. , 550-749(2001. 5. 4. .. ). . TiO2 ... ........ Titanium-naphthenate. .. -...... ..... . ..... Ti-naphthenate. toluene. ... ... ...... ... slide glass. ..... . Titanium-naphthenate ... spin-coating...... .... 450oC.. ..... TiO2 ... ..... . ... ... ... UV/Vis, XRD . SEM ... ... ... , ... , ... . .. ... ..... . Slide glass .. ... TiO2 ... .... 70~90 % ..420 nm... .... 2.6... . TiO2 ... anatase .. ..... ... ... ... .. ... ..... .1. . .TiO2. . . ... ..... ... .... .

Luminescence and scintillation properties of PbWO4, XAlO3 (X = Y, Lu, Y-Lu) and LiBaF3 based scintillators are reported. The effect of present and often not understood defect states is demonstrated in different scintillator parameters and related measurements are discussed. Importance of understanding of defect states participating in the processes of energy transfer and storage in the scintillating materials is emphasised.