층 구조 산화물 특성 평가

소개글

광 물분해 및 이온전도체로 쓰이는 Layer 구조의 층상 산화물을 만들기 위한 합성법과 SEM, XRD, Impedance, Conductivity 데이터 정리.

목차

1. TiO2 + K2CO3 합성 몰비
2. TiO2 + Na2CO3 합성 몰비
3. 각 물질 XRD peak 분석
4. 각 물질 SEM 사진
5 각 물질 임피던스
6. 각 물질 전기전도도

본문내용

Abstract

We prepared and characterized several oxides in layered and tunnel structure based on the TiO6
octahedra with alkali metals (Na, K) as interstitials, which are known for high catalytic activity
for water photolysis. The nominal compositions prepared by the solid state reaction method
were K2Ti4O9, K2Ti6O13, Na2Ti3O7 and Na2Ti6O13. From the X-ray diffraction patterns most
samples were found to form a mixture with the phase of less alkali content in the phase diagram
of K2O-TiO2 and Na2O-TiO2. The phase distribution was also indicated in the microstructure.
The layered and tunnel structure titanates were characterized by the pronounced formation of
elongated grains according to the crystallographic anisotropy. Impedance spectroscopy has been
applied to distinguish the electrical conductivity from the low frequency polarization effects.
Apparent bulk conductivity thus obtained exhibits the activation energy values between 0.75 eV
and 1 eV.

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