EFFECT OF Ti ON THE OPTICAL BAND GAP OF FERROELECTRIC BaTixO5-BASED BULK GLASS
EFFECT OF Ti ON THE OPTICAL BAND GAP OF FERROELECTRIC BaTixO5-BASED BULK GLASS
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DOI：
10.1142/s0217984909020497
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发表时间：
2009-07
影响因子：
1.9
通讯作者：
J. Ahmad;S. Alam;Jianding Yu;Y. Arai
中科院分区：
文献类型：
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作者：
J. Ahmad;S. Alam;Jianding Yu;Y. Arai
在室温下测量了最近用无容器合成技术制备的BaTixO_5（x=1.7，2，2.1）基铁电玻璃在190-800 nm波长范围内的光透射率。在紫外（UV）区域中观察到的透射率急剧下降，其随着x的增加而向更长波长区域移动，这与基本吸收边相关联。从从透射光谱计算的吸收系数的线性区域，对于x=1.7，估计光学带隙为3.41 eV，其随着x的增加而减小。的Urbach能量增加增加x证明增加的铁电BaTixO 5玻璃中的结构无序增加Ti浓度。
Optical transmittance on ferroelectric BaTixO5 (x=1.7, 2, 2.1)-based glasses prepared recently by a containerless synthesis technique is measured at room temperature in the wavelength range 190–800 nm. A sharp decrease in the transmittance observed in the ultraviolet (UV) region, which shifts toward longer wavelength region on increasing x is associated with fundamental absorption edge. From the linear region of the absorption coefficient calculated from the transmittance spectrum the optical band gap of 3.41 eV is estimated for x=1.7, which decreases on increasing x. The Urbach energy increases on increasing x demonstrating an increase of structural disorder in the ferroelectric BaTixO5 glass on increasing Ti concentration.