Abstract
La1−xSrxTiO3+δ has attracted much attention as an important perovskite oxide. However, there are rare reports on its optical properties, especially reflectivity. In this paper, its structural and optical properties were studied. The X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy and spectrophotometer were used to characterize the sample. The results show that with increasing Sr concentration, the number of TiO6 octahedral layers in each “slab” increases and the crystal structure changes from layered to cubic structure. A proper Sr doping (x = 0.1) can increase the reflectivity, reaching 95% in the near infrared range, which is comparable with metal Al measured in the same condition. This indicates its potential applications as optical protective coatings or anti-radiation materials at high temperatures.
Highlights
Perovskite structure oxides (ABO3) are of exceptional technological importance, due to their excellent physical properties, such as superconductivity, magnetism and ferroelectricity [1]
With increasing the Sr concentration, m increases and the crystal structure changes from layered to cubic structure with a critical concentration of approximately 0.5
This paper has investigated the structural and optical property of La1−xSrxTiO3+δ (0 ≤ x < 1)
Summary
Perovskite structure oxides (ABO3) are of exceptional technological importance, due to their excellent physical properties, such as superconductivity, magnetism and ferroelectricity [1]. These properties could be significantly changed by distorting their crystal structure, doping the A or B site elements, introducing some defects or undergoing special conditions (high temperature, oxidizing or reduced atmosphere), etc. As an important perovskite structure oxide, A-site doped La1−xSrxTiO3+δ exhibits excellent chemical and physical stabilities. It has a wide variety of applications, such as Materials 2014, 7 electrodes, most often exploiting its good electrical conductive property. Its crystal structure [9,10,11] and magnetic property [12] have been intensively reported
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