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首页> 外文期刊>RSC Advances >Quantitative studies on the size induced anatase to rutile phase transformation in TiO2-SiO2 binary oxides during heat treatments
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Quantitative studies on the size induced anatase to rutile phase transformation in TiO2-SiO2 binary oxides during heat treatments

机译：TiO2-SiO2二元氧化物热处理过程中尺寸诱发的锐钛矿相向金红石相变的定量研究

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The effect of SiO2 content on the phase behavior of TiO2 during heat treatment was investigated in the present study. Sol-gel synthesis was employed to form five different TiO2-SiO2 binary oxides. The characterization results confirmed the vital role of SiO2 in reducing the crystallite growth of TiO2, which was instrumental in restricting the anatase (a-TiO2) to rutile (r-TiO2) phase transformation. It was revealed from the characterization techniques that crystallite size exceeding similar to 50 nm induced a-TiO2 to r-TiO2 phase transition. Heat treatment beyond 1100 degrees C resulted in the gradual conversion from a-TiO2 to r-TiO2 and moreover the crystallization of cristobalite (c-SiO2) could not be avoided at 1300 degrees C. The results from the photoemission spectra ensured a blue shift for the a-TiO2 stabilized by SiO2 from the characteristic emissions of pure r-TiO2. Antibacterial tests also indicated a good response for TiO2-SiO2 binary oxides in encountering the microbes.
机译：研究了SiO2含量对热处理过程中TiO2相行为的影响。溶胶-凝胶合成被用来形成五种不同的TiO2-SiO2二元氧化物。表征结果证实了SiO2在减少TiO2的微晶生长中的重要作用，这在限制锐钛矿（a-TiO2）向金红石（r-TiO2）的相变中起重要作用。从表征技术中揭示出，晶粒尺寸超过类似于50nm的晶粒引起α-TiO2向r-TiO 2的相变。超过1100摄氏度的热处理导致从a-TiO2逐渐转变为r-TiO2，此外，在1300摄氏度无法避免方石英（c-SiO2）的结晶。光发射光谱的结果确保了C的蓝移。纯r-TiO2的特征排放可以通过SiO2稳定α-TiO2。抗菌测试还表明，TiO2-SiO2二元氧化物在遇到微生物时反应良好。

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