oxygen valence 中文意思是什麼
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The silicon atom occupies the space opening ( interstice ) between the oxygen atoms and shares four valence electrons with the four oxygen atoms
硅原子占據了氧原子之間的空隙並且和四個氧原子共用化合價。 -
We also have analyzed the photoluminescence ( pl ) spectra of some zno films, it turns out that the emission of ultraviolet light comes from the radiative recombination of excitons within nano - crystal energy band - gap, and the pl peaks move to smaller wavelength because zn are substituted by fe, co, and cu, which cause the size of the film grains smaller and the effective band - gap bigger. the red emission of zno films is due to, on the one hand, decrease of the film grains size which causes the emission intensity smaller and smaller until it disappears abruptly, on the other hand, the transition of electrons from deep donor level of the oxygen vacancies to the valence band
另外，我們還對薄膜光致發光性質進行了分析和研究，結果表明：納米結構zno薄膜的紫外發光來源於帶間激子的輻射復合發光， pl譜的帶邊發射峰發生藍移是由於fe 、 co 、 cu對zn的替代使薄膜粒子的尺寸減小，使薄膜的有效帶隙增寬； zno薄膜的紅色發光，一方面是zno顆粒尺寸的減少，帶間的激子發射峰越來越弱直至猝滅，另一方面主要是與zno晶格中的o空位有關，由深能級復合發光引起紅光發射。 -
Abstract : in this work, atom structure features of rare earth elements have been analyzed. reasons why changeable valence rare earth oxide can strengthen stability of atom valence in oxidized state, ability to conserve oxygen and heat stability for catalysts are discussed from mechanism. auxiliary catalyst functions are understood more deeply on the base theory
文摘:本文從原子結構分析了變價稀土元素原子的結構特點，從機理上分析了變價稀土氧化物對催化劑原子氧化價的穩定性、貯氧能力和熱穩定性等性能增強的根源，從理論上深入認識了稀土氧化物的助催化作用。 -
When the thickness increases to upon the critical value, the chemical valence of element ni in the top layers of lno film deposited in the relatively low oxygen pressure is + 3
當氧分壓在臨界值以上時， lno薄膜在整個沉積過程中（膜厚小於30nm ）的rheed圖樣是條紋狀，表明層狀方式外延生長的特徵。
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