Singh Punita, Deepa M, Srivastava A K, Sood K N, Kar M
National Physical Laboratory, New Delhi 110012, India.
J Nanosci Nanotechnol. 2009 Nov;9(11):6637-42. doi: 10.1166/jnn.2009.1316.
(50-x)Na2O-50P2O5-xAgCl (x = 0 to 15 mol%) glasses in bulk form were synthesized using melt-quenching technique. Thin films of these silver doped sodium phosphate glasses were deposited by thermal evaporation process. The influence of deposition of these glasses in thin film form and subsequent annealing at 600 degrees C on the structure and optical properties such as transmittance, reflectance, refractive index and band gap have been investigated in detail. X-ray diffraction studies of the as-deposited films show the films to be amorphous whereas annealed films show existence of orthorhombic and monoclinic phase of NaPO3 along with crystalline cubic phase of AgCl in doped glasses. Structural investigations of these annealed films show unique morphologies (needle-like and granular) at nano-scale. Both as-fabricated and annealed films are poor reflectors but show high transmittance in the entire spectral region under consideration, which is a direct consequence of particle size effects. Indirect band gap narrowing and variation in refractive index upon annealing is consistent with nanostructural transformations in these samples.
采用熔融淬火技术合成了块状的(50 - x)Na₂O - 50P₂O₅ - xAgCl（x = 0至15摩尔%）玻璃。通过热蒸发工艺沉积这些掺银磷酸钠玻璃的薄膜。详细研究了这些玻璃以薄膜形式沉积并随后在600℃退火对其结构和光学性能（如透射率、反射率、折射率和带隙）的影响。对沉积态薄膜的X射线衍射研究表明薄膜为非晶态，而退火后的薄膜显示在掺杂玻璃中存在NaPO₃的正交相和单斜相以及AgCl的立方晶相。对这些退火薄膜的结构研究表明在纳米尺度上具有独特的形态（针状和颗粒状）。制备态和退火后的薄膜都是不良反射体，但在所考虑的整个光谱区域都显示出高透射率，这是粒径效应的直接结果。退火后间接带隙变窄和折射率变化与这些样品中的纳米结构转变一致。
