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Effect of Metallic Interfacial Layers on the Properties of Diamond-Like Carbon Thin Films
Neeraj Dwivedi,Sushil Kumar,Sreekumar C,Saurabh Dayal,C. M. S. Rauthan,O.S. Panwar 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.2
Diamond like carbon (DLC) thin films with metallic interfacial layers of aluminum and nickel-chromium (Al and Ni-Cr) were grown using a low cost hybrid technique involving a resistive heating thermal evapo-rator and radio frequency plasma enhanced chemical vapor deposition techniques. Stress, hardness, elastic modulus, bonding, phase, and electrical conductivity of these films were investigated. Introduction of interfacial Al and Ni-Cr layers in DLC led to drastic improvement of its conductivity along with a signifi-cant reduction in residual stress but with some reduction of hardness and the elastic modulus. The struc-tural and surface properties of thin films were studied using X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscopy techniques.
Singh Kuldeep,Panwar Neeraj 한국물리학회 2023 Current Applied Physics Vol.53 No.-
New series of pyrochlore compounds Ga2Mn2-xCrxO7 (x = 0–0.5) has been synthesized by conventional solid-state reaction method. The X-ray diffraction analysis confirms a single-phase cubic structure of the prepared compounds. All compounds undergo a paramagnetic-antiferromagnetic transition at the N´eel transition temperature, close to 42 K. Below ~12 K temperature, magnetization measurements reveal a glassy behaviour. The value of frustration parameter indicates the presence of a spin frustration. All the compounds exhibit the Griffiths phase. The Arrott’s plots confirmed a second-order magnetic phase transition. Moreover, under 5 T applied magnetic field, the maximum value of magnetic entropy change -ΔS was 1.36 J/kg.K for Ga2Mn2O7 compound, which slightly increased to 1.47 J/kg.K for the compound with x = 0.5. At 21 K, the relative cooling power value enhanced from 42.96 J/kg to 47.73 J/kg with Cr4+-ion content changing from x = 0 to x = 0.5.
Structural and Nano-Mechanical Properties of Nanostructured Diamond-Like Carbon Thin Films
Saurabh Dayal,Sushil Kumar,Neeraj Dwivedi,Sreekumar Chockalingam,C. M. S. Rauthan,O.S. Panwar 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.3
The effect of self bias on structural and nano-mechanical properties of nanostructured diamond-like carbon (ns-DLC) thin films is explored. These films are grown at different negative self biases ranging from −100 V to −200 V using radio frequency (13.56 MHz) plasma enhanced chemical vapor deposition technique. The generation of nanostructured morphology at room temperature in these films is confirmed by scanning electron microscopy, whereas change in microstructure produced by varying the self biases is confirmed by Raman analysis. These ns-DLC films exhibit very high hardness, which varied from 16 GPa to 31 GPa. With the help of load versus displacement curves, various other important nano-mechanical parameters such as elastic modulus, elastic recovery etc are also estimated. The nano-mechanical properties are further correlated with the Raman and SEM analyses. Owing to their versatile nano-mechanical properties, these ns-DLC films may find application as hard and protective coatings.