A comparative assessment of the structural, elastic and electronic properties of Nb3Pt and NbPt3 phases through firstprinciples study
- Fono-Tamo, R.S., Tien-Chien, Jen, Bhila, O.
- Authors: Fono-Tamo, R.S. , Tien-Chien, Jen , Bhila, O.
- Date: 2018
- Language: English
- Type: Conference proceeding
- Identifier: http://hdl.handle.net/10210/290302 , uj:31513 , Citation: Fono-Tamo, R.S., Tien-Chien, J. & Bhila, O. 2018. A comparative assessment of the structural, elastic and electronic properties of Nb3Pt and NbPt3 phases through firstprinciples study.
- Description: Abstract: Two phases of the Nb-Pt system namely Nb3Pt and NbPt3 have been studied using first principles approach in CASTEP. Structural, elastic and electronic properties of the concerned binary alloys were determined and examined against each other. Although both alloys have the same structure, it was observed that the percentage difference in the change of lattice parameters varied. Nb3Pt exhibited a 0.073% change while NbPt3 had a 14.809% change making Nb3Pt more stable struturaly than NbPt3. The elastic properties showed that both binaries are ductile materials but NbPt3 proved to be more ductile than Nb3Pt based on Born, Pugh’s and Frantsevich’s criteria. Through the electronic properties, both binaries were proven to be conducting and their bonding nature seen as a combination of ionic metallic and covalent bond.
- Full Text:
- Authors: Fono-Tamo, R.S. , Tien-Chien, Jen , Bhila, O.
- Date: 2018
- Language: English
- Type: Conference proceeding
- Identifier: http://hdl.handle.net/10210/290302 , uj:31513 , Citation: Fono-Tamo, R.S., Tien-Chien, J. & Bhila, O. 2018. A comparative assessment of the structural, elastic and electronic properties of Nb3Pt and NbPt3 phases through firstprinciples study.
- Description: Abstract: Two phases of the Nb-Pt system namely Nb3Pt and NbPt3 have been studied using first principles approach in CASTEP. Structural, elastic and electronic properties of the concerned binary alloys were determined and examined against each other. Although both alloys have the same structure, it was observed that the percentage difference in the change of lattice parameters varied. Nb3Pt exhibited a 0.073% change while NbPt3 had a 14.809% change making Nb3Pt more stable struturaly than NbPt3. The elastic properties showed that both binaries are ductile materials but NbPt3 proved to be more ductile than Nb3Pt based on Born, Pugh’s and Frantsevich’s criteria. Through the electronic properties, both binaries were proven to be conducting and their bonding nature seen as a combination of ionic metallic and covalent bond.
- Full Text:
Effect of ingredient particle sizes on surface roughness characteristics of PKS brake lining
- Fono-Tamo, R.S., Tien-Chien, Jen
- Authors: Fono-Tamo, R.S. , Tien-Chien, Jen
- Date: 2017
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/260171 , uj:27389 , Citation: Fono-Tamo, R.S. & Tien-Chien, J. 2017. Effect of ingredient particle sizes on surface roughness characteristics of PKS brake lining.
- Description: Abstract: experience mechanical damage when they are exposed to a corrosive environment. A typical solid surface like a brake pad has a complex structure and complex properties depending on the nature of the solids, the method of surface preparation, and the interaction between the surface and the environment. The surface roughness of a novel friction linings prepared using varying palm kernel shell (PKS) powder particle sizes (0.300 mm, 0.425 mm and 0.850 mm) as reinforcements were investigated. The investigation was conducted via a profilometer dotted with a diamond stylus at a speed of 0.2 mm/s. The determined surface roughness parameters values were in ascending order with S0.300 having the least values (Ra = 6.13 μm, Rz = 24.04 μm and Rmax = 37.3 μm) and S0.850 having the highest values (Ra = 9.87 μm, Rz = 37.28 μm and Rmax = 53.8 μm). This was an indication that the roughness characteristics of the reinforced composite were associated to the presence of pulverised PKS particles. It was further shown by scanning electron microscope images that pulverised PKS grain sizes by nature have rough surfaces and this could have contributed to the overall roughness behaviour of the reinforced composite since PKS was the only ingredient with grain size variation in the experiment.
- Full Text:
- Authors: Fono-Tamo, R.S. , Tien-Chien, Jen
- Date: 2017
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/260171 , uj:27389 , Citation: Fono-Tamo, R.S. & Tien-Chien, J. 2017. Effect of ingredient particle sizes on surface roughness characteristics of PKS brake lining.
- Description: Abstract: experience mechanical damage when they are exposed to a corrosive environment. A typical solid surface like a brake pad has a complex structure and complex properties depending on the nature of the solids, the method of surface preparation, and the interaction between the surface and the environment. The surface roughness of a novel friction linings prepared using varying palm kernel shell (PKS) powder particle sizes (0.300 mm, 0.425 mm and 0.850 mm) as reinforcements were investigated. The investigation was conducted via a profilometer dotted with a diamond stylus at a speed of 0.2 mm/s. The determined surface roughness parameters values were in ascending order with S0.300 having the least values (Ra = 6.13 μm, Rz = 24.04 μm and Rmax = 37.3 μm) and S0.850 having the highest values (Ra = 9.87 μm, Rz = 37.28 μm and Rmax = 53.8 μm). This was an indication that the roughness characteristics of the reinforced composite were associated to the presence of pulverised PKS particles. It was further shown by scanning electron microscope images that pulverised PKS grain sizes by nature have rough surfaces and this could have contributed to the overall roughness behaviour of the reinforced composite since PKS was the only ingredient with grain size variation in the experiment.
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