[Ullah, Mati; Bin Su, Wen] Shandong Univ, Sch Phys, Jinan 250100, Shandong, Peoples R China.
[Manan, Abdul] Univ Sci & Technol Bannu, Dept Phys, Adv Mat Res Lab, Peshawar 25120, Khyber Pakhtunk, Pakistan.
[Ahmad, Arbab Safeer] Islamia Coll Peshawar, Dept Phys, Peshawar 25120, Khyber Pakhtunk, Pakistan.
[Shah, Abid A.] Int Islamic Univ, Dept Civil Engn, Islamabad, Pakistan.
[Yao, Zhonghua] Wuhan Univ Technol, Sch Mat Sci & Engn, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Hubei, Peoples R China.