1. School of Engineering; Newcastle University; Newcastle upon Tyne NE1 7RU UK
2. Department of Physics; College of Science; Anbar University; P.O. Box 55431 Al-Anbar Al-Ramadi Iraq
3. Department of Physics and Energy; University of Limerick; Castletroy Limerick V94 T9PX Ireland
4. National Museum of Bosnia and Herzegovina; Sarajevo 71000 Bosnia and Herzegovina
5. Centre for Materials Physics; Department of Physics; Durham University; Durham DH1 3LE UK