Numerous relevant papers have been published in J. Alloys Compd. and other Journals since 2010 especially since 2011. Some key, important or/and latest research results should be mentioned and cited in the section of introduction instead of outdated or earlier papers so that we can provide a solid background and progress to the readers regarding the current state-of-knowledge on this topic. Therefore, I strongly require you to rewrite this part and then update your citations, or it is very hard for me to accept your manuscript.