Niobium disulfide powder
Feng Shao, Zhangliu Tian, Peng Qin, Kejun Bu, Wei Zhao, Li Xu, Deliang Wang &amp; Fuqiang Huang
CC BY 4.0
<a rel="nofollow" class="external autonumber" href="https://www.nature.com/articles/s41598-018-25449-x">[1]</a> (Fig. 1 tweaked)