Corrigendum to "Mg3Y2Ge3O12:Bi3+ UV fluorescent phosphor as the TiO2 "sensitizer" for enhancing the heavy oil viscosity reduction" [Ceram. Int. 45 (2019) 13112–13118]. Issue 11 (1st June 2021) - Zhou, Jingxin; Wang, Ran; Jiao, Tifeng; Bai, Zhenhua; Wang, Xinxing; Guo, Ying; Zhang, Qian; Peng, Qiuming