High-Field One-Dimensional and Two-Dimensional <sup>27</sup>Al Magic-Angle Spinning Nuclear Magnetic Resonance Study of θ-, δ-, and γ-Al<sub>2</sub>O<sub>3</sub> Dominated Aluminum Oxides: Toward Understanding the Al Sites in γ-Al<sub>2</sub>O<sub>3</sub>Suochang Xu, Jian Zhi Hu, Xinhe Bao et al.|ACS Omega|2021Cited by 59