Experimental and theoretical investigations of indium-115 electric-field-gradient (EFG) tensors of indium(III) oxide, In₂O₃, have been presented. Field-stepwise-swept QCPMG solid-state ¹¹⁵In NMR experiments are carried out at T ​= ​120 ​K, observed at 52.695 ​MHz, and in the range of external magnetic fields between 4.0 and 6.5 ​T. The spectral simulations yield the quadrupolar coupling constant, C_Q value, of 183(2) MHz and the asymmetry parameter, η_Q, of 0.05(5), for In(1), and that of 126(2) MHz and η_Q of 0.86(5) for In(2). Quantum chemical calculations are carried out to provide ¹¹⁵In EFG tensor orientations with respect to the molecular structure. A relationship between operative frequencies and variable ranges of external magnetic fields is briefly discussed for field-swept solid-state ¹¹⁵In NMR.

提出了铟（III）氧化物In ₂ O ₃的铟115电场梯度（EFG）张量的实验和理论研究。场逐步扫描QCPMG固态¹¹⁵ In NMR实验在T  = 120 K，在52.695 MHz观察到，并且在4.0至6.5 T的外部磁场范围内进行。光谱模拟产生的四极耦合常数，Ç _Q值，183（2）MHz，并且将不对称性参数，η _Q，为0.05（5），用于在（1），以及126（2）MHz和η _Q对于In（2）为0.86（5）。进行量子化学计算可提供¹¹⁵在EFG中，张量方向相对于分子结构。对于场扫描固态¹¹⁵ In NMR，简要讨论了工作频率与外部磁场的可变范围之间的关系。