MgAl₂O₄ ceramics are used as promising materials in many fields, such as laser technology and sensors. The properties of the initial powders play a crucial role in the characteristics of the final ceramic. The powders depend on the hydrolysis solvents in the synthesis process. In this paper, the MgAl₂O₄: Cr³⁺ powders were synthesized by the Pechini-type hydrothermal process, and the effects of hydrophilic propylene oxide and hydrophobic toluene were investigated. In the hydrothermal process, the ring-opening reaction of propylene oxide occurred and participated in the polymerization, and toluene promoted the ring-opening reaction. The XRD and EDS data indicated that the spinel phase changed from Mg-rich to the Al-rich phase as the calcination temperature increased. The FESEM indicated that the samples obtained with propylene oxide and toluene both existed in the hydrothermal process were fold-shaped calcined at a low temperature (≤1100 ℃), the sheet-like MgAl₂O₄: Cr³⁺ powders presented at the calcination temperature of 1200 ℃. The FTIR and EDS data illustrated that the Y³⁺ ions were preferred to substitute the Al³⁺ sites of AlO₆ units. The emission spectra showed that in the powders obtained in the hydrophilic solvent, the Cr³⁺ ions were preferred to locate the tetrahedral site. Additionally, the sheet-like MgAl₂O₄: Cr³⁺ powders had better emission intensity due to their high Y³⁺ content and regular, uniform morphology.

MgAl ₂ O ₄陶瓷被用作许多领域的有前途的材料，例如激光技术和传感器。初始粉末的特性对最终陶瓷的特性起着至关重要的作用。粉末取决于合成过程中的水解溶剂。在本文中，MgAl ₂ O ₄ : Cr ³⁺采用Pechini型水热法合成粉末，考察了亲水性环氧丙烷和疏水性甲苯的影响。在水热过程中，环氧丙烷发生开环反应并参与聚合，甲苯促进开环反应。XRD 和 EDS 数据表明，随着煅烧温度的升高，尖晶石相从富镁相转变为富铝相。FESEM表明，水热过程中存在的环氧丙烷和甲苯样品在低温（≤1100℃）下煅烧成折叠状，片状MgAl ₂ O ₄ :Cr ³⁺粉末在1200℃的煅烧温度下呈现。FTIR 和EDS 数据表明Y ³⁺离子更适合替代AlO ₆单元的Al ³⁺位点。发射光谱表明，在亲水溶剂中获得的粉末中，Cr ³⁺离子优先定位四面体位点。此外，片状MgAl ₂ O ₄ : Cr ³⁺粉末由于其高Y ³⁺含量和规则、均匀的形态而具有更好的发射强度。