A-site-ordered quadruple perovskite CeMn₇O₁₂ – the first ternary oxide in the Ce–Mn–O system – was synthesized at high pressure of 6 GPa and high temperature of about 1670 K, and its structural, magnetic, and dielectric properties were investigated. CeMn₇O₁₂ crystallizes in space group Im-3 above 649 K, and in space group I2/m below 649 K. No other structural phase transitions were found down to 10 K. Crystal structures were investigated using synchrotron X-ray powder diffraction (a = 7.50069 Å, b = 7.36836 Å, c = 7.49086 Å, β = 91.2125° at 295 K and a = 7.47367 Å at 700 K), and the structural parameters (Ce–O bond lengths) suggest the Ce³⁺ oxidation state giving the charge distribution as Ce³⁺Mn³⁺₇O₁₂. CeMn₇O₁₂ shows one long-range-ordered ferrimagnetic transition at T_N = 78 K accompanied by very weak kink-like dielectric anomalies. Strong dielectric relaxation due to extrinsic processes was observed near 18–35 K.

在6 GPa的高压和大约1670 K的高温下合成了A-位有序四重钙钛矿CeMn ₇ O ₁₂ -Ce-Mn-O系统中的第一个三元氧化物，其结构，磁性和介电性能被调查了。CeMn ₇ O ₁₂在高于649 K的空间群Im -3和低于649 K的空间群I 2 / m中结晶。在低至10 K时未发现其他结构相变。使用同步加速器X射线粉末衍射研究了晶体结构（ 在295 K时a  = 7.50069Å，b  = 7.36836Å，c  = 7.49086Å，β = 91.2125° 在700 K时a = 7.47367Å），结构参数（Ce–O键长）表明Ce ^3+的氧化态，电荷分布为Ce ³⁺ Mn ³⁺ ₇ O ₁₂。CeMn ₇ O ₁₂在T _N  = 78 K处显示出一个长范围的亚铁磁跃迁，伴随着非常弱的扭结状介电异常。在18–35 K附近观察到由于外在过程而引起的强介电弛豫。