摘 要: 钇铁石榴石(Y 3 Fe 5 O 12 , YIG)材料因其优异的磁性能和磁光性能在微波通信、激光技术和光纤通讯等领域具 有重要应用。离子掺杂是提高 YIG 材料磁光性能的有效途径之一, 本研究选择离子半径适配的 Bi 3+ 掺杂改性 YIG 陶瓷以提高材料的磁光性能。本工作采用固相法热压烧结制备 Bi x Y 3-x Fe 5 O 12 (x=0、0.3、0.6、0.9)陶瓷, 并研究 Bi 3+ 掺杂对 YIG 陶瓷材料相结构、微观形貌、红外透过性、磁性能以及磁光性能的影响。结果表明: 陶瓷样品均呈石 榴石立方相结构; 显微结构致密, Bi 3+ 掺杂后晶粒尺寸不同程度增大; 样品红外透过率良好, 随 Bi 3+ 掺杂量增大而 降低; 陶瓷样品的法拉第旋转角随 Bi 3+ 掺杂量增加呈线性变化, Bi 3+ 掺杂量每增加 1% (原子分数), 在波长 1064 nm 和 1550 nm 处变化量分别约为-49.0 (°)/cm 和-30.2 (°)/cm。 Bi 0.6 Y 2.4 Fe 5 O 12 陶瓷样品在 1064 nm 和 1550 nm 波长下法 拉第旋转角分别达到-703.3 (°)/cm 和-461.5 (°)/cm, 绝对值远高于未掺杂 YIG 陶瓷的 277.6 (°)/cm 和 172.0 (°)/cm。 由此可见, 掺杂适量 Bi 3+ 可以显著增强 YIG 陶瓷材料的磁光性能。

Infrared transparent Ce‐doped Y3Fe5O12 (Ce: YIG, CexY3‐xFe5O12, x = 0, 0.12, 0.24, 0.36) ceramics were successfully produced by the solid‐state reaction using a hot‐press sintering process from the Y2O3, Fe2O3, and CeO2 powders. The phase structure, microstructure, infrared transmittance, and magnetic and magneto‐optical properties of the Ce‐doped Y3Fe5O12 ceramics were measured and analyzed. The in‐line transmittances of the Ce‐doped Y3Fe5O12 ceramics with the x = 0, 0.12, 0.24 (L = 0.5 mm) at 1550 nm were about 72%, 66.5%, and 57.6%, respectively. In the state of saturation magnetization, the Faraday rotation angle per centimeter (θF) of CexY3‐xFe5O12 (x = 0, 0.12, 0.24) ceramics measured by the light extinction method was 182.5, −410.4, and −958.3 deg./cm, respectively. The change of the θF was about −142.5 deg./cm when per 1at.% Ce was substituted in the dodecahedral site of YIG materials. The (Ce0.24Y2.76)Fe5O12 ceramics were determined as the optimized composition for its excellent infrared optical and magneto‐optical properties.