研究目的
To prepare and characterize transparent ceramics of Y2O3 co-doped with La and Nd, and to investigate their optical, magneto-optical, luminescence, and scintillation properties for potential applications in lasers and magneto-optical devices.
研究成果
The modified EDTA gel process and HIP sintering successfully produced single-phase, high-density transparent ceramics. Doped Y2O3 showed strong luminescence, long lifetime (315 ns), high Verdet constant (over 1000 deg/T?m), and reduced band gap (2.35 eV). These properties make the material promising for applications in lasers and magneto-optical devices, despite some limitations in transparency and mechanical properties.
研究不足
The ceramics exhibited relative low transparency due to surface defects like porosity and precipitates, possibly from carbon contamination during sintering. Measurement error for Verdet constant was above 5%, and discrepancies with previous data were noted. The material's mechanical properties were not sufficiently good, and transparency was lower than theoretical values.
1：Experimental Design and Method Selection:
The study used a modified sol-gel process (EDTA gel process) for powder synthesis and hot isostatic pressing (HIP) for sintering to achieve high-density transparent ceramics. Methods included SEM, XRD, UV/VIS/NIR and IR spectrometry, luminescence excitation with an 808 nm laser, lifetime measurements, and Verdet constant measurements using a custom-built spectrometer.
2：Sample Selection and Data Sources:
Samples were prepared as La0.1Nd0.1Y1.8O3 and pure Y2O3 (reference) using nitrate salts and EDTA. Data were collected from synthesized ceramics.
3：1Nd1Y8O3 and pure Y2O3 (reference) using nitrate salts and EDTA. Data were collected from synthesized ceramics.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included FEI Nova NanoSEM 200 SEM with EDAX Genesis XM X-ray microanalysis system, X'Pert XRD diffractometer (Panalytical), Specord 210VPlus UV/VIS/NIR spectrometer (Analytik Jena), FT-IR Brucker 70 V spectrometer, continuous wave 808 nm diode laser (Spectra Laser), ThorLabs spectrometer, Fluorolog Tau-3 Lifetime System (Horiba), and a custom-built Verdet constant measurement setup. Materials included La(NO3)3×6H2O, Nd(NO3)3×6H2O, Y(NO3)3×6H2O (all Sigma-Aldrich), EDTA (Aldrich), and other chemicals for synthesis.
4：Experimental Procedures and Operational Workflow:
Powders were synthesized via citrate method with EDTA, calcined, milled, pressed into green bodies, sintered via HIP at 1400°C in argon, annealed, and polished. Measurements were conducted at room temperature for SEM, XRD, spectrometry, luminescence, lifetime, and Verdet constant.
5：Data Analysis Methods:
Data were analyzed using ImageJ for grain size, Highscore Plus software for XRD, and fitting functions for lifetime and band gap calculations (e.g., Scherrer equation, single-exponential decay, Tauc plot).
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
