Abstract
[ <TEX>$Nd_{2x}Cd_{2-3x}SiO_4$</TEX> ](<TEX>$0.01{\leq}x{\leq}0.21$</TEX>) [S1-S3: x=0.01, 0.11 and 0.21] 고용체를 졸-겔 방법을 통해 합성하였다. X선 분말회절(XRD) 측정은 <TEX>$P2_1$</TEX>/m 공간군의 단사정계를 보여준다. 평균 결정 크기는 20-45 nm이다. 주사전자현미경(SEM)으로 살펴본 모양은 구형의 특성을 보인다. 에너지 분산 X 선 분광기(EDS) 결과로부터 모든 구성 원소의 존재를 확인하였다. ~750 nm에서의 흡수 밴드는 <TEX>$Nd^{3+}$</TEX> 이온의 <TEX>$^4I_{9/2}{\rightarrow}^4F_{7/2}+^4S_{3/2}$</TEX> 전이에 기인한다. 10, 40, 77, 300 K에서 S1-S3의 전자 상자성 공명 (EPR) 선모양은 <TEX>$Nd^{3+}$</TEX> 이온의 빠른 스핀 격자 이완에 기인하는 폭이 넓은 구분되지 않은 등방성의 선모양을 보여준다. Synthesis of <TEX>$Nd_{2x}Cd_{2-3x}SiO_4$</TEX> (<TEX>$0.01{\leq}x{\leq}0.21$</TEX>) [S1-S3: x=0.01, 0.11 and 0.21] solid solutions were prepared by solgel method. Powder x-ray diffraction (XRD) results show monoclinic unit cell with space group P21/m. The average crystallite sizes are found to be 20 to 45 nm. The Scanning Electron Microcopy (SEM) images show morphology of the sample is in globular nature. The energy dispersive analysis of x-rays (EDX) and X-ray mapping results confirmed that all the constituent elements of the composites were present and that were distributed in uniformly. The optical absorption band at ~750 nm was due to <TEX>$^4I_{9/2}{\rightarrow}^4F_{7/2}+^4S_{3/2}$</TEX> transition optically active <TEX>$Nd^{3+}$</TEX> ions. Electron Paramagnetic Resonance (EPR) lineshapes of S1-S3 at 10, 40, 77 and 300 K show a broad unresolved isotropic lineshapes were observed due to rapid spin lattice relaxation of <TEX>$Nd^{3+}$</TEX>.
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