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Updated: Jun 8, 2026

An Aptamer-based Sensor for Unchelated Gadolinium(III)
Published on: January 9, 2017
Gadolinium doped europium sulfide
Srotoswini Kar1, William L Boncher, Daniel Olszewski
1Department of Chemistry, Box 571227, Georgetown University, Washington DC 20057, USA.
Gadolinium-doped europium sulfides were synthesized, showing electron doping that suggests magnetic coupling via carrier electrons in magnetic semiconductors. The paramagnetic Curie temperature increased significantly with low doping levels.
Area of Science:
- Materials Science
- Solid State Physics
- Magnetism
Background:
- Magnetic semiconductors are crucial for spintronic applications.
- Understanding carrier-mediated magnetic coupling is key to designing new magnetic materials.
Purpose of the Study:
- To synthesize gadolinium-doped europium sulfides (Eu(1-x)Gd(x)S).
- To investigate the effect of electron doping on magnetic properties.
- To explore the relationship between doping concentration and magnetic coupling.
Main Methods:
- Thermal decomposition of specific organometallic precursors.
- X-ray powder diffraction for structural analysis.
- Magnetic property measurements, including paramagnetic Curie temperature determination.
- Inductively coupled plasma mass spectrometry (ICP-MS) for elemental analysis.
- Transmission electron microscopy (TEM) for morphological characterization.
Main Results:
- Successfully synthesized Eu(1-x)Gd(x)S for 0 ≤ x ≤ 0.1.
- Observed indirect evidence of magnetic coupling through carrier electrons.
- Determined that the paramagnetic Curie temperature (Θp) increases significantly at low doping levels, similar to Eu(1-x)Gd(x)O.
Conclusions:
- Electron doping in Eu(1-x)Gd(x)S facilitates magnetic coupling.
- The observed increase in Θp highlights the potential of Gd doping for tuning magnetic properties.
- These findings contribute to the understanding of magnetic semiconductors and their applications.
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