![]() The stoichiometric composition (FeO) does not exist at ambient pressure and room temperature (RT). Wüstite Fe xO (in general x = 0.84–0.95), an antiferromagnetic compound, crystallizes in a NaCl-type defective crystal structure. The magnetization curves show a clear, unsymmetrical hysteresis, which arises from a combined effect of the superparamagnetic behavior and exchange bias. ![]() The popcorn-shaped Fe xO NPs show the typical wüstite antiferromagnetic transition at approximately 200 K, but behave very differently to their bulk counterpart below 200 K. ![]() ♼F 3COOH behaves as an antiferromagnetic triangle whose magnetic frustration is mitigated by the low symmetry of the complex. This morphology offers a large surface area and internal channels and prevents further agglomeration and thermal tumbling of the subparticles. The popcorn shape and multigrain structure had been reconstructed using high-angle annular dark-field scanning transmission electron micrograph (HAADF-STEM) tomography. Herein, we report the colloidal synthesis of phase-pure Fe xO ( x ≈ 0.94) popcorn-shaped NPs by decomposition of a single-source precursor, ♼F 3COOH. ![]() For wüstite Fe xO, however, obtaining phase-pure NPs with homogeneous morphologies have remained challenging. Colloidal nanoparticles (NPs) with myriads of compositions and morphologies have been synthesized and characterized in recent years.
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