List of Articles Mohammad Reza Loghman-Estarki

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  1 - An overview of the polyol synthesis process of cobalt carbide magnetic nanoparticles
  مهدی کبریایی علی قاسمی محمدرضا لقمان شهاب ترکیان
  This review explores the synthesis of cobalt carbide nanoparticles through a polyol reduction method, highlighting their acicular morphology, cluster assembly, and magnetic properties. The study reveals room temperature coercivities exceeding 3.4 kOe and maximum energy More

  This review explores the synthesis of cobalt carbide nanoparticles through a polyol reduction method, highlighting their acicular morphology, cluster assembly, and magnetic properties. The study reveals room temperature coercivities exceeding 3.4 kOe and maximum energy products surpassing 20 kJ m-3. The composition of Co3C and Co2C phases, along with factors such as particle size and morphology, crucially influences permanent magnet characteristics. The acicular shape enhances coercivity and offers potential for particle alignment in nanocomposite cores. However, limitations arise at elevated temperatures due to irreversible dissociation. Further investigation into optimizing particle size, chemistry, and morphology is warranted. Additionally, the polyol process with PVP is shown to induce the formation of Co3C-structured Co carbide particles with enhanced coercivity. The use of hydroxide and chloride anions in the polyol process yields exchange-coupled cobalt–carbide nanocomposites and single-phase Co2C nanoparticles, each exhibiting distinct magnetic properties. Synthesis under a high external magnetic field results in cobalt–cobalt carbide microwires with controlled morphology and composition. The study also demonstrates the successful synthesis of cobalt carbide magnetic nanoparticles via a modified polyol process without rare-earth catalysts, showcasing promising magnetization and coercivity values at room temperature. The influence of reaction parameters, such as temperature, hydroxyl ion concentrations, and duration, on the crystallographic structure and magnetic properties is elucidated. Manuscript profile