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Title: Effect of manganese substitution of ferrite nanoparticles on particle grain structure

Journal Article · · Nanoscale Advances
DOI: https://doi.org/10.1039/d2na00200k · OSTI ID:2202629
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1];  [1];  [3];  [2]; ORCiD logo [1]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [1]
  1. Clemson Univ., SC (United States)
  2. Univ. of South Carolina, Columbia, SC (United States)
  3. Clemson Univ., SC (United States); Suzhou Novartis Technical Development Co., Ltd, Changshu (China)
  4. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
  5. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

To investigate the influence of manganese substitution on the saturation magnetization of manganese ferrite nanoparticles, samples with various compositions (MnxFe3–xO4, x = 0, 0.25, 0.5, 0.75, and 1) were synthesized and characterized. The saturation magnetization of such materials was both calculated using density functional theory and measured via vibrating sample magnetometry. A discrepancy was found; the computational data demonstrated a positive correlation between manganese content and saturation magnetization, while the experimental data exhibited an inverse correlation. X-ray diffraction (XRD) and magnetometry results indicated that the crystallite diameter and the magnetic diameter decrease when adding more manganese, which could explain the loss of magnetization of the particles. For 20 nm nanoparticles, with increasing manganese substitution level, the crystallite size decreases from 10.9 nm to 6.3 nm and the magnetic diameter decreases from 15.1 nm to 3.5 nm. Further high resolution transmission electron microscopy (HRTEM) analysis confirmed the manganese substitution induced defects in the crystal lattice, which encourages us to find ways of eliminating crystalline defects to make more reliable ferrite nanoparticles.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
89233218CNA000001; NA0003525
OSTI ID:
2202629
Report Number(s):
LA-UR--21-29249
Journal Information:
Nanoscale Advances, Journal Name: Nanoscale Advances Journal Issue: 18 Vol. 4; ISSN 2516-0230
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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