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This content will become publicly available on April 23, 2017

Title: In-situ high-pressure x-ray diffraction study of zinc ferrite nanoparticles

We have studied the high-pressure structural behavior of zinc ferrite (ZnFe2O4) nanoparticles by powder X-ray diffraction measurements up to 47 GPa. We found that the cubic spinel structure of ZnFe2O4 remains up to 33 GPa and a phase transition is induced beyond this pressure. The high-pressure phase is indexed to an orthorhombic CaMn2O4-type structure. Upon decompression the low- and high-pressure phases coexist. The compressibility of both structures was also investigated. We have observed that the lattice parameters of the high-pressure phase behave anisotropically upon compression. Further, we predict possible phase transition around 55 GPa. For comparison, we also studied the compression behavior of magnetite (Fe3O4) nanoparticles by X-ray diffraction up to 23 GPa. Spinel-type ZnFe2O4 and Fe3O4 nanoparticles have a bulk modulus of 172 (20) GPa and 152 (9) GPa, respectively. Lastly, this indicates that in both cases the nanoparticles do not undergo a Hall-Petch strengthening.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [3] ;  [4]
  1. Instituto de Tecnologia y Ciencias de la Ingenieria "Ing. Hilario Fernandez Long" (UBA-CONICET), Buenos Aires (Argentina)
  2. Univ. of Nevada, Las Vegas, NV (United States)
  3. Facultad de Ingenieria (UBA), Buenos Aires (Argentina)
  4. Univ. de Valencia, Valencia (Spain)
Publication Date:
OSTI Identifier:
1332349
Grant/Contract Number:
NA0001982; NA0001974; FG02-99ER45775; AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Solid State Sciences
Additional Journal Information:
Journal Volume: 56; Journal Issue: C; Journal ID: ISSN 1293-2558
Publisher:
Elsevier
Research Org:
Univ. of Nevada, Las Vegas, NV (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY crystal structure; nanostructure; oxides; phase transitions; X-ray diffraction