Buy article online - an online subscription or single-article purchase is required to access this article.
Neutron and X-ray powder diffraction have been used to investigate the differences between the crystal growth of ferrite magnetic nanoparticles (MFe2O4 with M = Mn, Fe, Co, Ni, Zn) by two methodologies: microwave radiation and thermal decomposition routes. Rietveld refinement has been used to extract the cationic distribution, the microstructure and magnetic information. Results for the nanoparticles produced by the two procedures evidence similar cationic distribution, microstructure and magnetic properties: complete cationic disorder for M = Mn and Co, crystal size around/below 10 nm etc. It is thus proven that microwave-assisted growth is a promising eco-friendly synthetic technique for the generation of high-quality nanocrystals with comparable structure and properties to those produced by the thermal methodology, even though the microwave route needs a shorter time and lower annealing temperature to obtain the final crystal nanoparticles.
Supporting information
Program(s) used to refine structure: FULLPROF.
Crystal data top
Fe2O4Zn | V = 590.80 (5) Å3 |
Mr = 241.07 | Z = 8 |
Cubic, Fd3m | Constant Wavelength Neutron Diffraction radiation |
Hall symbol: -F 4vw 2vw 3 | T = 300 K |
a = 8.3910 (4) Å | |
Data collection top
Radiation source: nuclear reactor | 2θmin = 1.066°, 2θmax = 128.966°, 2θstep = 0.100° |
Refinement top
Rp = 0.939 | χ2 = NOT FOUND |
Rwp = 1.198 | 1280 data points |
Rexp = 0.814 | 23 parameters |
RBragg = 0.995 | 0 restraints |
Crystal data top
Fe2O4Zn | V = 590.80 (5) Å3 |
Mr = 241.07 | Z = 8 |
Cubic, Fd3m | Constant Wavelength Neutron Diffraction radiation |
a = 8.3910 (4) Å | T = 300 K |
Data collection top
2θmin = 1.066°, 2θmax = 128.966°, 2θstep = 0.100° | |
Refinement top
Rp = 0.939 | χ2 = NOT FOUND |
Rwp = 1.198 | 1280 data points |
Rexp = 0.814 | 23 parameters |
RBragg = 0.995 | 0 restraints |
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top | x | y | z | Uiso*/Ueq | Occ. (<1) |
Fe1 | 0.12500 | 0.12500 | 0.12500 | 0.00887* | 0.621 (16) |
Zn1 | 0.12500 | 0.12500 | 0.12500 | 0.00887* | 0.379 (16) |
Fe2 | 0.50000 | 0.50000 | 0.50000 | 0.00887* | 0.689 (8) |
Zn | 0.50000 | 0.50000 | 0.50000 | 0.00887* | 0.311 (8) |
O1 | 0.2535 (3) | 0.2535 (3) | 0.2535 (3) | 0.00887* | 0.99994 |
Geometric parameters (Å, º) top
Fe1—O1 | 1.8676 | | |
| | | |
O1—Fe1—O1i | 109.5 | | |
Symmetry code: (i) x, −y+1/4, −z+1/4. |
Experimental details
Crystal data |
Chemical formula | Fe2O4Zn |
Mr | 241.07 |
Crystal system, space group | Cubic, Fd3m |
Temperature (K) | 300 |
a (Å) | 8.3910 (4) |
V (Å3) | 590.80 (5) |
Z | 8 |
Radiation type | Constant Wavelength Neutron Diffraction |
Specimen shape, size (mm) | ?, ? × ? × ? |
|
Data collection |
Diffractometer | ? |
Specimen mounting | ? |
Data collection mode | ? |
Scan method | ? |
2θ values (°) | 2θmin = 1.066 2θmax = 128.966 2θstep = 0.100 |
|
Refinement |
R factors and goodness of fit | Rp = 0.939, Rwp = 1.198, Rexp = 0.814, RBragg = 0.995, χ2 = NOT FOUND |
No. of parameters | 23 |
Subscribe to Journal of Applied Crystallography
The full text of this article is available to subscribers to the journal.
If you have already registered and are using a computer listed in your registration details, please email
support@iucr.org for assistance.