XRD and Mossbauer studies of crystallographic and magnetic transformations in synthesized Zn-substituted Cu-Ga-Fe compound

Journal Article · Wed Dec 01 00:00:00 EST 2004 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2004.09.021· OSTI ID:20658221

Ata-Allah, S S ^[1]

---

1. Reactor and Neutron Physics Department, Nuclear Research Center, Atomic Energy Authority, P.O. Box Enshase, Cairo 13759 (Egypt)

System of samples in the form of Cu{sub 1-x}Zn{sub x}Fe{sub 2-y}Ga{sub y}O{sub 4} with (0.0=<x=<1.0, y=0.0 and 1.0) is synthesized. X-ray diffraction study confirms the presence of a single-phase structure, where tetragonal unit cell is obtained for samples CuFe{sub 2}O{sub 4} and CuGaFeO{sub 4} with c/a>1. At compositional parameter x>=0.25, tetragonal-to-cubic transformation occurs. The determined lattice parameter a for the cubic samples is found to decrease with increasing Zn content x. {sup 57}Fe Mossbauer measurements at 293, 77 and 12K show characteristic spectra of paramagnetic, magnetic, and electronic types for the different compositions. Cation distribution obtained from the spectral analysis at 12K revealed transformation from the ferrimagnetic inverse spinel of CuFe{sub 2}O{sub 4} to the antiferromagnetic normal spinel of ZnFe{sub 2}O{sub 4}. Hyperfine parameters are found to be strongly dependent on temperature and concentration parameter x. Low-temperature measurements are carried out using installed and well-calibrated closed-cycle variable temperature cryostat Model REF-399-D22. Low vibration is obtained through bellows, spacer, and exchange gas isolation and a difference of 0.018mms{sup -1} between the FWHM of a pure iron foil at room temperature and 12K is achieved.

• OSTI ID: 20658221
• Journal Information: Journal of Solid State Chemistry, Vol. 177, Issue 12; Other Information: DOI: 10.1016/j.jssc.2004.09.021; PII: S0022-4596(04)00521-3; Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ANTIFERROMAGNETISM
COPPER COMPOUNDS
CRYOSTATS
CRYSTAL-PHASE TRANSFORMATIONS
CRYSTALLOGRAPHY
CUBIC LATTICES
GALLIUM COMPOUNDS
IRON COMPOUNDS
LATTICE PARAMETERS
PARAMAGNETISM
SPECTRA
SPINELS
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TETRAGONAL LATTICES
X-RAY DIFFRACTION