Low Temperature X-ray Diffraction Study of ZnCr2O4 and Ni0.5Zn0.5Cr2O4

“…Among these methods, hydrothermal route have been known as one of the economical and convenient route to control the compositional, high purity, morphology and crystals [17,18]. ZnCr 2 O 4 is a geometrically frustrated antiferromagnet compound with a first order transition at 12.5 K from paramagnetic phase with cubic structure to antiferromagnetic phase with tetragonal structure [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Facile size-controlled preparation of highly photocatalytically active ZnCr2O4 and ZnCr2O4/Ag nanostructures for removal of organic contaminants

Abbasi

Hamadanian

Salavati‐Niasari

et al. 2017

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

The ZnCrO nanoparticles were synthesized and characterized by different techniques such as; XRD, SEM, EDS, VSM, TEM and IR. In order to modify the morphology of structures, various alkaline and capping agents were used. For this work TETA, en and NH as alkaline agents and salicylaldehyde, N,N'-(bis(salicylidene)-ethylene-1,2-diamine) and SDS as capping agents were employed. The cubic morphology for the ZnCrO nanoparticles were obtained by using TETA and N,N'-(bis(salicylidene)-ethylene-1,2-diamine). When SDS and TETA were used, very uniform spherical zinc chromite nanoparticles with fine grain size were produced. Then on the surface of these nanoparticles, Ag nanoparticles were covered by photodeposition method. For investigation photocatalytic activity of the nanoparticles, several factors such as various azo dyes, temperature, grain size and morphology were investigated. Also by using of ZnCrO/Ag nanoparticles prepared polymer based nanocomposite. Results indicate that, nanoparticles can enhance the thermal stability of the PVA matrix.

show abstract

“…b Temperature dependence of I.I.2 of {(404) and (044)} reflection in The diffraction intensity can be expressed by the following Debye–Waller equation Xue et al. ( 2008 ). where is the scattered intensity from the rigid lattices, is the scattering angle, M is the mass of the atom and is the frequency of the oscillation and is the recoil-free energy.…”

Section: Resultsmentioning

confidence: 99%

“…Experimental results of low temperature X-ray diffraction (LTXRD), Xue et al. ( 2008 ) showed that below the transition temperature, the profile of (800) Bragg reflection splits into two peaks with lower angle peak having intensity twice that of the higher peak. The crystal distorted from cubic to tetragonal with with space group .…”

Section: Introductionmentioning

confidence: 99%

Magneto-structural coupling in $$Ni_xZn_{1-x}Cr_2O_4$$ N i x Z n 1 - x C r 2 O 4

et al. 2015

View full text Add to dashboard Cite

compound is well Known to show the frustration of the spin structure. At 12 K, distorts to break symmetry of the degenerated frustrated spin states by the spin-Peierls-like phase transition, accompanying with the antiferromagnetic ordering. On the other hand, undergoes a Jahn–Teller phase transition at a temperature of 310 K, differing from the low temperature ferrimagnetic transition temperature of about 60 K. It is also reported that shows another magnetic phase transition at about 30 K. These two phase transitions accompanying with the lattice change can be understood by the magneto-elastic interactions. Two interactions, the Jahn–Teller interaction and the spin-Peierls-like interaction are co-exist in system. In this report the compounds with x = 0.8, 0.6 and 1 are investigated by the X-ray diffraction measurements. From these measurements the crystal structures are determined. The full width at half maximum and integrated intensity give the fruitful information for magnetic elastic interactions.

show abstract

Low Temperature X-ray Diffraction Study of ZnCr2O4 and Ni0.5Zn0.5Cr2O4

Cited by 10 publications

References 12 publications

Fabrication of nanospinel ZnCr2O4 using sol–gel method and its application on removal of azo dye from aqueous solution

Fabrication of nanospinel ZnCr2O4 using sol–gel method and its application on removal of azo dye from aqueous solution

Facile size-controlled preparation of highly photocatalytically active ZnCr2O4 and ZnCr2O4/Ag nanostructures for removal of organic contaminants

Magneto-structural coupling in $$Ni_xZn_{1-x}Cr_2O_4$$ N i x Z n 1 - x C r 2 O 4

Contact Info

Product

Resources

About