Absence of room temperature ferromagnetism in Fe stabilized ZrO2 nanostructures and effect of Fe doping on its structural, optical and luminescence properties

Effect of doping location induced anisotropy on thermophysical properties of dilute Fe2O3‐Y2O3‐ZrO2 solid solutions

“…The calculation process can be found in Appendix . The calculated plane strains and plane stresses of the investigated specimens are comparable to the reported values (represented by the plotting of black square symbols), measured directly by using XRD 12,20 . Figure 10C shows the coercive strain () and coercive stress () of the FeY‐TZP compounds calculated based on the plane stresses of Figure 10B.…”

“…Our earlier studies 19 reported that the Fe dopant existed both substitutional and interstitial locations of Y‐TZP crystals, which considerably improved densification rate and triggered distinctive optical properties. Comparison between reports 19–24 and our results 19 suggests that different precursors and calcination sequences of the Fe 2 O 3 ‐Y 2 O 3 ‐ZrO 2 solids can yield distinct doping sites going with different electronic valences (substitution vs. interstitial, and Fe 3+ vs. Fe 2+ ). Nevertheless, research activities on multielement doping location are essential, as only little is known, which is by far not sufficient to predict their overall thermophysical properties.…”

“…The Fe 3+ ion changes into Fe 2+ under production of internal stress derived from Fe 3+ ion replacing Zr 4+ ion, and the electron exchange prefers to occur between adjacent ions, which is well‐reported in 4f‐3d/5d transition metal oxides, for instance Ti, Mn and Ce 25,28,30,31 . Studies by using Mössbauer spectroscopy 23 and X‐ray absorption fine structure 12,20,22 asserted that Fe 2+ interstitial prefers to settle in the central interval in the ZrO 2 crystal in form of Zr‐Fe bond, while Fe 3+ resides the host Zr 4+ site. Considerable Raman mode shift and peak broadening shown at low frequencies in Figure 3 and Figure a,b could be the evidences to support there are new metal‐metal bonds (i.e., Zr‐Fe or Fe‐Fe), because low frequencies in Raman spectra represent phonon vibration of zirconium lattice rather than oxygen sublattice at room temperature 35 …”

Advances in biocermets for bone implant applications

“…At present, metallic elements are widely used as stabilizers to accomplish the phase transformation of ZrO 2 at room temperature, including Mg, calcium (Ca), yttrium (Y), cerium (Ce), lanthanum (La), etc. [47][48][49]. For example, Ponnilavan et al [50] investigated the effect of rare-earth substitutions on the performance of ZrO 2 -Al 2 O 3 for biomedical applications and found that the combinations of Gd and Dy in ZrO 2 -Al 2 O 3 displayed better mechanical properties due to the phase transformation.…”

New modeling of AgFeNi2S4-graphene-TiO2 ternary nanocomposite with chelate compounds and its photocatalytic reduction of CO2

“…The emission peak of the metal-based composite was classi ed in two sector: (1) UV emission (NBE), (2) Visible emission (DF defect) [32]. The PL intensity of pure AFNS was high because of rapid charge recombination.…”