Order—Disorder transformation and its effect on the properties of (Lanthanide)2Zr1.5Hf0.5O7 functional nanoceramics
Source abstract
Abstract
Abstract Order disorder transformations and its effect on the structural, optical and ionic transport properties of the cubic pyrochlore – defect fluorite structures are the prime focus of this study. Nanoceramics of Ln2Zr1.5Hf0.5O7 (Ln = Pr, Nd, Sm, Gd, Dy and Er) are prepared through the modified combustion technique. X – ray diffraction analysis and electron microscopic studies show the cubic nano crystallite nature of the materials. Vibrational studies reveal the pyrochlore–fluorite phase transformation in the series. Highly dense bulk ceramics are prepared from the nano particles at relatively low temperatures. The gradual replacement of Ln3+ ions in Ln2Zr1.5Hf0.5O7 changes the pyrochlores (Ln = Pr-Sm) to defect fluorite (Ln = Er) through the weakly ordered defect fluorites (Ln = Gd and Dy). Impedance spectroscopic analysis carried on the bulk ceramics shows the influence of phase transformation on the oxide ion conduction of bulk materials. The peak oxide ion conduction is observed for the Ln = Dy ceramic, which is at the pyrochlore fluorite phase boundary.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Nuclear materials and radiation effects · Nuclear Materials and Properties · Recycling and utilization of industrial and municipal waste in materials production
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (41)
Show source-provided references
1. Poole · 2003
2. Oxide pyrochlores - A review10.1016/0079-6786(83)90001-8 ↗
3. Luminescence as an indication of distortion in A3+2B4+2O7 type pyrochlores10.1016/0022-2313(73)90046-X ↗
4. Transparent La2-xGdxZr2O7 ceramics obtained by combustion method and vacuum sintering10.1016/j.jallcom.2013.09.187 ↗
5. Low temperature solid oxide electrolytes (LT-SOE): a review10.1016/j.jpowsour.2016.11.019 ↗
6. Borosilicate and lead silicate glass matrix composites containing pyrochlore phases for nuclear waste encapsulation
7. Preparation and thermophysical properties of CeO2 doped La2Zr2O7 ceramic for thermal barrier coatings10.1016/j.jallcom.2006.08.005 ↗
8. A critical review of existing criteria for the prediction of pyrochlore formation and stability10.1021/acs.inorgchem.8b01665 ↗
9. Electrical conductivity anomaly around fluorite – pyrochlore phase boundary10.1016/S0167-2738(02)00874-3 ↗
10. Order-disorder transformation and enhanced oxide-ionic conductivity of (Sm1-xDyx)2Zr2O7 ceramics10.1016/j.jpowsour.2010.09.056 ↗
11. Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides10.1107/S0567739476001551 ↗
12. Relationship between oxide-ion conductivity and dielectric relaxation in the Ln2Zr2O7 system having pyrochore-type compositions (Ln=Yb, Y, Gd, Eu, Sm, Nd, La)10.1016/j.jpcs.2007.12.015 ↗
13. Effect of fl uorite phase on the electrical conductivity of (Sm1−xDy x)2Zr2O7 pyrochlore
14. Preparation and improved grain conductivity of (Sm1−xY x)2Zr2O7 ceramics10.1149/1.3292284 ↗
15. Room-temperature synthesis and conductivity of the pyrochlore type Dy2(Ti1−yZry)2O7 (0⩽y⩽1) (0⩽y⩽1) solid solution10.1016/j.jssc.2005.12.015 ↗
16. New solid electrolytes of the pyrochlore family10.1134/S1023193512010144 ↗
17. Structural, optical and impedance spectroscopic characterizations of RE2Zr2O7 (RE = La, Y) ceramics10.1016/j.ssi.2018.05.025 ↗
18. X-ray line broadening from filed aluminium and wolfram10.1016/0001-6160(53)90006-6 ↗
19. Rare‐earth titanates and stannates of pyrochlore structure; vibrational spectra and force fields10.1002/jrs.1250140202 ↗
20. Order–disorder transition in Nd2−yGdyZr2O7 pyrochlore solid solution: an X-ray diffraction and Raman spectroscopic study10.1016/j.jssc.2007.07.007 ↗
21. Preparation, characterization, and ionic transport properties of nanoscale Ln2Zr2O7 (Ln = Ce, Pr, Nd, Sm, Gd, Dy, Er, and Yb) energy materials
22. Structural and photoluminescence features of Pr 3+ -activated different alkaline sodium-phosphate-phosphors10.1016/j.jallcom.2016.06.064 ↗
23. Synthesis of praseodymium oxide nanofiber by electrospinning10.1016/j.spmi.2011.05.010 ↗
24. The nature of Pr-ZrSiO4 yellow ceramic pigment10.1023/A:1014537000690 ↗
25. States in the gap10.1016/0022-3093(72)90194-9 ↗
26. Rapid preparation and characterization of Dy2Zr2O7 nanocrystals10.1016/j.materresbull.2007.10.017 ↗
27. Photoelectrochemical study of lanthanide zirconium oxides, Ln2Zr2O7 (Ln=La, Ce, Nd and Sm)10.1016/j.jallcom.2005.10.072 ↗
28. Optical spectra of Ln3+(Nd3+, Sm3+, Dy3+, Ho3+, Er3+)-doped Y3GaO610.1016/j.jlumin.2004.06.005 ↗
29. Photoluminescence characteristics of Sm3+ doped Ba3La(PO4)3 as new orange-red emitting phosphors10.1016/j.jlumin.2013.08.049 ↗
30. Systematic research on RE2Zr2O7 (RE = La, Nd, Eu and Y) nanocrystals: preparation, structure and photoluminescence characterization10.1016/j.solidstatesciences.2007.07.037 ↗
31. Investigation of new UV-emitting, Gd-activated Y4Zr3O12 phosphors prepared via combustion method10.1016/j.jlumin.2014.08.004 ↗
32. Photoluminescence characterization of Dy3+ and Eu2+ ion in M5(PO4)3F (M=Ba, Sr, Ca) phosphors10.1016/j.jallcom.2009.03.069 ↗
33. Structural ceramic nanocomposites: a review of properties and powders’ synthesis methods10.3390/nano5020656 ↗
34. Riedel · 2013
35. Electrode-contact spreading resistance phenomena in doped-lanthanum gallate ceramics10.1023/A:1014435112280 ↗
36. Cation size effects in oxygen ion dynamics of highly disordered pyrochlore-type ionic conductors10.1103/PhysRevB.78.104304 ↗
37. Study of electrical conductivity of Ca-substituted La2Zr2O710.1016/j.materresbull.2013.04.081 ↗
38. Influence of the chemical composition on structural properties and electrical conductivity of Y-Ce-ZrO210.1021/cm070319j ↗
39. High ionic conductivity in the pyrochlore-type Gd2−yLayZr2O7 solid solution (0 ≤ y ≤ 1)10.1016/j.ssi.2008.07.015 ↗
40. Electrical and thermophysical properties of mechanochemically obtained lanthanide hafnates10.1111/jace.14712 ↗
41. Structural, optical and ionic transport properties of Dy2-xLaxZr2O7 nanoceramics10.1016/j.jallcom.2018.08.091 ↗