journal article·2015-07

Characterization of magnesium doped lanthanum orthoniobate synthesized by molten salt route

A. Mielewczyk-Gryn, S. Wachowski, K. Zagórski, P. Jasiński, M. Gazda

Ceramics International· Volume 41· Issue 6
Publisher page

Abstract

Abstract Molten salt synthesis method has been used to prepare the single phase magnesium doped lanthanum orthoniobate. The phase composition has been checked by X-ray diffraction method and the microstructure studies have been performed by scanning electron microscopy. The high temperature properties of the material have been investigated by thermogravimetry and electrochemical impedance spectroscopy. A dependence between sample total conductivity and temperature has been found supporting the thesis that there is strong correlation between apparent activation energy of conductivity and structural phase transition at ~500 °C. It has been also shown that the conductivity of magnesium doped lanthanum orthoniobate synthesized by the molten salt route reaches values of ~1 mS/cm at 720 °C in wet hydrogen.
Source: openaire · Quality: candidate unverified · Source record ↗

Research context

OpenAlex topics: Advancements in Solid Oxide Fuel Cells · Ferroelectric and Piezoelectric Materials · Magnetic and transport properties of perovskites and related materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

References (41)

Show source-provided references
1. Luminescence phenomena in compounds with fergusonite structure10.1016/0022-2313(70)90011-6 ↗
2. Infrared-excited visible luminescence in oxidic lattices doped with Yb3+ and Er3+10.1016/0022-2313(71)90041-X ↗
3. Influence of host lattice on the infrared-excited visible luminescence in Yb3+, Er3+-doped oxides10.1016/0022-2313(72)90021-X ↗
4. Influence of the host lattice on the infrared-excited blue luminescence of Yb3+, Tm3+-doped compounds10.1016/0022-2313(73)90098-7 ↗
5. Luminescence processes in niobates with fergusonite structure10.1016/S0022-2313(76)90792-4 ↗
6. Rare earth niobate systems and the phosphor GdNbO4:Bi10.1016/0022-4596(76)90137-7 ↗
7. Ferroelasticity in the LnNbO4-type rare earth niobates10.1016/0025-5408(77)90084-8 ↗
8. Growth and properties of LaNbO4 and NdNbO4 single crystals10.1016/0022-0248(77)90372-4 ↗
9. Study on the room temperature phase of LaNbO4 crystals10.1016/0025-5408(77)90037-X ↗
10. Phase diagrams and structures under pressure – an index of substances10.1016/0079-6786(79)90005-0 ↗
11. Bevan · 1979
12. Raman and luminescence studies on phase transition of EuNbO4 under high pressure10.1016/S1002-0721(14)60141-1 ↗
13. Promising red phosphors LaNbO4:Eu3+, Bi3+ for LED solid-state lighting application10.1016/S1002-0721(09)60111-3 ↗
14. Electron back scattering study of domain structure in monoclinic phase of a rare-earth orthoniobate LaNbO410.1016/0956-7151(95)90172-8 ↗
15. Structure and luminescent properties of LaNbO4 synthesized by sol–gel process10.1016/j.jlumin.2007.01.005 ↗
16. Matrix induced synthesis of LaNbO4:Tb3+ phosphors by in situ composing hybrid precursors10.1016/j.optmat.2005.03.011 ↗
17. Acoustic mode in the ferroelastic phase transition of LaNbO410.1143/JPSJ.54.1168 ↗
18. Pretransitional phenomena at the first-order phase transition in LaNbO410.1143/JPSJ.64.3798 ↗
19. High temperature monoclinic-to-tetragonal phase transition in magnesium doped lanthanum ortho-niobate10.1016/j.ceramint.2012.09.102 ↗
20. Nano- and microcrystals of doped niobates10.1002/crat.201000378 ↗
21. Investigation of the high temperature structural behavior of La0.99Ca0.01NbO4 proton conducting material10.1016/j.jallcom.2008.08.032 ↗
22. Solid solubility and phase transitions in the system LaNb1−xTaxO410.1016/j.jssc.2008.06.032 ↗
23. Effect of isovalent substitution on microstructure and phase transition of LaNb1−xMxO4 (M=Sb, V or Ta; x=0.05–0.3)10.1016/j.jssc.2014.07.041 ↗
24. Defects, dopants, and protons in LaNbO410.1021/cm1018822 ↗
25. Structure and electrical properties of ceramic proton conductors obtained with molten-salt and solid-state synthesis methods10.1016/j.jnoncrysol.2010.05.068 ↗
26. Cathode compatibility, operation, and stability of LaNbO4-based proton conducting fuel cells10.1016/j.ssi.2013.12.009 ↗
27. Proton conduction in rare-earth ortho-niobates and ortho-tantalates10.1038/nmat1591 ↗
28. Development of proton conducting SOFCs based on LaNbO4 electrolyte – status in Norway10.1002/fuce.201000052 ↗
29. Hydrogen permeation, transport properties and microstructure of Ca-doped LaNbO4 and LaNb3O9 composites10.1016/j.memsci.2012.06.008 ↗
30. Effects of A and B site acceptor doping on hydration and proton mobility of LaNbO410.1016/j.ijhydene.2011.10.020 ↗
31. Proton conducting ceramic powder synthesis by a low temperature method10.1166/jnn.2015.9858 ↗
32. Janz · 2013
33. Effect of Ca doping on the electrical conductivity of the high temperature proton conductor LaNbO410.1016/j.ijhydene.2012.06.014 ↗
34. Proton content and nature in perovskite ceramic membranes for medium temperature fuel cells and electrolysers10.3390/membranes2030493 ↗
35. Synthesis and characterization of carbon dioxide and boiling water stable proton conducting double perovskite-type metal oxides10.1016/j.jpowsour.2008.09.110 ↗
36. X-ray, SEM and thermal analysis of RNbO4-type fergusonites10.1007/BF01689309 ↗
37. Proton conducting alkaline earth zirconates and titanates for high drain electrochemical applications10.1016/S0167-2738(01)00953-5 ↗
38. A temperature programmed desorption investigation on the interaction of Ba0.5Sr0.5Co0.8Fe0.2O3−δ perovskite oxides with CO2 in the absence and presence of H2O and O210.1016/j.apcatb.2007.11.007 ↗
39. Low temperature sintering of LaNbO4 proton conductors from freeze-dried precursors10.1016/j.jeurceramsoc.2011.11.027 ↗
40. Functional properties of La0.99X0.01Nb0.99Al0.01O4−δ and La0.99X0.01Nb0.99Ti0.01O4−δ proton conductors where X is an alkaline earth cation10.1016/j.jeurceramsoc.2014.11.009 ↗
41. Proton mobility through a second order phase transition: theoretical and experimental study of LaNbO410.1039/c002851g ↗