Structure and Thermal Expansion of YSZ and La 2 Zr 2 O 7 Above 1500°C from Neutron Diffraction on Levitated Samples
High‐temperature time‐of‐flight neutron diffraction experiments were performed on cubic yttria‐stabilized zirconia (YSZ, 10 mol% YO 1.5 ) and lanthanum zirconate (LZ) prepared by laser melting. Three spheroids of each composition were aerodynamically levitated and rotated in argon flow and heated wi...
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| Published in | Journal of the American Ceramic Society Vol. 98; no. 10; pp. 3381 - 3388 |
|---|---|
| Main Authors | , , , |
| Format | Journal Article |
| Language | English |
| Published |
01.10.2015
|
| Online Access | Get full text |
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| Abstract | High‐temperature time‐of‐flight neutron diffraction experiments were performed on cubic yttria‐stabilized zirconia (YSZ, 10 mol% YO
1.5
) and lanthanum zirconate (LZ) prepared by laser melting. Three spheroids of each composition were aerodynamically levitated and rotated in argon flow and heated with a CO
2
laser. Unit cell, positional and atomic displacement parameters were obtained by Rietveld analysis. Below ~1650°C the mean thermal expansion coefficient (TEC) for YSZ is higher than for LZ (13 ± 1 vs. 10.3 ± 0.6) × 10
−6
/K. From ~1650°C to the onset of melting of LZ at ~2250°C, TEC for YSZ and LZ are similar and within (7 ± 2) × 10
−6
/K. LZ retains the pyrochlore structure up to the melting temperature with Zr coordination becoming closer to perfectly octahedral. Congruently melting LZ is La deficient. The occurrence of thermal disordering of oxygen sublattice (Bredig transition) in defect fluorite structure was deduced from the rise in YSZ TEC to ~25 × 10
−6
/K at 2350°C–2550°C with oxygen displacement parameters (
U
iso
) reaching 0.1 Å
2
, similar to behavior observed in UO
2
. Acquisition of powder‐like high‐temperature neutron diffraction data from solid‐levitated samples is feasible and possible improvements are outlined. This methodology should be applicable to a wide range of materials for high‐temperature applications. |
|---|---|
| AbstractList | High‐temperature time‐of‐flight neutron diffraction experiments were performed on cubic yttria‐stabilized zirconia (YSZ, 10 mol% YO
1.5
) and lanthanum zirconate (LZ) prepared by laser melting. Three spheroids of each composition were aerodynamically levitated and rotated in argon flow and heated with a CO
2
laser. Unit cell, positional and atomic displacement parameters were obtained by Rietveld analysis. Below ~1650°C the mean thermal expansion coefficient (TEC) for YSZ is higher than for LZ (13 ± 1 vs. 10.3 ± 0.6) × 10
−6
/K. From ~1650°C to the onset of melting of LZ at ~2250°C, TEC for YSZ and LZ are similar and within (7 ± 2) × 10
−6
/K. LZ retains the pyrochlore structure up to the melting temperature with Zr coordination becoming closer to perfectly octahedral. Congruently melting LZ is La deficient. The occurrence of thermal disordering of oxygen sublattice (Bredig transition) in defect fluorite structure was deduced from the rise in YSZ TEC to ~25 × 10
−6
/K at 2350°C–2550°C with oxygen displacement parameters (
U
iso
) reaching 0.1 Å
2
, similar to behavior observed in UO
2
. Acquisition of powder‐like high‐temperature neutron diffraction data from solid‐levitated samples is feasible and possible improvements are outlined. This methodology should be applicable to a wide range of materials for high‐temperature applications. |
| Author | Neuefeind, Joerg C. Ushakov, Sergey V. Navrotsky, Alexandra Weber, Richard J. K. |
| Author_xml | – sequence: 1 givenname: Sergey V. surname: Ushakov fullname: Ushakov, Sergey V. organization: Peter A. Rock Thermochemistry Laboratory and Neat ORU University of California Davis One Shields Avenue Davis California 95616 – sequence: 2 givenname: Alexandra surname: Navrotsky fullname: Navrotsky, Alexandra organization: Peter A. Rock Thermochemistry Laboratory and Neat ORU University of California Davis One Shields Avenue Davis California 95616 – sequence: 3 givenname: Richard J. K. surname: Weber fullname: Weber, Richard J. K. organization: Materials Development, Inc. 3090 Daniels Court Arlington Heights Illinois 60004 – sequence: 4 givenname: Joerg C. surname: Neuefeind fullname: Neuefeind, Joerg C. organization: Chemical and Engineering Materials Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 |
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| Title | Structure and Thermal Expansion of YSZ and La 2 Zr 2 O 7 Above 1500°C from Neutron Diffraction on Levitated Samples |
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