Phase transition in LAMOX type compounds
La 2 Mo 2 O 9 (LMO) was synthesized at lower temperature 973 K (LT-phase) by ceramic route. Differential thermal analysis (DTA) scan of LT-phase of LMO showed α→β transition at 843 K during heating and β→α conversion via a metastable γ-phase during cooling. This was also confirmed by thermo-dilatome...
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| Veröffentlicht in: | Journal of thermal analysis and calorimetry 2009-05, Vol.96 (2), p.463-468 |
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| Hauptverfasser: | , , |
| Format: | Artikel |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext |
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| Zusammenfassung: | La
2
Mo
2
O
9
(LMO) was synthesized at lower temperature 973 K (LT-phase) by ceramic route. Differential thermal analysis (DTA) scan of LT-phase of LMO showed α→β transition at 843 K during heating and β→α conversion via a metastable γ-phase during cooling. This was also confirmed by thermo-dilatometry and impedance spectroscopy. La
2
Mo
1.95
V
0.05
O
9-δ
(LMVO), La
1.96
Sr
0.04
Mo
2
O
9-δ
(LSMO) and La
1.96
Sr
0.04
Mo
1.95
V
0.05
O
9-δ
(LSMVO) were prepared in a similar way. These compounds exhibited α→β transition on heating with shift in transition temperature, but the existence of γ-phase during cooling disappeared. Substitution increased the ionic conductivity of α-phase and reduced that of β-phase. |
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| ISSN: | 1388-6150 1588-2926 1572-8943 |
| DOI: | 10.1007/s10973-008-9532-y |