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231222s2003 xx ||||| 00| ||eng c |
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|a pubmed25n0416.xml
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|a (NLM)12714752
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|a DE-627
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|c DE-627
|e rakwb
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|a eng
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|a Ali, Roushown
|e verfasserin
|4 aut
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|a Lattice parameters and structural phase transition of lanthanum titanate perovskite, La0.68(Ti0.95,Al0.05)O3
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| 264 |
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|c 2003
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|a Band
|b nc
|2 rdacarrier
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|a Date Completed 02.10.2003
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|a Date Revised 05.06.2019
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a Lattice parameters and the structural phase transition of La(0.68)(Ti(0.95),Al(0.05))O(3) have been investigated in situ in the temperature range 301-689 K by the synchrotron radiation powder diffraction (SR-PD) technique. High-angular-resolution SR-PD is confirmed to be a powerful technique for determining precise lattice parameters around a phase-transition temperature. The title compound exhibits a reversible phase transition between orthorhombic and tetragonal phases at 622.3 +/- 0.6 K. The following results were obtained: (i) the lattice parameters increased continuously with temperature, while the b/a ratio decreased continuously with temperature and became unity at the orthorhombic-tetragonal transition point; (ii) no hysteresis was observed between the lattice-parameter values measured on heating and on cooling. Results (i) and (ii) indicate that the orthorhombic-tetragonal phase transition is continuous and reversible. The b/a ratio is found to exhibit a more continuous temperature evolution than does the order parameter for a typical second-order phase transition based on Landau theory
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|a Journal Article
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|a Yashima, Masatomo
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Journal of synchrotron radiation
|d 1999
|g 10(2003), Pt 3 vom: 01. Mai, Seite 228-32
|w (DE-627)NLM09824129X
|x 0909-0495
|7 nnns
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| 773 |
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|g volume:10
|g year:2003
|g number:Pt 3
|g day:01
|g month:05
|g pages:228-32
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|a GBV_ILN_350
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|a GBV_ILN_2005
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|a AR
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| 952 |
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|d 10
|j 2003
|e Pt 3
|b 01
|c 05
|h 228-32
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