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A neutron powder investigation of the high-temperature structure and phase transition in stoichiometric LiNbO3

Abstract:

The structural changes of stoichiometric LiNbO3 at temperatures up to 1470 K have been investigated by neutron powder diffraction. At Tc ≈ 1460 K, LiNbO3 transforms from a paraelectric high-temperature (R3̄c) to a ferroelectric low temperature structure (R3c). The phase transition is of coupled order-disorder and displacive type. In the high-temperature phase, Li is highly disordered over two off-centre positions, whereas Nb takes a centrosymmetric position within O6 octahedra. An analysis of...

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Publication status:
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Journal:
ZEITSCHRIFT FUR KRISTALLOGRAPHIE More from this journal
Volume:
212
Issue:
10
Pages:
712-719
Publication date:
1997-01-01
DOI:
ISSN:
0044-2968
Language:
English
Pubs id:
pubs:146784
UUID:
uuid:6c02d607-9dc4-432c-8853-3b7384260ca9
Local pid:
pubs:146784
Source identifiers:
146784
Deposit date:
2012-12-19

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