Crystal structure of metastable perovskite Bi(Mg1/2Ti1/2)O-3: Bi-based structural analogue of antiferroelectric PbZrO3
authors Khalyavin, DD; Salak, AN; Vyshatko, NP; Lopes, AB; Olekhnovich, NM; Pushkarev, AV; Maroz, II; Radyush, YV
nationality International
journal CHEMISTRY OF MATERIALS
keywords MORPHOTROPIC PHASE-BOUNDARY; GROUP-THEORETICAL ANALYSIS; LEAD-FREE; PIEZOELECTRIC SYSTEM; SOLID-SOLUTION; TEMPERATURE; DIFFRACTION; CERAMICS
abstract A metastable perovskite phase of Bi(Mg1/2Ti1/2)O-3 composition (BMT) has been obtained under high-pressure (6 GPa) and high-temperature (1270 K) conditions. X-ray and electron diffraction studies have revealed a complex superstructure originating from antiferroelectric-like displacements of Bi3+ cations and octahedral tilting. A group theoretical analysis was used to enumerate the possible crystal structures compatible with both types of the distortions. On the basis of the symmetry arguments in combination with the diffraction methods, it has been concluded that the perovskite BMT is characterized by the orthorhombic Pnnm space group with unit cell parameters a = 11.3207(10) angstrom, b = 5.6433(10) angstrom, and c = 7.8314(10) angstrom. A relation of the BMT crystal structure to that commonly accepted for antiferroelectric perovskite PbZrO3 (PZ) is discussed.
publisher AMER CHEMICAL SOC
issn 0897-4756
year published 2006
volume 18
issue 21
beginning page 5104
ending page 5110
digital object identifier (doi) 10.1021/cm061129w
web of science category Chemistry, Physical; Materials Science, Multidisciplinary
subject category Chemistry; Materials Science
unique article identifier WOS:000241106800020
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