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Synthesis and characterization of BaTi1−xNbxO3 ferroelectric perovskite oxides with tunable band gap, anomalous photovoltage, and enhanced energy storage
Ist Teil von
Journal of materials science. Materials in electronics, 2024-05, Vol.35 (13), p.912
Ort / Verlag
New York: Springer US
Erscheinungsjahr
2024
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
In this study, we investigated dense BaTi
1−
x
Nb
x
O
3
ceramics prepared by the conventional solid-state reaction technique which shows energy storage properties and anomalous photovoltaic effect. Structural analysis of BaTi
1−
x
Nb
x
O
3
compositions has been performed by fitting the XRD patterns with Rietveld method and all samples show coexisting tetragonal (P4 mm) and cubic (Pm-3 m) structures. Composition (
x
= 0.04) shows minimum band gap (2.4 eV), smaller than pure BaTiO
3
ceramics which can be attributed to lattice distortion and oxygen vacancies. The improved breakdown strength and energy storage density is achieved for BaTi
0.93
Nb
0.07
O
3
composition. This ferroelectric ceramic shows energy storage of 278.7 mJ/cm
2
and high energy conversion efficiency (90.4%). The composition (
x
= 0.07) exhibit a very high photovoltage (26 V) under visible light wavelength. These findings provide a fresh approach to create high-performance functional ferroelectric materials for energy applications.