Hydrothermal synthesis of OAurivillius phase: A comparative study of A-site cation size on structure, dielectric, optical properties
In this study, the double-layered Aurivillius phases CaBi2Ta2O9 (CBT) and PbBi2Ta2O9 (PBT) were prepared through a hydrothermal route with NaOH as a mineralizer. XRD analysis confirmed that the CBT and PBT compounds were successfully formed and adopted an orthorhombic crystal structure with an [Form...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
World Scientific Publishing
2022-04-01
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| Series: | Journal of Advanced Dielectrics |
| Subjects: | |
| Online Access: | https://www.worldscientific.com/doi/10.1142/S2010135X21500302 |
| Summary: | In this study, the double-layered Aurivillius phases CaBi2Ta2O9 (CBT) and PbBi2Ta2O9 (PBT) were prepared through a hydrothermal route with NaOH as a mineralizer. XRD analysis confirmed that the CBT and PBT compounds were successfully formed and adopted an orthorhombic crystal structure with an [Formula: see text]21am symmetry. Le Bail refinements of XRD data indicated that the unit cell volume of CBT was smaller than PBT and is associated with the smaller ionic radius of [Formula: see text] compared to [Formula: see text]. The surface morphology of both samples, as determined using SEM, demonstrated plate-like grains with anisotropic grain growth. It was found that the different ionic radii of [Formula: see text]-site cations ([Formula: see text] and [Formula: see text] strongly affected the structural, optical and electrical properties of the Aurivillius phase. The occupation of smaller [Formula: see text] cations induced a higher structural distortion, which resulted in higher bandgap ([Formula: see text] energy and ferroelectric transition temperature ([Formula: see text] of CBT, compared to those of PBT. |
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| ISSN: | 2010-135X 2010-1368 |