Crystal structure, dielectric properties, and optical bandgap control in KNbO 3 –BiMnO 3 ceramics

PASCUAL‐GONZALEZ, Cristina, ELICKER, Carolina, MOREIRA, Mario L., CAVA, Sergio, STERIANOU, Iasmi, WANG, Dawei and FETEIRA, Antonio (2022). Crystal structure, dielectric properties, and optical bandgap control in KNbO 3 –BiMnO 3 ceramics. Journal of the American Ceramic Society. [Article]

Documents
30762:608503
[thumbnail of jace.18779.pdf]
Preview
PDF
jace.18779.pdf - Published Version
Available under License Creative Commons Attribution.

Download (1MB) | Preview
30762:608558
[thumbnail of Feteira-CrystalStructureDielectric(Supp).pdf]
Preview
PDF
Feteira-CrystalStructureDielectric(Supp).pdf - Supplemental Material
Available under License Creative Commons Attribution.

Download (564kB) | Preview
Abstract
Abstract: (1 − x)KNbO3–xBiMnO3 (0 ≤ x ≤ 0.25) ceramics were prepared by the solid‐state reaction method. An X‐ray diffraction analysis combined with Raman spectroscopy showed the co‐solubility of Bi and Mn in the orthorhombic structure to be less than 5% BiMnO3. Orthorhombic and pseudocubic symmetries coexist in the 0.05 ≤ x ≤ 0.15 region, coinciding with a bimodal grain size distribution. This coexistence of crystal symmetries is further corroborated by several anomalies in the dielectric behavior, which can be ascribed to structural phase transitions. For x ≥ 0.20, only one dielectric anomaly is detected around 100°C, which is commensurate with in situ Raman spectroscopy analysis. This work also shows that Bi/Mn co‐doping can be employed to tailor the bandgap of KNbO3, which narrows continuously with increasing x, resulting in ∼1‐eV narrowing for single‐phase x = 0.25. This may offer the possibility to employ this ferroic material in photoresponsive technologies.
More Information
Statistics

Downloads

Downloads per month over past year

Metrics

Altmetric Badge

Dimensions Badge

Share
Add to AnyAdd to TwitterAdd to FacebookAdd to LinkedinAdd to PinterestAdd to Email

Actions (login required)

View Item View Item