| Title: |
Anomalous structural behavior and antiferroelectricity in BiGdO$_{3}$: Detailed temperature and high pressure study |
| Authors: |
Jana, Rajesh; Dutta, Apurba; Saha, Pinku; Mandal, Kapil; Ghosh, Bishnupada; Chandra, Amreesh; Das, I.; Mukherjee, Goutam Dev |
| Publication Year: |
2020 |
| Collection: |
Condensed Matter |
| Subject Terms: |
Condensed Matter - Materials Science |
| Description: |
A detailed temperature and pressure investigation on BiGdO$_{3}$ is carried out by means of dielectric constant, piezoelectric current, polarization-electric field loop, Raman scattering and x-ray diffraction measurements. Temperature dependent dielectric constant and dielectric loss show two anomalies at about 290 K (T$_r$) and 720 K (T$_C$). The later anomaly is most likely due to antiferroelectric to paraelectric transition as hinted by piezoelectric current and polarization-electric field loop measurements at room temperature, while the former anomaly suggests reorientation of polarization. Cubic to orthorhombic structural transition is observed at about 10 GPa in high pressure x-ray diffraction studies accompanied by anisotropic lattice parameter changes. An expansion about 30 % along $a$-axis and 15 % contraction along $b$-axis during the structural transition result in 9.5 % expansion in unit cell volume. This structural transition is corroborated by anomalous softening and large increase in full width half maximum (FWHM) of 640 cm$^{-1}$ Raman mode above 10 GPa. Enhancement of large structural distortion and significant volume expansion during the structural transition indicate towards an antiferroelectric to ferroelectric transition in the system.; Comment: 20 pages, 7 figures |
| Document Type: |
Working Paper |
| DOI: |
10.1088/1361-648X/ac2646 |
| Access URL: |
http://arxiv.org/abs/2002.09332 |
| Accession Number: |
edsarx.2002.09332 |
| Database: |
arXiv |