A Room temperature Polar and Weak-ferromagnetic Oxide with Low Dielectric Loss

Presented During:

07/30/2022: 5:30 PM - 7:30 PM
Portland Marriott Downtown Waterfront  


2022: 72nd ACA Annual Meeting

Session Type:


Presenting Author :

Alicia Manjon Sanz  
Oak Ridge National Laboratory

Additional Author(s):

Nagamalleswari Katragadda  
SRM University AP
Pranab Mandal  
SRM University AP
Premakumar Yanda  
School of Advanced Materials, Chemistry, and Physics of Materials Unit
A Sundaresan  
School of Advanced Materials, Chemistry, and Physics of Materials Unit
S. D. Kaushik  
UGC-DAE Consortium for Scientific Research Mumbai Centre
Weiguo Zhang  
University of Houston
P. Shiv Halasyamani  
University of Houston

Abstract Body:

Single-phase materials that are simultaneously ferroelectric and ferromagnetic at room temperature are promising for non-volatile random access memory devices. Perovskite BiFeO3 which crystallizes in the polar rhombohedral structure (R3c), is ferroelectric and antiferromagnetic at room temperature. Here, we report a family of perovskite oxides in the BiFeO3 – Bi2/3TiO3 – ATiO3 (where A2+ = Ca2+, Sr2+, Ba2+) ternary phase diagram that is polar as well as weak ferromagnetic. We achieved nearly pure A-site bismuth-based perovskite phase Bi0.9167R0.075Fe0.9Ti0.1O3 that crystallizes in the space group R3c similar to BiFeO3 as corroborated by powder X-ray and neutron diffraction analysis. Their polarity was confirmed by second harmonic generation (SHG) experiments. Room-temperature powder neutron diffraction confirms G-type antiferromagnetic ordering consistent with weak ferromagnetism that onsets at TN = 557 K. These perovskites show a low dielectric loss, and the electrical response is dominated by grain contributions below 723 K.

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