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

Conference: 2022: 72nd ACA Annual Meeting
Alicia Manjon Sanz Poster Author
Oak Ridge National Laboratory
Oak Ridge, TN 
 
Nagamalleswari Katragadda Additional Author
SRM University AP
Amaravati, Andhra Pradesh
 
Pranab Mandal Additional Author
SRM University AP
Amaravati, Andhra Pradesh
 
Premakumar Yanda Additional Author
School of Advanced Materials, Chemistry, and Physics of Materials Unit
Bangalore
 
A Sundaresan Additional Author
School of Advanced Materials, Chemistry, and Physics of Materials Unit
Bangalore
 
S. D. Kaushik Additional Author
UGC-DAE Consortium for Scientific Research Mumbai Centre
Mumbai
 
Weiguo Zhang Additional Author
University of Houston
Houston, TX 
 
P. Shiv Halasyamani Additional Author
University of Houston
Houston, TX 
 
07/30/2022: 5:30 PM - 7:30 PM
Poster Session 
Portland Marriott Downtown Waterfront 
Room: Exhibit Hall 

Description

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.