Ferroelectric properties of tetragonal (BaZrO3)1/(PbZrO3)n and (SrZrO3)1/(PbZrO3)n superlattices are studied as the ratio of PbZrO3 was changed (n = 1–3) in the superlattices using density functional theory (DFT) method as well as an electrostatic model. We show that PbZrO3—an antiferroelectric in bulk displays ferroelectric behavior in the superlattices combined with the paraelectric cubic (BaZrO3) or (SrZrO3). The electrostatic model and the DFT calculations show that the polarization and the tetragonality (c/a ratio) are reduced in the BaZrO3/PbZrO3 and SrZrO3/PbZrO3 superlattices with respect to the bulk tetragonal PbZrO3. Moreover, the polarization and the tetragonality of superlattices increase with increasing the fraction of PbZrO3 in superlattices. The estimated polarization of the (BaZrO3)1/(PbZrO3)1 superlattice is (36.21 μC/cm2), while it is (56.82 μC/cm2) for the (BaZrO3)1/(PbZrO3)3 superlattice. The estimated polarization of the (SrZrO3)1/(PbZrO3)1 superlattice is (55.28 μC/cm2), while it is (64.86 μC/cm2) for the (SrZrO3)1/(PbZrO3)3 superlattice. These ferroelectric superlattices have good lattice matching with many Heusler alloys and they could be very useful as ferroelectric substrates to these systems.
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21 August 2014
Research Article|
August 21 2014
Ferroelectric properties of BaZrO3/PbZrO3 and SrZrO3/PbZrO3 superlattices: An ab-initio study
Nabil Al-Aqtash;
Nabil Al-Aqtash
1
University of Nebraska at Omaha
, Omaha, Nebraska 68182, USA
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Ahmad Alsaad;
Ahmad Alsaad
1
University of Nebraska at Omaha
, Omaha, Nebraska 68182, USA
2
Jordan University of Science and Technology
, Irbid 22110, Jordan
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Renat Sabirianov
Renat Sabirianov
1
University of Nebraska at Omaha
, Omaha, Nebraska 68182, USA
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Nabil Al-Aqtash
1
Ahmad Alsaad
1,2
Renat Sabirianov
1
1
University of Nebraska at Omaha
, Omaha, Nebraska 68182, USA
2
Jordan University of Science and Technology
, Irbid 22110, Jordan
J. Appl. Phys. 116, 074112 (2014)
Article history
Received:
June 05 2014
Accepted:
August 04 2014
Citation
Nabil Al-Aqtash, Ahmad Alsaad, Renat Sabirianov; Ferroelectric properties of BaZrO3/PbZrO3 and SrZrO3/PbZrO3 superlattices: An ab-initio study. J. Appl. Phys. 21 August 2014; 116 (7): 074112. https://doi.org/10.1063/1.4893300
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