Ferroelectric interaction and polarization studies in BaTiO3/SrTiO3 superlattice

Sarkar, Asis; Krupanidhi, S. B.

doi:doi:10.1063/1.2724822

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Barrier discharges in cellular polypropylene ferroelectrets: How do they influence the electromechanical properties?

Ferroelectrets (i.e., charged cellular polymers) are rendered piezoelectric by means of barrier discharges inside the air-filled voids. The light emission from barrier discharges in cellular polypropylene ferroelectrets was quantitatively studied. Light emission typically occurs above a threshold voltage of 3 kV and then significantly increases with the applied voltage. Time-resolved images reveal discharge processes in individual voids. In addition, a second “back discharge” emission is observ...

Dielectric and structural studies of Ba₂MTi₂Nb₃O₁₅ (BMTNO₁₅, M = Bi³⁺,La³⁺,Nd³⁺,Sm³⁺,Gd³⁺) tetragonal tungsten bronze-structured ceramics

The structure and dielectric properties of a new family of tetragonal tungsten bronze (TTB) ceramics with the general formula, Ba2MTi2Nb3O15 where M = Bi3+,La3+,Nd3+,Sm3+,Gd3+, have been investigated. Hereafter the compositions will be referred to by the abbreviation BMTNO15 where M = B(Bi3+), L(La3+), N(Nd3+), S(Sm3+) or G(Gd3+). BLTNO15 [permittivity maximum (Tm) ∼ −80 °C] and BBTNO15 (Tm ∼ −100 °C) exhibited relaxorlike dielectric behavior. In contrast, BNTNO15 (Tm ∼ 165 °C), BSTNO15 (Tm ∼ 2...

Ferroelectric superlattice structures consisting of alternating layers of BaTiO₃ and SrTiO₃ with variable interlayer thickness were grown on Pt (111)/TiO₂/SiO₂/Si (100) substrates by pulsed laser deposition. The presence of superlattice reflections in the x-ray diffraction pattern clearly showed the superlattice behavior of the fabricated structures over a range of 6.4–20 nm individual layer thicknesses. Depth profile conducted by secondary ion mass spectrometry analysis showed a periodic concentration of Ba and Sr throughout the film. Polarization hysteresis and the capacitance-voltage characteristics of these films show clear size dependent ferroelectric characteristics. The spontaneous (P_s) and remnant (P_r) polarizations increase gradually with decreasing periodicity, reach a maximum at a finite thickness and then decrease. The competition between the size effect and long-range ferroelectric interaction is suggested as a possible reason for this phenomenon. The temperature dependence of P_s and P_r shows a single ferroelectric phase transition, and the Curie temperature is estimated to be about 316 K. The curve shows that the ferroelectric superlattice tends to form an artificial material, responding as a single structure with an averaged behavior of both the parent systems.

Article Outline

INTRODUCTION
EXPERIMENTAL DETAILS
RESULTS AND DISCUSSION
1. X-ray diffraction
2. SIMS analysis
3. Hysteresis (P-E) and capacitance-voltage (C-V) measurements
CONCLUSIONS

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KEYWORDS and PACS

Keywords

barium compounds, strontium compounds, ferroelectric materials, ferroelectric thin films, superlattices, pulsed laser deposition, dielectric polarisation, dielectric hysteresis, X-ray diffraction, secondary ion mass spectra, capacitance, ferroelectric transitions, ferroelectric Curie temperature

PACS

77.55.-g

Dielectric thin films
77.84.Ek

Niobates and tantalates
77.84.Cg

PZT ceramics and other titanates
77.80.Dj

Domain structure; hysteresis
77.80.B-

Phase transitions and Curie point
77.22.Ej

Polarization and depolarization
82.80.Ms

Mass spectrometry (including SIMS, multiphoton ionization and resonance ionization mass spectrometry, MALDI)

ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1063/1.2724822

PUBLICATION DATA

ISSN

0021-8979 (print)

1089-7550 (online)

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$abstract.society.value is a Member of CrossRef

American Institute of Physics

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