Epitaxial thin film heterostructures of relaxor ferroelectric Pb(Mg1/3Nb2/3)O3-PbTiO3

Lavric, D.; Rao, R. A.; Gan, Q.; Krajewski, J. J.; Eom, Chang‐Beom

doi:10.1080/10584589808202090

Cited by 18 publications

(11 citation statements)

References 15 publications

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“…Uniform ablation of the PMN-PT target (no droplet formation) was found in the range 1.5 -2.5 J/cm 2 , consistent with frequently employed laser energy density values found in literature. 8,11,18 Figure 1 , which is caused by lead deficiency in the film. For the high fluence case this was ascribed to re-evaporation of PbO from the substrate, due to the energetic bombardment by atoms and ions from the plasma.…”

Section: A Phase Optimization and Structural Propertiesmentioning

confidence: 99%

“…Besides lead stoichiometry, the Mg/Nb ratio is also found essential to fabricate perovskite phase pure PMN-PT films. 8 It is noticed that PMN-PT is commonly preferred over PZN-PT, since the later contains two volatile elements (Zn and Pb) although both exhibit superior properties compared to the presently widely used (PZT) ferroelectric material.…”

Section: Introductionmentioning

confidence: 99%

“…These non-piezoelectric phases cause degradation of the functional properties of the deposited films. [8][9][10] Further the properties of PMN-PT films are sensitive to exact the stoichiometry of all five elements. Off-stoichiometry not only degrades the film properties but also causes the formation of impurity phases (pyrochlore phases).…”

Section: Introductionmentioning

confidence: 99%

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Effect of fabrication conditions on phase formation and properties of epitaxial (PbMg1/3Nb2/3O3)0.67-(PbTiO3)0.33 thin films on (001) SrTiO3

et al. 2016

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The pulsed laser deposition process of 300nm thick films of Pb(Mg1/3Nb2/3)O3)0.67-(PbTiO3)0.33 on (001)-oriented SrTiO3 was studied by varying deposition pressure, substrate deposition temperature, laser fluence on the target and target-substrate distance. Perovskite phase pure, (001)-oriented, epitaxial smooth films were obtained in a narrow range of deposition parameters. The ferroelectric and dielectric properties of films fabricated within this parameter range still vary significantly. This shows the sensitivity of the system for growth conditions. The best film has a polarization value close to that expected for a (001) poled, stress free single crystal film. All films show deposition conditions dependent variations in the self-bias field. The self-bias is very stable during long cycling for films made at optimum deposition conditions. The piezoelectric coefficients of the films are strongly reduced with respect to bulk single crystal values due to the film clamping. The properties variations are ascribed to changes in the grain boundary properties in which film defects are expected to accumulate. Notably slight off-stoichiometry may cause localized screening charges, affecting specifically the polarization and dielectric constant.

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Section: A Phase Optimization and Structural Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of fabrication conditions on phase formation and properties of epitaxial (PbMg1/3Nb2/3O3)0.67-(PbTiO3)0.33 thin films on (001) SrTiO3

et al. 2016

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“…The second phase peaks in x-ray diffraction are identified as the ͑222͒ reflection of rhombohedral pyrochlore Pb 2 Nb 2 O 7 and the ͑400͒ reflection of cubic pyrochlore Pb 3 Nb 4 O 13 , respectively. 2,14 In contrast, 5200 Å thick films deposited on 8°miscut substrates display strong perovskite PMN-PT peaks, as shown in Fig. 1͑b͒.…”

mentioning

confidence: 99%

“…[2][3][4] It is also known that it is difficult to control the stoichiometry in this system due to Pb loss during film growth. Nonetheless, high quality epitaxial PMN-PT thin films have been grown by pulsed laser deposition 2,3 and metalorganic chemical vapor deposition, 4 among other methods. 4 Typically, piezoelectric coefficients from 50 to 350 pC/N and relative dielectric constants between 300 and 2000 have been reported at room temperature.…”

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confidence: 99%

Perovskite phase stabilization in epitaxial Pb(Mg1/3Nb2/3)O3–PbTiO3 films by deposition onto vicinal (001) SrTiO3 substrates

Lee

Eom

et al. 2001

Applied Physics Letters

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We report the perovskite phase stabilization of 0.67Pb͑Mg 1/3 Nb 2/3 ͒O 3 -0.33PbTiO 3 ͑PMN-PT͒ epitaxial thin films by deposition onto miscut substrates. Films were grown on ͑001͒ SrTiO 3 substrates with miscut angles from 0 to 8 degrees toward the ͓100͔ direction using 90°off-axis magnetron sputtering. Films on high miscut substrates ͑Ͼ4°͒ showed almost the pure perovskite phase in both x-ray diffraction and transmission electron microscopy image, and were nearly stoichiometric. In contrast, films on exact ͑001͒ SrTiO 3 contained a high volume fraction of pyrochlore phases with Pb deficiency. Atomic force microscopy reveals that films on 8°miscut substrates have a much smoother surface morphology than those on exact ͑001͒ SrTiO 3 . Cross-sectional transmission electron microscopy images reveal that the pyrochlore phases nucleate on top of the perovskite phase, and that the amount of the pyrochlore phases increase with film thickness. A film on an 8°miscut substrate exhibits a polarization hysteresis loop with a remnent polarization of 20 C/cm 2 at room temperature.

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Thin‐Film Ferroelectrics

et al. 2022

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non-centrosymmetric structures which can possess a spontaneous electric polarization which can be controlled using applied electric fields (Figure 1). Ferroelectrics themselves are inherently hierarchical materials-wherein picometer ionic displacements give rise to polarization which can collectively extend over millimeters or self-organize into complex mesoscopic structures or collectively reorient under applied stimuli (e.g., electric fields, temperature, or stress). Understanding these complex behaviors necessitates a multilevel approach, wherein atomistic, microscopic, mesoscopic, and macroscopic properties are studied in concert. Parallel advances in synthesis, characterization, and simulation have enabled such multimodal studies and provided a methodology through which a multitude of ferroelectric functionalities can now be achieved and studied.The promise of utilizing these functionalities in a number of applications kick-started the modern era of ferroelectric research in the mid-20th century. [1] Looking further back, in the 1920s, the ability to switch the polarization of sodium potassium tartrate tetrahydrate (commonly known as Rochelle salt) was first observed, along with dielectric and piezoelectric anomalies near the ferroelectric transition-now called the Curie point. In the 1940s, as part of the accelerated research push associated with World War II, ferroelectric BaTiO 3 was discovered by accident. When modifying TiO 2 with BaO to enhance its dielectric properties, a record-high dielectric permittivity was discovered and subsequent studies demonstrated a hysteretic switchable polarization. This discovery ushered in a new understanding of ferroelectricity as more than a rare phenomenon associated with salts that contained hydrogen bonding, but rather as a phenomenon that could exist in simple oxides like perovskites. Over the subsequent decades, the number of ferroelectric compositions exploded, particularly within the perovskite oxides, introducing new chemistries including LiNbO 3 and the PbZr x Ti 1−x O 3 system. Meanwhile, theoretical descriptions of ferroelectricity were advanced through lattice-dynamical models invoking a soft-mode optical phonon. Studies of the piezoelectric, thermodynamic, and optical properties in ferroelectric ceramics allowed for their deployment in a number of applications including piezoelectric sensors and pyroelectric infrared detectors. By the 1960s, increased interest in using ferroelectric polarization for nonvolatile memory was driving research into Over the last 30 years, the study of ferroelectric oxides has been revolutionized by the implementation of epitaxial-thin-film-based studies, which have driven many advances in the understanding of ferroelectric physics and the realization of novel polar structures and functionalities. New questions have motivated the development of advanced synthesis, characterization, and simulations of epitaxial thin films and, in turn, have provided new insights and applications across the micro-, meso-, and macroscopic length sc...

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Epitaxial thin film heterostructures of relaxor ferroelectric Pb(Mg_1/3Nb_2/3)O₃-PbTiO₃

Cited by 18 publications

References 15 publications

Effect of fabrication conditions on phase formation and properties of epitaxial (PbMg1/3Nb2/3O3)0.67-(PbTiO3)0.33 thin films on (001) SrTiO3

Effect of fabrication conditions on phase formation and properties of epitaxial (PbMg1/3Nb2/3O3)0.67-(PbTiO3)0.33 thin films on (001) SrTiO3

Perovskite phase stabilization in epitaxial Pb(Mg1/3Nb2/3)O3–PbTiO3 films by deposition onto vicinal (001) SrTiO3 substrates

Thin‐Film Ferroelectrics

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