Thermal expansion of the new perovskite substrates DyScO<sub>3</sub> and GdScO<sub>3</sub>

Biegalski, Michael D.; Haeni, J. H.; Trolier-McKinstry, Susan; Schlom, Darrell G.; Brandle, C. D.; Graitis, A. J. Ven

doi:10.1557/jmr.2005.0126

Cited by 89 publications

(88 citation statements)

References 28 publications

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“…Among the standard single crystal oxide substrates that are used to for epitaxial growth of PZT thin films across the strain regime we have investigated herein (-0.02 ≤ S m ≤ 0.02), the thermal expansion coefficients and elastic constants are available only for two: SrTiO 3 (STO) 36,37,38 and GdScO 3 (GSO). 39,40 We focus here on the analysis of films grown on these two substrates to estimate the secondary pyroelectric coefficient for PZT thin films as a function of composition. The thermal expansion coefficient, elastic constants, and piezoelectric coefficients for PZT were obtained from Refs.…”

Section: Pyroelectric Properties Of Epitaxial Pzt Thin Filmsmentioning

confidence: 99%

Pyroelectric properties of polydomain epitaxial Pb(Zr1−x,Tix)
Karthik
¹
,
Martin
²

2011
Phys. Rev. B

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The pyroelectric properties of polydomain epitaxial Pb(Zr 1-x ,Ti x )O 3 thin films are investigated using a Ginzburg-Landau-Devonshire thermodynamic model. We explore the three major contributions to pyroelectric response in thin films including intrinsic effects and previously neglected contributions such as extrinsic and secondary effects, to provide a complete picture of pyroelectric property development. The pyroelectric coefficient for epitaxial thin films is calculated as a function of strain, temperature, and composition for 0.5 ≤ x ≤ 1.0. We find that structural transitions driven by epitaxial strain can greatly enhance the pyroelectric coefficient and that extrinsic contributions due to temperature driven domain wall motion can significantly alter the intrinsic pyroelectric properties. Furthermore, we show that the pyroelectric coefficient at room temperature is maximized at the multicritical point between various polydomain phases and is also consistently high along the boundary between the c/ a/ c/ a and a 1 / a 2 / a 1 / a 2 polydomain phases. Additionally, we have investigated the impact of epitaxial strain on pyroelectric response in polydomain states and found that the extrinsic contribution from domain walls to the pyroelectric coefficient varies depending on the sign of the strain. Finally we examine the addition of secondary contributions to pyroelectricity that arise from thermal expansion in materials and provide insight into the effect of this contribution on the overall magnitude of response.2

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Section: Pyroelectric Properties Of Epitaxial Pzt Thin Filmsmentioning

confidence: 99%

Pyroelectric properties of polydomain epitaxial Pb(Zr1−x,Tix)
Karthik
¹
,
Martin
²

2011
Phys. Rev. B

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“…The thin films are grown on (110)-oriented DyScO 3 substrates 17 by Pulsed Laser Deposition (PLD) from PbTiO 3 targets with 4 at. % excess lead.…”

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confidence: 99%

Thickness scaling of ferroelastic domains in PbTiO3 films on DyScO3

Nesterov

Matzen

Magén

et al. 2013

Applied Physics Letters

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We report on the thickness dependence of the ferroelastic domains of PbTiO 3 films grown on (110)-DyScO 3 with low thicknesses (up to 240 nm), which fall outside the validity range of the square root law proposed by Roytburd. For slow-grown films, the data reveal the linear thickness dependence predicted by Pertsev and Zembilgotov, using a complete elastic description, while a 2/3 scaling exponent is found for fast-grown films. Extremely long domains running all through the samples have been observed in the latter case, compared to the short domains observed in slow-grown films. These differences are ascribed to the in-plane anisotropy for domain wall nucleation, which is likely caused by the anisotropic elastic modulus of the substrate. V C 2013 AIP Publishing LLC.[http://dx.doi.org/10.1063/1.4823536]The response of domains and domain walls crucially affects (and often determines) the dielectric properties and switching behavior of ferroelectrics. This is particularly important in thin films where the ferroelectric (180 ) and ferroelastic (non-180 ) domain walls are formed in order to comply with the stringent electrical (large depolarizing field) and mechanical (substrate mismatch strain and clamping) boundary conditions.The size of the domains increases with increasing film thickness as a result of the balance between the depolarizing field energy (for 180 domains) 1 or elastic strain energy (for non-180 domains) 2 and the domain wall formation energy. Thus, the thinner the films, the larger the domain wall density and the greater the influence of the walls on the ferroelectric properties. Moreover, domain walls break spatial symmetry and could add functionalities to the films when present in large amounts. 3 It is therefore most relevant to have good control of the domain formation and the density of domain walls. 4 Domain formation in ferroelectrics has been largely studied. 2,3,[5][6][7][8][9][10][11][12][13][14][15] In order to adapt to the substrate and to locally minimize the mismatch strain or the depolarizing field, the domains form in a periodic manner. 6,7 It is known that there is a quadratic dependence, W / d 1=2 , of the domain width (W) with the crystal thickness (b). In ferroelastic domains (typically 90 domains), this b 1=2 dependence is an approximation in the regime of d ) W. 2 For smaller thicknesses, a linear dependence has been predicted by Pertsev and Zembilgotov (P&Z), 8 but it has not been experimentally confirmed yet.In this paper we investigate the thickness dependence of the periodicity of ferroelastic 90 domains (a/c twins) in the lower thickness regime using PbTiO 3 films grown on DyScO 3 substrates. This combination is chosen because there is a very small lattice mismatch between film and substrate at the growth temperature. This minimizes the formation of defects during growth. As the films are cooled down strain develops and can be relaxed by forming a/c domains. The absence of defects allows these domains to form in a very periodic fashion. 13,16 Interestingly, when the films...

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“…Finding a right choice of film and substrate, which imposes enough strain without causing misfit dislocations is quite important but it was, until recently, difficult. Here we show that this is now possible by combining ferroelectric PbTiO 3 (PTO) with the recently introduced DyScO 3 (DSO), as a substrate [7,9,22].…”

Section: Introductionmentioning

confidence: 99%

“…DyScO 3 (DSO) is an orthorhombic perovskite with a pseudocubic lattice parameter of a s b s = 3.95Å [22]. There is, however, a near perfect lattice match of the two at the growth temperature, where PTO is in its cubic phase.…”

Section: Introductionmentioning

confidence: 99%

Periodic nanodomains in PbTiO3 films under tensile strain

Noheda

Vlooswijk

Janssens

et al. 2008

2008 17th IEEE International Symposium on the Applications of Ferroelectrics

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-In epitaxial ferroelectric thin films under tensile strain, a transition from 180 o domains to 90 o domains can be achieved by increasing the film thickness. In many cases, the 90 o a/c domains appear in the form of wide c-domains separated by narrow astripes. We have deposited thin films of PbTiO 3 on DyScO 3 substrates and show that the condition of horizontal coherence forces the a-domains to adopt discrete sizes, the smallest of which is substrateindependent and depends only on the tetragonality of the ferroelectric film. Growing PbTiO 3 on DyScO 3 , we have achieved the narrowest (6 nm) possible a-domains, as well as the shortest periodicity that allows to maintain the lateral coherence in the film.

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Thermal expansion of the new perovskite substrates DyScO₃ and GdScO₃

Cited by 89 publications

References 28 publications

Pyroelectric properties of polydomain epitaxial Pb(Zr1−x,Tix)
Karthik
¹
,
Martin
²

2011
Phys. Rev. B

Pyroelectric properties of polydomain epitaxial Pb(Zr1−x,Tix)
Karthik
¹
,
Martin
²

2011
Phys. Rev. B

Thickness scaling of ferroelastic domains in PbTiO3 films on DyScO3

Periodic nanodomains in PbTiO3 films under tensile strain

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Thermal expansion of the new perovskite substrates DyScO3 and GdScO3

Cited by 89 publications

References 28 publications

Pyroelectric properties of polydomain epitaxial Pb(Zr1−x,Tix)Karthik1, Martin2 2011Phys. Rev. B

Pyroelectric properties of polydomain epitaxial Pb(Zr1−x,Tix)Karthik1, Martin2 2011Phys. Rev. B

Thickness scaling of ferroelastic domains in PbTiO3 films on DyScO3

Periodic nanodomains in PbTiO3 films under tensile strain

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Product

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Thermal expansion of the new perovskite substrates DyScO₃ and GdScO₃

Pyroelectric properties of polydomain epitaxial Pb(Zr1−x,Tix)
Karthik
¹
,
Martin
²

2011
Phys. Rev. B

Pyroelectric properties of polydomain epitaxial Pb(Zr1−x,Tix)
Karthik
¹
,
Martin
²

2011
Phys. Rev. B