Ferroelectric films on metal substrates: The role of thermal expansion mismatch on dielectric, piezoelectric, and pyroelectric properties

Abstract

We present here a comprehensive analysis of the effect of thermal stresses on the functional properties of ferroelectric oxides on metal substrates. We use a Landau-Devonshire formalism to quantitatively assess the role of in-plane thermal strains that arise from the coefficient of thermal expansion (CTE) mismatch between lead zirconate titanate [PbZrxTi1–xO3, PZT x/(1 – x)] films and Al, Cu, Fe, Ni, and Ti-based substrates. Specifically, we compute Curie transition temperatures, spontaneous polarizations, dielectric permittivities, piezoelectric coefficients, and pyroelectric responses of tetragonal PZT compositions as a function of the growth/processing temperature. To provide a rapid evaluation, we also develop Ashby diagrams of property coefficients as a function of PZT composition, processing temperature, and CTE of the substrate. Our results show that thermal strains in PZT may significantly alter the ferroelectric transition temperature, dielectric, piezoelectric, and pyroelectric properties. For example, for PZT 50/50 films on Ni-based superalloys processed/annealed at 700 °C, we predict monodomain intrinsic dielectric, piezoelectric, and pyroelectric responses to be 234, 152 pC/N, and 0.021 μC cm−2 °C−1, respectively, compared to bulk PZT 50/50 values of 381, 326 pC/N, and 0.045 μC cm−2 °C−1. These are substantial variations which show that thermal strains must be considered in the design and development of built-in functionality obtained through ferroelectric films in structural, aerospace components.

Excellent ferroelectric and pyroelectric performance of rhombohedral Mn‐doped PIMNT thin films with (111) orientation

“…[7][8][9][10][11][12] In the development of micro/nano-electromechanical systems, to broaden the temperature range of the device, a ternary relaxor ferroelectric thin film with a high Curie point was proposed. [6][7][8] A high Curie temperature (T C ) of 215℃ together with remnant polarization P r of 5.5 µC cm −2 and coercive field E C of 1.35 kV mm −1 of PIMNT(30/38/32) ternary thin films deposited on (110)-oriented MgO substrates were obtained by a sputter deposition method. 13 Although Kang et al fabricated a PIMNT (24/43/33) film which exhibited a high curie temperature (T C ) of 255℃ by using aerosol deposition (AD) and annealing processes, the films resulted in poor deposition uniformity and large leakage current.…”

“…6 Although a remnant polarization P r of 17 μC cm −2 , coercive field E C of 6.35 kV mm −1 , and pyroelectric coefficient p of 9.4 × 10 −4 C m −2 K −1 of PMNT binary thin films has been reported recently, the relatively low Curie temperature of PMNT films limited their usage temperature range for device applications. [7][8][9][10][11][12] In the development of micro/nano-electromechanical systems, to broaden the temperature range of the device, a ternary relaxor ferroelectric thin film with a high Curie point was proposed. [6][7][8] A high Curie temperature (T C ) of 215℃ together with remnant polarization P r of 5.5 µC cm −2 and coercive field E C of 1.35 kV mm −1 of PIMNT(30/38/32) ternary thin films deposited on (110)-oriented MgO substrates were obtained by a sputter deposition method.…”

“…23,[31][32][33][34][35][36][37][38] T in these cases to determine the resin flow ing times corresponding to different infilt Preceramic polycarbosilane polymers as precursors to make ceramic fibers 10,3 trix. [7][8][9]40,41 The chemical and volume ch pany ceramization of the polymer during documented in several studies. behavior, this behavior was attributed to polydomain structure, higher preferred orientation, grain size, and mechanical stress from substrate clamping.…”

“…Preceramic polycarbosilane polymers are commonly used as precursors to make ceramic fibers 10,39 and ceramic matrix. [7][8][9]40,41 The chemical and volume changes that accompany ceramization of the polymer during pyrolysis have been documented in several studies. For example, see Refs [39][40][41][42].…”

Study of the Layer-Type BST Thin Film with X-ray Diffraction and X-ray Photoelectron Spectroscopy

“…Therefore, the possibility of integrating (or built-in) a functionality into structural materials, which are primarily metals and their alloys, will create the possibility of real-time health monitoring of the structural components (of constructions and devices) and extend the maintenance cycle of components. Moreover, it will create the possibility of developing new structural functional systems [22].…”