Surface Pyroelectricity and Piezoelectricity of Centrosymmetric Crystals

Elena Meirzadeh, Shiri Dishon, Igor Lubomirsky, David Ehre

פרסום מחקרי: פרסום בכתב עתסקירהביקורת עמיתים

תקציר

Properties of surfaces often define functionalities and applications of a large variety of materials, e. g., epitaxial growth of thin films, catalytic and optical properties. For this reason, advances in techniques for surface characterization are of great importance. Here we present an overview of the work conducted together with Prof. Meir Lahav over the last decade to detect and quantify near surface polar layers (NSPL). Though thin, these layers may accumulate considerable polarization and, thereby, affect surface properties. We demonstrated that pyroelectric measurement carried out with periodic temperature change protocol (modified Chynoweth) might be a primary tool to study NSPL. Two fundamentally different examples are considered. (i) NSPL in α-glycine crystals develops as a result of solvent incorporation, e. g., water. This layer is maybe tens or even hundreds of micrometers thick, sometimes, thick enough to allow piezoelectric measurements. (ii) NSPL in SrTiO3 results from surface relaxation and it is only a few Angstroms thick. Nevertheless, NSPL in SrTiO3 has a polarization comparable with strongly ferroelectric materials, tens of μC/cm2.
שפה מקוריתאנגלית
עמודים (מ-עד)750-757
מספר עמודים8
כתב עתIsrael Journal of Chemistry
כרך61
מספר גיליון11-12
תאריך מקוון מוקדם18 אוק׳ 2021
מזהי עצם דיגיטלי (DOIs)
סטטוס פרסוםפורסם - דצמ׳ 2021

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