Abstract

A temperature-modulated pyroelectricity measurement system for a small single crystal is developed and applied to standard sample measurements performed on a thin single crystal of lithium niobate. The modulation measurement is based on the AC technique, in which the temperature of the sample is periodically oscillated, and the synchronized pyroelectric signal is extracted using a lock-in amplifier. Temperature modulation is applied by irradiating periodic light on the sample placed in the heat exchange gas. To apply this technique to the transparent reference sample, a commercially available black resin is coated on the sample’s surface to absorb the light energy and transmits it to the specimen. The experimental results are analyzed using a two-layer heat transfer model to verify the effect of the light-absorbing layer as well as the radiative temperature modulation system.

Highlights

  • Ferroelectrics and pyroelectrics are advanced materials with a variety of functional physical properties

  • A temperature-modulated measurement system was developed to measure the pyroelectricity of a small sample with high sensitivity

  • The temperature of the sample can be modulated by periodic light irradiation in the heat exchange gas

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Summary

Introduction

Ferroelectrics and pyroelectrics are advanced materials with a variety of functional physical properties. To understand the potential applications, the electrical polarization of these new ferroelectrics properties needs to be investigated. Most of these crystals, molecular crystals, are so small and fragile that they cannot be formed into a shape suitable for applying strong electric fields. A class of charge-transfer molecular complexes, which has recently attracted attention as a new type of ferroelectric, is highly conductive in nature; it cannot be loaded with sufficient fields for polarization conversions [4,8,9]

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