Role of Oxygen Vacancy Migration in Pyroelectric Currents of Nd2Ti2O7 Ceramics as High Temperature Sensors

热电性 材料科学 陶瓷 空位缺陷 温度测量 氧气 凝聚态物理 光电子学 热力学 物理 冶金 铁电性 电介质 量子力学
作者
Manish Chandra Joshi,Sireesha Lavadiya,Sai Santosh Kumar Raavi,Ranjith Ramadurai
出处
期刊:IEEE Sensors Journal [IEEE Sensors Council]
卷期号:24 (7): 9472-9479
标识
DOI:10.1109/jsen.2024.3369327
摘要

A high ${T}_{C}$ ferroelectric material ${\text {Nd}}_{{2}}{\text {Ti}}_{{2}}\text {O}_{{7}}$ (neodymium titanate) was studied using photocurrent measurement and impedance spectroscopy (IS) to investigate the intrinsic and extrinsic factors in the pyrocurrent generation. The alteration in the pyroelectric coefficient was observed while varying the heating and cooling rates, spanning from 5 °C/min to 30 °C/min, corresponding to values of 88– $90~\mu \text{C} / \text{m}^{{2}}\text{K}$ and 28– $30~\mu \text{C} / \text{m}^{{2}}\text{K}$ , respectively. At higher heating and cooling rates (from 30 °C/min to 80 °C/min), the pyroelectric coefficients remained relatively constant (21.8 $\pm ~4.0~\mu \text{C} / \text{m}^{{2}}\text{K}$ ). The dispersive nature of the pyrocurrent was verified through photocurrent studies followed by the IS analysis. The measurement outcomes reveal the presence of oxygen vacancies that dominate between 300 °C and 500 °C. Below 300 °C, extrinsic factors, such as shallow traps, consisting of space charge near electrode–material interface, could have a greater impact on the pyrocurrent at zero electric field. When an electric field is applied above 300 °C, oxygen vacancies migration can become the dominant conduction mechanism due to the collective effect of electric field and temperature. The estimated relaxation time ( $\tau _{M^{\,\prime \prime }}{)}$ exhibits the Arrhenius behavior, with an activation energy of ~0.92 eV, which implies oxygen vacancy migration with the assistance of external electric field. However, the thermal cycling of samples provided a true estimate of intrinsic pyroelectric currents in NTO ceramics without the influence of the thermal migration of oxygen vacancies resulting into a temperature-independent pyroelectric coefficient of about 15 $\pm ~0.5~\mu \text{C} / \text{m}^{{2}}\text{K}$ in the temperature range from 300 °C to 500 °C. Thus, NTO ceramic can operate as a temperature sensor without influence of extrinsic factors for the temperature range from 300 °C to 500 °C.
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