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首页> 外文学位 >Initial development of a pyroelectric microcalorimeter for applications in x-ray spectroscopy with the quantum ferroelectric potassium tantalum(1-x) niobium(x) oxygen(3).
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Initial development of a pyroelectric microcalorimeter for applications in x-ray spectroscopy with the quantum ferroelectric potassium tantalum(1-x) niobium(x) oxygen(3).

机译：热释电量热仪的初步开发，用于量子铁电钽钽（1-x）铌（x）氧（3）的x射线光谱分析。

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摘要

We are investigating the use of a cryogenic pyroelectric microcalorimeter for X-ray spectroscopy. This type of detector takes advantage of the temperature dependence of the surface charge in ferroelectric and pyroelectric materials to detect the energy of a single absorbed photon or particle. This type of sensor should have advantages over traditional resistive microcalorimeters by having minimal self heating and a reduction of Johnson noise. Several properties of candidate materials are important to its operation as a microcalorimeter. We have measured the dielectric permittivity and parallel resistance of a number of candidate materials as functions of static electric field, temperature and frequency. From these measurements we then picked one of the materials the mixed-crystal quantum ferroelectric KTa{dollar}sb{lcub}rm 1-x{rcub}{dollar}Nb{dollar}sb{lcub}rm x{rcub}{dollar}O{dollar}sb3{dollar} (KTN) for more extensive studies. These included measuring the response of the surface charge to infrared light, alpha particles and changes in temperature. These measurements show the complex nature of KTN with a nonlinear dependence on a static electric field across the device. From these measurements we were able to obtain the pyroelectric response and pyroelectric coefficient as well as the heat capacity of this material. We have shown that the signal response is a function of the sample thickness in KTN and that the surface layers responsible for the geometry dependence reduce the signal from that expected from measured bulk properties. If these surface layers are reduced, then a microcalorimeter comparable to that made with resistive sensors is possible in a thin device.
机译：我们正在研究用于X射线光谱学的低温热电微热量计的使用。这种类型的检测器利用铁电和热电材料中表面电荷的温度依赖性来检测单个吸收的光子或粒子的能量。这种类型的传感器应该具有比传统的电阻式微热量计更高的优势，因为它具有最小的自发热和约翰逊噪声的减少。候选材料的几种特性对其作为微量量热仪的操作很重要。我们已经测量了许多候选材料的介电常数和并联电阻，它们是静电场，温度和频率的函数。从这些测量中，我们然后选择了一种材料，即混合晶体量子铁电体KTa {dollar} sb {lcub} rm 1-x {rcub} {dollar} Nb {dollar} sb {lcub} rm x {rcub} {dollar} O {dollar} sb3 {dollar}（KTN）进行更广泛的研究。这些措施包括测量表面电荷对红外光，α粒子和温度变化的响应。这些测量结果显示出KTN的复杂特性，它对整个器件上的静电场具有非线性依赖性。从这些测量中，我们能够获得热电响应和热电系数以及该材料的热容量。我们已经表明，信号响应是KTN中样品厚度的函数，并且负责几何形状依赖性的表面层使信号与实测体积性质所期望的信号降低。如果减少了这些表面层，则可以在薄型设备中实现与电阻传感器相比的微热量计。

著录项

  • 作者

    Pfafman, Timothy Edward.;

  • 作者单位

    University of California, Berkeley.;

  • 授予单位 University of California, Berkeley.;
  • 学科 Physics Astronomy and Astrophysics.; Physics Electricity and Magnetism.; Physics Condensed Matter.
  • 学位 Ph.D.
  • 年度 1993
  • 页码 122 p.
  • 总页数 122
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 天文学;电磁学、电动力学;
  • 关键词

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