Ag0.98Li0.02NbO3陶瓷的宽带和红外光谱

IF 0.3 4区物理与天体物理 Q4 PHYSICS, MULTIDISCIPLINARY

Lithuanian Journal of Physics Pub Date : 2020-12-13 DOI:10.3952/physics.v60i4.4360

E. Palaimiene, J. Macutkevič, J. Banys, I. Gruszka, A. Kania

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引用次数: 2

摘要

研究了Ag0.98Li0.02NbO3 (ALN2)陶瓷在20hz ~ 60thz宽频率范围内的介电性能。ALN2陶瓷的介电谱主要受高温(400k以上)和低频(100hz以下)的电导率、铁电相变温度Tc = 330 K以下和低频(1mhz以下)的铁电畴以及频率低于50 cm-1的软铁电模式的影响。所有声子模式都有轻微的温度依赖性，从而证实了Ag、O和Li离子动力学对相变的影响。然而，对相变动力学最重要的贡献是Nb离子。在微波频率范围内(在10ghz和室温下ε΄≈250和ε′≈20)，陶瓷具有较大的介电常数和较低的损耗，适用于各种微波介质应用。

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Broadband and infrared spectroscopy of Ag0.98Li0.02NbO3 ceramics

The dielectric properties of Ag0.98Li0.02NbO3 (ALN2) ceramics were investigated in a broad frequency range (20 Hz – 60 THz). The dielectric spectra of ALN2 ceramics are mainly impacted by electrical conductivity at higher temperatures (above 400 K) and low frequencies (below 100 Hz), ferroelectric domains below ferroelectric phase transition temperature Tc = 330 K and at low frequencies (below 1 MHz), and contribution of the soft ferroelectric mode, the frequency of which is below 50 cm–1. All phononic modes are slightly temperature dependent, thus confirming the influence of Ag, O and Li ions dynamics on the phase transitions. However, the most important contribution to the dynamics of phase transition is made by Nb ions. Ceramics exhibits a huge value of dielectric permittivity and relatively low losses in a microwave frequency range (ε΄ ≈ 250 and ε˝ ≈ 20 at 10 GHz and room temperature), indicating that it is suitable for various microwave dielectric applications.

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来源期刊

Lithuanian Journal of Physics 物理-物理：综合

CiteScore

0.90

自引率

16.70%

发文量

审稿时长

>12 weeks

期刊介绍： The main aim of the Lithuanian Journal of Physics is to reflect the most recent advances in various fields of theoretical, experimental, and applied physics, including: mathematical and computational physics; subatomic physics; atoms and molecules; chemical physics; electrodynamics and wave processes; nonlinear and coherent optics; spectroscopy.