A dielectric material, Zr0.10Ta0.90O2.45, with a noncentrosymmetric L-Ta2O5-related structure

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-04-15 DOI:10.1063/5.0259303

Takanori Mimura, Suzuka Udagawa, Yoshiyuki Inaguma

引用次数: 0

Abstract

A dielectric material with a noncentrosymmetric L-Ta2O5-related structure, Zr0.10Ta0.90O2.45, was synthesized through a solid-state reaction using Ta2O5 and ZrO2 powders, followed by a 1700 °C heat treatment. The structure was determined to have a C-centered orthorhombic symmetry [a = 6.3717(2) Å, b = 10.8003(4) Å, c = 3.87058(12) Å], and is denoted as L′-Ta2O5. The possible space groups are C222, Cmm2, C2mm, or Cm2m. The L′-Ta2O5-type Zr0.10Ta0.90O2.45 has a strong second-harmonic generation signal and higher dielectric constant of 55, compared to conventional L-Ta2O5-related structures. High-temperature x-ray diffraction shows the phase transition to the L″-Ta2O5 phase with a pseudo-hexagonal structure around 400 K. The temperature dependence of the dielectric constant reveals that the phase has a maximum value of 60, which is attributed to the phase transition. Zr0.10Ta0.90O2.45 is a potential candidate for application in complementary metal–oxide–semiconductor-compatible devices using noncentrosymmetric materials.

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具有非中心对称l - ta2o5相关结构的介电材料Zr0.10Ta0.90O2.45

以Ta2O5和ZrO2粉末为原料，经1700℃热处理，通过固相反应合成了具有非中心对称l -Ta2O5相关结构的介电材料Zr0.10Ta0.90O2.45。确定该结构为c中心正交对称结构[a = 6.3717(2) Å， b = 10.8003(4) Å， c = 3.87058（12） Å]，用L ' -Ta2O5表示。可能的空间组有：C222、Cmm2、C2mm、Cm2m。与传统的L- ta2o5相关结构相比，L ' - ta2o5型Zr0.10Ta0.90O2.45具有较强的二次谐波产生信号和较高的介电常数55。高温x射线衍射表明，在400 K左右相变为L″-Ta2O5相，具有准六方结构。介电常数的温度依赖性表明，相位的最大值为60，这归因于相变。Zr0.10Ta0.90O2.45是非中心对称材料的互补金属氧化物-半导体兼容器件的潜在候选材料。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

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