Aliovalent Al³⁺ substitution-induced enhancement of Mg²⁺ ionic conductivity in NASICON-type Mg0.5Ti2(PO4)3 solid electrolytes

IF 3 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Applied Physics A Pub Date : 2026-10-15 DOI:10.1007/s00339-026-10269-y

N. A. Wahab, M. H. Shehri, S. B. R. S. Adnan, S. Rudhziah, N. A. Dzulkurnain, N. A. Mustaffa

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Abstract

The Mg₀.₅₊₀.₅ₓAlₓTi₂₋ₓ(PO₄)₃ samples (x = 0.1, 0.3, 0.5, 0.7 and 0.9) were investigated to evaluate the effect of Al³⁺ substitution on the structural and ionic transport properties of Mg₀.₅Ti₂(PO₄)₃. XRD results confirmed that the samples predominantly exhibited a rhombohedral R-3c crystal structure similar to that of the parent compound. The Al³⁺ substitution for Ti⁴⁺ is proposed to promote charge compensation, which may facilitate the incorporation of additional Mg²⁺ ions and consequently enhance ionic transport. Among the investigated compositions, x = 0.5 (AL5) exhibited the highest ionic conductivity, reaching 2.61 × 10⁻⁸ S cm⁻¹ at room temperature and 5.41 × 10⁻⁶ S cm⁻¹ at 500 °C. The enhancement in conductivity is consistent with the proposed charge-compensation mechanism, although direct confirmation of interstitial Mg²⁺ occupancy requires further structural characterization. The frequency-dependent conductivity and temperature dependence of the frequency exponent further indicate thermally activated ionic transport in AL5. The Arrhenius analysis of total ionic conductivity yielded apparent activation energies of 0.04 eV and 0.62 eV for the low and high temperature regions, respectively. These findings demonstrate that Al substitution can effectively enhance the ionic transport properties of Mg₀.₅Ti₂(PO₄)₃ and provide useful insight into the development of NASICON-type magnesium-ion solid electrolytes.

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银价Al³+取代诱导Mg²+在nasicon型Mg0.5Ti2(PO4)3固体电解质中的离子电导率增强

Mg₀。₅₊₀。研究了₅ₓAlₓTi₂₄ₓ（PO₄）₃样品（x = 0.1、0.3、0.5、0.7和0.9），以评估Al³⁺取代对Mg₀.₅Ti₂（PO₄）₃结构和离子传输性能的影响。XRD结果证实，样品主要呈现与母体化合物相似的R-3c菱面体晶体结构。Al³⁺取代Ti⁴⁺是为了促进电荷补偿，这可能促进额外Mg²⁺离子的掺入，从而增强离子传输。在被研究的组合物中，x = 0.5 （AL5）表现出最高的离子电导率，在室温下达到2.61 × 10⁻⁸S cm⁻¹，在500℃时达到5.41 × 10⁻⁶S cm⁻¹。电导率的增强与提出的电荷补偿机制是一致的，尽管直接确认Mg 2 +占据间隙需要进一步的结构表征。频率指数的频率依赖电导率和温度依赖进一步表明AL5中的热激活离子传输。总离子电导率的Arrhenius分析表明，低温区和高温区离子电导率的表观活化能分别为0.04 eV和0.62 eV。这些结果表明，Al取代可以有效地提高Mg 0的离子输运性质。₅Ti₂（PO₄）₃并为nasicon型镁离子固体电解质的开发提供有用的见解。

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来源期刊

Applied Physics A 工程技术-材料科学：综合

CiteScore

4.80

自引率

7.40%

发文量

964

审稿时长

38 days

期刊介绍： Applied Physics A publishes experimental and theoretical investigations in applied physics as regular articles, rapid communications, and invited papers. The distinguished 30-member Board of Editors reflects the interdisciplinary approach of the journal and ensures the highest quality of peer review.