The Crystallization Behavior of a Na2O-GeO2-P2O5 Glass System: A (Micro)Structural, Electrical, and Dielectric Study

Znanstveni rad - Izvorni znanstveni rad

• Autor: Sara Marijan
• Autor: Marta Razum
• Autor: Kristina Sklepić Kerhač
• Autor: Petr Mošner
• Autor: Ladislav Koudelka
• Autor: Jana Pisk
• Autor: Andrea Moguš-Milanković
• Autor: Željko Skoko
• Autor: Luka Pavić
• Autorova ustanova: Sveučilište u Zagrebu; Prirodoslovno-matematički fakultet; (Fizički odsjek)
• Znanstveno / umjetničko područje, polje i grana: PRIRODNE ZNANOSTI; Fizika

Sažetak (engleski)

Sodium-phosphate-based glass-ceramics (GCs) are promising materials for a wide range of applications, including solid-state sodium-ion batteries, microelectronic packaging substrates, and humidity sensors. This study investigated the impact of 24 h heat-treatments (HT) at varying temperatures on Na-Ge-P glass, with a focus on (micro)structural, electrical, and dielectric properties of prepared GCs. Various techniques such as powder X-ray diffraction (PXRD), infrared spectroscopy-attenuated total reflection (IR-ATR), and scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) were employed. With the elevation of HT temperature, crystallinity progressively rose; at 450 °C, the microstructure retained amorphous traits featuring nanometric grains, whereas at 550 °C, HT resulted in fully crystallized structures characterized by square-shaped micron-scale grains of NaPO3. The insight into the evaluation of electrical and dielectric properties was provided by Solid-State Impedance Spectroscopy (SS-IS), revealing a strong correlation with the conditions of controlled crystallization and observed (micro)structure. Compared to the initial glass, which showed DC conductivity (σDC) on the order of magnitude 10−7 Ω−1 cm−1 at 393 K, the obtained GCs exhibited a lower σDC ranging from 10−8 to 10−10 Ω−1 cm−1. With the rise in HT temperature, σDC further decreased due to the crystallization of the NaPO3 phase, depleting the glass matrix of mobile Na+ ions. The prepared GCs showed improved dielectric parameters in comparison to the initial glass, with a noticeable increase in dielectric constant values (~20) followed by a decline in dielectric loss (~10−3) values as the HT temperatures rise. Particularly, the GC obtained at @450 stood out as the optimal sample, showcasing an elevated dielectric constant and low dielectric loss value, along with moderate ionic conductivity. This research uncovers the intricate relationship between heat-treatment conditions and material properties, emphasizing that controlled crystallization allows for precise modifications to microstructure and phase composition within the remaining glassy phase, ultimately facilitating the fine-tuning of material properties.

• Ključne riječi (engleski): phosphate glasses; phosphate glass-ceramics; controlled crystallization; (micro)structure-property relationship; IR-ATR; PXRD; SEM-EDS; Solid-State Impedance Spectroscopy (SS-IS)
• Jezik: engleski
• Vrsta publikacije: Znanstveni rad - Izvorni znanstveni rad
• Status objave: Objavljen
• Vrsta recenzije: Recenziran - međunarodna recenzija
• Verzija publikacije: Objavljena verzija rada (izdavačev PDF)
• Naslov časopisa: Materials
• Brojčani podaci: vol. 17, br. 2, 306
• e-ISSN: 1996-1944
• DOI: https://doi.org/10.3390/ma17020306
• URN:NBN: urn:nbn:hr:217:324021
• Datum objave publikacije: 2024-01-07
• Projekt: Šifra: IP-2014-09-5863; Naziv (hrvatski): Električni transport u staklima i staklo-keramici; Naziv (engleski): Electrical transport in glasses and glass-ceramics; Kratica: EL-Trass-Ceram; Voditelj: Andrea Moguš-Milanković; Pravna nadležnost: Hrvatska; Financijer: Hrvatska zaklada za znanost; Linija financiranja: Research Projects
• URL dokumenta: https://www.mdpi.com/1996-1944/17/2/306
• Vrsta resursa: Tekst
• Prava pristupa: Otvoreni pristup
• Javna napomena: © 2024 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Received: 7 December 2023. Revised: 2 January 2024. Accepted: 5 January 2024. Published: 7 January 2024.
• Datum i vrijeme pohrane: 2024-07-25 20:34:51