Синтез, структура та властивості твердих розчинів Ва1–xSn1+xF4 і (KyВа1–y)(1–x)Sn1+xF4–y(1–x)
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2021
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Український державний хіміко-технологічний університет
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Abstract
Досліджена структура та електропровідні властивості твердих розчинів гомовалентного Ва1–xSn1+xF4 (x=0.03, 0.05, 0.07, 0.10, 0.15,0.23) та гетеровалентного заміщення (KyВа1–y)(1–x)Sn1+xF4–y(1–x) (x=0.03, 0.05, 0.10 and x=0.03, 0.05, 0.10) зі структурою BaSnF4. Встановлено, що заміщення 7 мол.% Катіонів Ba2 + на Sn2 + катіони сприяли збільшенню електропровідності.
We investigated the structure and electric conductivity of solid solutions of homovalent substitution Ва1–xSn1+xF4 (where x=0.03, 0.05, 0.07, 0.10, 0.15 and 0.23) and heterovalent substitution (KyВа1–y)(1–x)Sn1+xF4–y(1–x) (where x=0.03, 0.05, 0.10 and ó=0.03, 0.05, 0.10) with the structure of BaSnF4. It was been found that the substitution of 7 mol.% of Ba2+ cations by Sn2+ cations contributed to an increases in electrical conductivity. The solid solution Ba0.77Sn1.23F4 had the highest electrical conductivity (573=6.8010–3 S cm–1). The substitution of barium ions by potassium ions in the BaSnF4 crystal lattice allowed reducing the conductivity of solid solutions regardless of the substituent content. Only the phases containing more than 3 mol.% of K+ ions exhibited the conductivity which exceeded the value of the initial phase at the temperatures above 385 K. In fluoride-conducting phases (KyBa1–y)(1–x)Sn1+xF4–y(1–õ), the following solid solutions showed the highest electrical conductivity: (K0.05Ba0.95)0.97Sn1.03F3.95 (573=6.7810–4 S ñm–1), (K0.03Ba0.97)0.95Sn1.05F3.97 (573=1.0010–3 S ñm–1) and (K0.10Ba0.90)0.90Sn1.10F3.91 (573=8.7010–3 S ñm–1).
We investigated the structure and electric conductivity of solid solutions of homovalent substitution Ва1–xSn1+xF4 (where x=0.03, 0.05, 0.07, 0.10, 0.15 and 0.23) and heterovalent substitution (KyВа1–y)(1–x)Sn1+xF4–y(1–x) (where x=0.03, 0.05, 0.10 and ó=0.03, 0.05, 0.10) with the structure of BaSnF4. It was been found that the substitution of 7 mol.% of Ba2+ cations by Sn2+ cations contributed to an increases in electrical conductivity. The solid solution Ba0.77Sn1.23F4 had the highest electrical conductivity (573=6.8010–3 S cm–1). The substitution of barium ions by potassium ions in the BaSnF4 crystal lattice allowed reducing the conductivity of solid solutions regardless of the substituent content. Only the phases containing more than 3 mol.% of K+ ions exhibited the conductivity which exceeded the value of the initial phase at the temperatures above 385 K. In fluoride-conducting phases (KyBa1–y)(1–x)Sn1+xF4–y(1–õ), the following solid solutions showed the highest electrical conductivity: (K0.05Ba0.95)0.97Sn1.03F3.95 (573=6.7810–4 S ñm–1), (K0.03Ba0.97)0.95Sn1.05F3.97 (573=1.0010–3 S ñm–1) and (K0.10Ba0.90)0.90Sn1.10F3.91 (573=8.7010–3 S ñm–1).
Keywords
фторидпровідні фази, тверді розчини заміщення, фториди барію, станум, калій, йонна провідність, імпедансна спектроскопія, fluoride-conducting phase, substitutional solid solution, barium, tin and potassium fluorides, ionic conduction, electrochemical impedance spectroscopy
Citation
Синтез, структура та властивості твердих розчинів Ва1–xSn1+xF4 і (KyВа1–y)(1–x)Sn1+xF4–y(1–x) / Р.М. Пшеничний, Т.В. Павленко, Ю.В. Погоренко, А.О. Омельчук // Voprosy Khimii i Khimicheskoi Tekhnologii. – 2021. – № 1. – C. 62-70. – http://dx.doi.org/10.32434/0321-4095-2021-134-1-62-70