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词汇 Bismuth trioxide
分类 英语词汇 英语翻译词典
释义

Bismuth trioxide

中文百科

三氧化二铋 Bismuth(III) oxide

（重定向自Bismuth trioxide）
Existence domains of the four polymorphs of Bi2O3 as a function of temperature. (a) The α-phase transforms to the δ-phase when heated above 727 °C, which remains the structure until the melting point, 824 °C, is reached. When cooled, the δ-phase transforms into either the β-phase at 650 °C, shown in (b), or the γ-phase at 639 °C, shown in (c). The β-phase transforms to the α-phase at 303 °C. The γ-phase may persist to room temperature when the cooling rate is very slow, otherwise it transforms to the α-phase at 500 °C.[2]
(a) Sillén model; vacancies ordered along<111>,[6] (b) Gattow model; vacancies completely disordered in oxygen sub-lattice, with each oxygen site having 75% occupancy,[7] (c) Willis model; oxygen atoms displaced from regular 8c sites (for example, the atom marked A in (b)) along<111> to 32f sites. The Bi3+ ions labelled 1–4 in (c) correspond to those labelled 1–4 in (b).[8]

三氧化二铋是一种无机化合物，化学式为Bi2O3，是铋最重要的化合物之一，虽然三氧化二铋可以从天然的铋华（一种矿物）取得，但是它主要的来源通常是炼铜或铅时的副产物，或直接燃烧铋（蓝色火焰）得到。

英语百科

Bismuth(III) oxide 三氧化二铋

（重定向自Bismuth trioxide）
Existence domains of the four polymorphs of Bi2O3 as a function of temperature. (a) The α-phase transforms to the δ-phase when heated above 727 °C, which remains the structure until the melting point, 824 °C, is reached. When cooled, the δ-phase transforms into either the β-phase at 650 °C, shown in (b), or the γ-phase at 639 °C, shown in (c). The β-phase transforms to the α-phase at 303 °C. The γ-phase may persist to room temperature when the cooling rate is very slow, otherwise it transforms to the α-phase at 500 °C.[2]
(a) Sillén model; vacancies ordered along<111>,[6] (b) Gattow model; vacancies completely disordered in oxygen sub-lattice, with each oxygen site having 75% occupancy,[7] (c) Willis model; oxygen atoms displaced from regular 8c sites (for example, the atom marked A in (b)) along<111> to 32f sites. The Bi3+ ions labelled 1–4 in (c) correspond to those labelled 1–4 in (b).[8]

Bismuth(III) oxide is perhaps the most industrially important compound of bismuth. It is also a common starting point for bismuth chemistry. It is found naturally as the mineral bismite (monoclinic) and sphaerobismoite (tetragonal, much more rare), but it is usually obtained as a by-product of the smelting of copper and lead ores. Bismuth trioxide is commonly used to produce the "Dragon's eggs" effect in fireworks, as a replacement of red lead.
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