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偏铝酸锂

偏铝酸锂
IUPAC名
Lithium aluminate
系统名
Lithium(1+) aluminate
别名 铝酸锂
识别
CAS号 12003-67-7  checkY
PubChem 123268
ChemSpider 109880
SMILES
 
  • [Li+].[O-][Al]=O
InChI
 
  • 1/Al.Li.2O/q;+1;;-1/rAlO2.Li/c2-1-3;/q-1;+1
InChIKey YQNQTEBHHUSESQ-YICCBGQXAE
EINECS 234-434-9
MeSH Lithium+aluminate
性质
化学式 AlLiO2
摩尔质量 65.92 g·mol−1
外观 白色晶体
密度 2.615 g/cm3(固体)
熔点 1625 °C(1898 K)
溶解性 难溶
热力学
ΔfHm298K -1188.670 kJ/mol[1]
S298K 53.35 J/mol·K [1]
若非注明,所有数据均出自标准状态(25 ℃,100 kPa)下。

偏铝酸锂是一种无机化合物,化学式为LiAlO2,是锂的铝酸盐之一。

制备

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早期方法

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偏铝酸锂粉末的制备是基于Al
2
O
3
和含锂化合物如Li
2
CO
3
、LiOH、Li
2
O
、LiAc等的固相反应,反应温度为400 - 1000℃。由于锂在高温下的挥发与来自研磨设备的污染,一定粒径的纯净的偏铝酸锂难以合成。[2]

现代方法

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偏铝酸锂有多种方法可以合成,如湿法、溶胶-凝胶法、模板剂法、前驱体法、燃烧法等。固相法制得的产物是α-LiAlO
2
;湿法主要则会得到两相——α-LiAlO
2
γ-LiAlO
2
[3]六方结构的α-LiAlO2(低温相)在修饰后会得到高温相的γ-LiAlO2,有着四方晶系的结构(约900℃)。介稳的的β相有着单斜晶胞,它在900℃会转化为γ相。[2]

参考文献

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  1. ^ 1.0 1.1 R. Robie, B. Hemingway, and J. Fisher, “Thermodynamic Properties of Minerals and Related Substances at 298.15K and 1bar Pressure and at Higher Temperatures,” US Geol. Surv., vol. 1452, 1978.
  2. ^ 2.0 2.1 Chatterjee & Naskar “Novel technique for the synthesis of lithium aluminate (LiAlO2) powders from water-based sols” Journal of Materials Science Letters, Vol 22, Issue 24, pp 1747-1749
  3. ^ Synthesis of lithium aluminate by thermal decomposition of a lithium dawsonite-type precursor J. Jimenez-Becerril & I. Garcia-Sosa, Journal of Ceramic Processing Research. Vol. 12, No. 1, pp. 52-56 (2011)
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偏铝酸锂
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