偏铝酸锂

偏铝酸锂
系统名
Lithium(1+) aluminate
别名 铝酸锂
识别
CAS号 12003-67-7  
PubChem 123268
ChemSpider 109880
SMILES
InChI
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
ΔfHmo298K -1188.670 kJ/mol[1]
So298K 53.35 J/mol·K [1]
若非注明,所有数据均出自一般条件(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

早期方法

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

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。[4]

参考文献

  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. 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)
  4. 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
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