Abstract
Lanthanum (La) has been used for the first time as an additive in the sol–gel precursor lithium aluminosilicate (Li 2O–Al 2O 3–2SiO 2) to prepare β-eucryptite at different temperatures. The influence of La additive on the phase transition of β-eucryptite was studied by X-ray diffraction and differential scanning calorimetry. Scanning electron microscope analysis showed that plenty of large aspect ratio rod-like β-eucryptite was formed in the sample containing La additive at 1180 °C, and then gradually disappeared at higher sintering temperature. The La additive formed a low-temperature liquid phase LiLaSiO 4 and promoted the crystal growth of β-eucryptite at 1350 °C. Li + conductivity of bulk β-eucryptite with La additive was higher than that without La additive below 603 K.
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