`Li_(2)CO_(3)` decomposes readily whereas other carbonates are not. Why?

Explanation

The carbonates `(M_(2)CO_(3))` of alkali metals are remarkably more stable upto 1270K above which they first melt and then decompose to form their oxides, whereas `Li_(2)CO_(3)` is less stable and decomposes readily
`Li_(2)CO_(3) + /_\ to Li_(2)O + CO_(2)uarr`
This is due to the large size difference between `Li^(+)` and `Co_(3)^(2-)` which makes the crystal lattice unstable