BaTi $\left[{\mathrm{S}\mathrm{i}}_3{\mathrm{O}}_9\right]$ is a class of

The primary unit of BaTi( ${\mathrm{S}\mathrm{i}}_3{\mathrm{O}}_9)$ or $\left(\mathrm{S}{\mathrm{i}}_3{\mathrm{O}}_9^{6-}\right)$ is ${\left(\mathrm{S}\mathrm{i}{\mathrm{O}}_3\right)}^{2-}\mathrm{}$ (as n = 3). Thus, it is formed by sharing of two oxygen per Si atom and results in the formation of cyclic silicate.