This leads to underbonding (reduced bond valence sum) at the La sites surrounding the oxide-ion channel, which is relieved by the tetrahedral GeO4 units tilting in the triclinic cell.
Underbonding refers to a situation where the bonds between atoms are weaker or shorter than what is expected based on their ideal valence or coordination number. In the context of the sentence you provided, underbonding occurs at the La (lanthanum) sites surrounding the oxide-ion channel. This means that the bonds between the lanthanum atoms and other atoms in their vicinity are not as strong or l ...
Underbonding refers to a situation where the bonds between atoms are weaker or shorter than what is expected based on their ideal valence or coordination number. In the context of the sentence you provided, underbonding occurs at the La (lanthanum) sites surrounding the oxide-ion channel. This means that the bonds between the lanthanum atoms and other atoms in their vicinity are not as strong or long as they should be based on their expected valence or coordination number.
To alleviate this underbonding, the tetrahedral GeO4 units in the triclinic cell tilt. This tilting helps to establish stronger and more suitable bonding between the lanthanum atoms and the oxide-ion channel, thereby resolving the issue of underbonding.
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