The structural formula of Ln9.33Si6O26 with P63/m symmetry can be expressed as [LnF3.33□0.67][LnT6][(SiO4)6][O2].6 In terms of descriptive crystallography, rigid SiO4 tetrahedra are
corner-connected to LnFO6 metaprisms that form a framework surrounding the LnT atoms, which in turn enclose the tunnel oxygen. To satisfy charge balance, this compound is cation-defificient with the Ln vacancies located at the framework site.It has been suggested that these cation vacancies create space for interstitial oxygen,9 enabling alternative O2− transport
paths with lower activation energies. Thus, electrolyte performance is controlled by the cation vacancy and O2− interstitial concentration. For example, in La9.33+x/3□0.67‑x/3AlxSi6−xO26 (0 ≤ x ≤ 2) apatite, the chemical tailoring of Al content (□La + 3Si4+ → La3+ + 3Al3+ most simply) balances steric enhancement due to larger Al expanding the conducting channel against vacancy removal that blocks conduction.这段话怎么理解
metaprisms、chemical tailoring of Al是什么意思
tunnel oxygens和interstitial oxygen的关系
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