The fact that 2Ca2+ and 1Nb5+ ions are able to substitut e for 3In3+ ions on the B-sites of the Ca compounds is an intriguing phenomen on and attests to the well-documen ted structural flexibility of the perovskite structure type.
这句话是对这个结构的一个简要的解释，我也不是很懂，希望大家帮帮忙！
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