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!