The dimensional reduction theory is applied to an A_(2)O-P_(2)O_(5)-Bi_(2)O_(3) system where P_(2)O_(5) serves as a binary parent while A_(2)O and Bi_(2)O_(3) are regarded as dimensional reduction agents.Thus,three no...The dimensional reduction theory is applied to an A_(2)O-P_(2)O_(5)-Bi_(2)O_(3) system where P_(2)O_(5) serves as a binary parent while A_(2)O and Bi_(2)O_(3) are regarded as dimensional reduction agents.Thus,three novel phosphates ACs_(5)Bi_(4)(PO_(4))_(2)(P_(2)O_(7))_(3)(A=K,Rb and Cs)have been prepared through the high-temperature solution method.Single-crystal X-ray diffraction measurements reveal that they all crystallize in the monoclinic space group P_(2)1/c(no.14)and in their structures,two different kinds of P-O units,i.e.isolated PO_(4) tetrahedra and P_(2)O_(7) dimers,are interconnected by Bi-O groups to construct a ^(3)_(∞)[Bi_(4)(PO_(4))_(2)(P_(2)O_(7))_(3)^(6-)]framework.Note that with the change of cationic size in their structures,the Bi^(3+)cations also exhibit flexible coordination,i.e.BiO_(5) and BiO_(6) polyhedra in KCs_(5)Bi_(4)(PO_(4))_(2)(P_(2)O_(7))_(3) and only BiO_(6) polyhedra in Cs_(6)Bi_(4)(PO_(4))_(2)(P_(2)O_(7))_(3),suggesting that combining the flexible coordination of Bi^(3+)cations with phosphates based on dimensional reduction theory is an effective strategy to guide the synthesis of new compounds.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.51802217,22071179,51972230,51890864,and 51890865)Natural Science Foundation of Tianjin(Grant No.20JCJQJC00060 and 19JCZDJC38200)the National Key R&D Program(Grant No.2016YFB0402103).
文摘The dimensional reduction theory is applied to an A_(2)O-P_(2)O_(5)-Bi_(2)O_(3) system where P_(2)O_(5) serves as a binary parent while A_(2)O and Bi_(2)O_(3) are regarded as dimensional reduction agents.Thus,three novel phosphates ACs_(5)Bi_(4)(PO_(4))_(2)(P_(2)O_(7))_(3)(A=K,Rb and Cs)have been prepared through the high-temperature solution method.Single-crystal X-ray diffraction measurements reveal that they all crystallize in the monoclinic space group P_(2)1/c(no.14)and in their structures,two different kinds of P-O units,i.e.isolated PO_(4) tetrahedra and P_(2)O_(7) dimers,are interconnected by Bi-O groups to construct a ^(3)_(∞)[Bi_(4)(PO_(4))_(2)(P_(2)O_(7))_(3)^(6-)]framework.Note that with the change of cationic size in their structures,the Bi^(3+)cations also exhibit flexible coordination,i.e.BiO_(5) and BiO_(6) polyhedra in KCs_(5)Bi_(4)(PO_(4))_(2)(P_(2)O_(7))_(3) and only BiO_(6) polyhedra in Cs_(6)Bi_(4)(PO_(4))_(2)(P_(2)O_(7))_(3),suggesting that combining the flexible coordination of Bi^(3+)cations with phosphates based on dimensional reduction theory is an effective strategy to guide the synthesis of new compounds.
