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New Polymorphism for Ba 3 Zn 2 (BO 3 ) 3 F with Two Polymorphs Exhibiting Anomalous Phase Transition
Author(s) -
Chen Yanna,
Zhang Wenyao,
An Donghai,
Abudoureheman Maierhaba,
Chen Zhaohui,
Mi Hongyu
Publication year - 2021
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.202001110
Subject(s) - differential scanning calorimetry , crystallography , chemistry , polymorphism (computer science) , diffraction , powder diffraction , phase transition , x ray crystallography , phase (matter) , crystal structure , condensed matter physics , thermodynamics , physics , biochemistry , organic chemistry , genotype , optics , gene
A new polymorph of Ba 3 Zn 2 (BO 3 ) 3 F, α ‐Ba 3 Zn 2 (BO 3 ) 3 F, was synthesized and its structure was determined by single crystal X‐ray diffraction. The two polymorphous phases of Ba 3 Zn 2 (BO 3 ) 3 F are referred to as α ‐ and β ‐Ba 3 Zn 2 (BO 3 ) 3 F according to their synthesis temperature from low to high. Both structures exhibit a similar three‐dimensional (3D) framework, while the two‐dimensional (2D) 2 ∞ [Zn 2 B 2 O 7 ] layers in their structures show different configurations and feature diverse topological structures. Interestingly, an anomalous phase transition, that is, the high‐temperature β ‐phase having a higher density, was observed and further confirmed by detailed structural analyses, which shows that the unusual density evolution mainly originates from the different configurations of 2 ∞ [Zn 2 B 2 O 7 ] layers. Moreover, the phase transformation was characterized by powder X‐ray diffraction (PXRD) and differential scanning calorimetry (DSC) analyses.