A Copper-Formate Framework Showing a Simple to Helical Antiferroelectric Transition with Prominent Dielectric Anomalies and Anisotropic Thermal Expansion, and Antiferromagnetism | |
Shang, Ran ; Chen, Sa ; Wang, Zhe-Ming ; Gao, Song | |
刊名 | chemistry a european journal |
2014 | |
关键词 | anisotropic thermal expansion antiferroelectricity antiferromagnetism dielectric anomaly metal formate phase transition METAL-ORGANIC FRAMEWORK NEGATIVE LINEAR COMPRESSIBILITY X-RAY-DIFFRACTION WEAK FERROMAGNETISM MAGNETIC-PROPERTIES MOLECULAR MAGNETISM BOND REARRANGEMENT RATIONAL DESIGN POROUS SOLIDS MULTIFERROICS |
DOI | 10.1002/chem.201403466 |
英文摘要 | We present here the compound [NH4][Cu(HCOO) 3], a new member of the [NH4][M(HCOO) 3] family. The JahnTeller Cu2+ ion leads to a distorted 4(9) 6(6) chiral Cu-formate framework. In the low-temperature (LT) orthorhombic phase, the Cu2+ is in an elongated octahedron, and the NH_4 ions in the framework channel are off the channel axis. From 94 to 350 K the NH4- ion gradually approaches the channel axis and the related modulation of the framework and the hydrogen- bond system occurs. The LT phase is simple antiferroelectric (AFE). The material becomes hexagonal above 355 K. In the high-temperature (HT) phase, the Cu2+ octahedron is compressed, and the NH_4 ions are arranged helically along the channel axis. Therefore, the phase transition is one from LT simple AFE to HT helical AFE. The temperature-dependent structure evolution is accompanied by significant thermal and dielectric anomalies and anisotropic thermal expansion, due to the different status of the NH4- ions and the framework modulations, and the structure-property relationship was established based on the extensive variable-temperature single-crystal structures. The material showed long range ordering of antiferromagnetism (AFM), with low dimensional character and a N el temperature of 2.9 K. Therefore, within the material AFE and AFM orderings coexist in the low-temperature region.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000345234900030&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Chemistry, Multidisciplinary; SCI(E); EI; PubMed; 7; ARTICLE; zmw@pku.edu.cn; gaosong@pku.edu.cn; 48; 15872-15883; 20 |
语种 | 英语 |
内容类型 | 期刊论文 |
源URL | [http://ir.pku.edu.cn/handle/20.500.11897/149668] |
专题 | 化学与分子工程学院 |
推荐引用方式 GB/T 7714 | Shang, Ran,Chen, Sa,Wang, Zhe-Ming,et al. A Copper-Formate Framework Showing a Simple to Helical Antiferroelectric Transition with Prominent Dielectric Anomalies and Anisotropic Thermal Expansion, and Antiferromagnetism[J]. chemistry a european journal,2014. |
APA | Shang, Ran,Chen, Sa,Wang, Zhe-Ming,&Gao, Song.(2014).A Copper-Formate Framework Showing a Simple to Helical Antiferroelectric Transition with Prominent Dielectric Anomalies and Anisotropic Thermal Expansion, and Antiferromagnetism.chemistry a european journal. |
MLA | Shang, Ran,et al."A Copper-Formate Framework Showing a Simple to Helical Antiferroelectric Transition with Prominent Dielectric Anomalies and Anisotropic Thermal Expansion, and Antiferromagnetism".chemistry a european journal (2014). |
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