A Copper-Formate Framework Showing a Simple to Helical Antiferroelectric   Transition with Prominent Dielectric Anomalies and Anisotropic Thermal   Expansion, and Antiferromagnetism

doi:10.1002/chem.201403466

CORC > 北京大学 > 化学与分子工程学院

	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).