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 > 化学研究所 > 中国科学院化学研究所

	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
	2014-11-24
卷号	20 期号:48 页码:15872-15883
关键词	Anisotropic Thermal Expansion Antiferroelectricity Antiferromagnetism Dielectric Anomaly Metal Formate Phase Transition
ISSN号	0947-6539
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.
语种	英语
出版者	WILEY-V C H VERLAG GMBH
WOS记录号	WOS:000345234900030
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/50671]
专题	中国科学院化学研究所
通讯作者	Wang, Zhe-Ming
作者单位	Peking Univ, Coll Chem & Mol Engn, State Key Lab Rare Earth Mat Chem & Applicat, Beijing Natl Lab Mol Sci, Beijing 100871, Peoples R China
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,2014,20(48):15872-15883.
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,20(48),15872-15883.
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 20.48(2014):15872-15883.