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Displaying 51 - 75 of 98

Multiferroicity in Doped Hexagonal LuFeO 3

August 27, 2015
Author(s)
Steven M. Disseler, Xuan Luo, Bin Gao, Yoon Seok Oh, Rongwei Hu, Yazhong Wang, Dylan Quintana, Alexander Zhang, Qingzhen Huang, June W. Lau, Rick L. Paul, Jeffrey W. Lynn, Sang-Wook Cheong, William D. Ratcliff
The hexagonal phase of LuFeO 3 is a rare example of a multiferroic material possessing a weak ferromagnetic moment, which is predicted to be switchable by an electric field. We stabilize this structure in bulk form through Mn and Sc doping, and determine

An Itinerant Antiferromagnetic Metal Without Magnetic Constituents

July 13, 2015
Author(s)
E. Svanidze, Jiakui K. Wang, Tiglet Besara, L. Liu, Qingzhen Huang, T. Siegrist, Benjamin Frandsen, Jeffrey W. Lynn, Andriy H. Nevidomskyy, Monica Barbara Gamza, M.C. Aronson, Y.J. Uemura, E. Morosan
Itinerant and local moment magnetism have substantively different origins, and require distinct theoretical treatment. A unified theory of magnetism has long been sought after, and remains elusive, mainly due to the limited number of known itinerant

Invar-like Behavior of Antiperovskite Mn 3+x Ni 1-x N Compounds

March 5, 2015
Author(s)
Sihao Deng, Ying Sun, Hui Wu, Qingzhen Huang, Jun Yan, Kewen Shi, Muhammad Imran Malik, Huiqing Lu, Lei Wang, Rongjin Huang, Laifeng Li, Cong Wang
The antiperovskite Mn 3+xNi 1-xN compounds have been synthesized and characterized by a variety of experimental techniques. After Mn doping at Ni site, both ferromagnetic characteristics and Invar-like effect were observed in the antiferromagnetic host

Coexistence of Superconductivity and Antiferromagnetism in (Li 0.8 Fe 0.2 ) OHFeSe

March 1, 2015
Author(s)
X. F. Lu, N. Z. Wang, Hui Wu, Y. P. Wu, D. Zhao, X. Z. Zeng, X. G. Luo, T. Wu, W. Bao, G. H. Zhang, F. Q. Huang, Qingzhen Huang, X. H. Chen
FeSe-derived superconductors show some unique behaviors relative to iron-pnictide superconductors, which are very helpful to understand the mechanism of superconductivity in high-T c iron-based superconductors. The low-energy electronic structure of the

Giant Negative Thermal Expansion in Bonded MnCoGe-Based Compounds with Ni 2 In-Type Hexagonal Structure

February 11, 2015
Author(s)
Ying-Ying Zhao, Feng-Xia Hu, Li-Fu Bao, Jing Wang, Hui Wu, Qingzhen Huang, Rong-Rong Wu, Yao Liu, Fei-Ran Shen, Hao Kuang, Ming Zhang, Wen-Liang Zuo, Xin-Qi Zheng, Ji-Rong Sun, Bao-Gen Shen
MnCoGe-based compounds undergo a large negative thermal expansion (NTE) during the martensitic structural transition from Ni 2In-type hexagonal to TiNiSi-type orthorhombic structure. High resolution neutron diffraction experiments revealed that the

Phase Diagram of the Relaxor Ferroelectric (1-x)Pb(Mg 1/3 Nb 2/3 )O 3-x PbTiO 3 Revisted: A neutron Powder Diffraction Study of the Relaxor Skin Effect

January 19, 2015
Author(s)
Daniel Phelan, Efrain E. Rodriguez, J Gao, Y Bing, Z.-G. Ye, Qingzhen Huang, Jinsheng Wen, Guangyong Xu, C. Stock, M Matsuura, Peter M. Gehring
We revisit the phase diagram of the relaxor ferroelectric PMN-xPT using neutron powder diffraction to test suggestions that residual oxygen vacancies and/or strain affect the ground state crystal structure. Powdered samples of PMN-xPT were prepared with

Structure and Magnetic Properties of the a-NaFeO 2 -Type Honeycomb Compound Na 3 Ni 2 BiO 6

November 15, 2014
Author(s)
Elizabeth M. Seibel, J. H. Roudebush, Hui Wu, Qingzhen Huang, Mazhar N. Ali, Huiwen Ji, R. J. Cava
We present the structure and magnetic properties of Na 3Ni 2BiO 6, which is an ordered variant of the α-NaFeO 2 structure type. This layered compound has a 2:1 ordering of (Ni 2+/Bi 5+)O 6 octahedra within the a-b plane and sodium in octahedra between the

Tunable Cobalt Vacancies and Related Properties in LaCo x As 2

October 21, 2014
Author(s)
Shijie Shen, Gang Wang, Shifeng Jin, Qingzhen Huang, Tianping Ying, Dandan Li, Xiaofang Lai, Tingting Zhou, Han Zhang, Zhiping Lin, Xiaozhi Wu, Xiaolong Chen
The origin of transition metal vacancies and their effects on the properties of ThCr 2Si 2-type compounds have been less studied and poorly understood. Here we carefully investigate the structure, physical properties, and electronic structure for a series

Structural characterization of Bi2Te3 and Sb2Te3 as a Function of Temperature Using Neutron Powder Diffraction (NPD) and Extended X-ray Absorption Fine Structure (EXAFS) Techniques

August 28, 2014
Author(s)
Winnie Wong-Ng, Azzam Mansour, Qingzhen Huang, Weihua Tang, Jeff Sharp, Alan Thompson
The structure of Bi2Te3 (Seebeck coefficient Standard Reference Material (SRM™ 3451)), and the related phase Sb2Te3 have been characterized as a function of temperature using the neutron powder diffraction (NPD) and the extended X-ray absorption fine

Ordered Structure and Thermal Expansion in Tungsten Bronze Pb 2 K 0.5 Li 0.5 Nb 5 O 15

August 12, 2014
Author(s)
Kun Lin, Yangchun Rong, Hui Wu, Qingzhen Huang, Li You, Yang Ren, Longlong Fan, Jun Chen, Xianran Xing
The crystal structure and thermal expansions of a new tetragonal tungsten bronze (TTB) ferroelectrics Pb 2K 0.5Li 0.5Nb 5O 15 were systematically investigated by selected area electron diffraction (SAED), neutron powder diffraction, synchrotron XRD, and

Phase Transitions and Magnetocaloric Effect in Mn 3 Cu 0.89N d0.96^

August 1, 2014
Author(s)
Jun Yan, Ying Sun, Hui Wu, Qingzhen Huang, Cong Wang, Zaixing Shi, Sihao Deng, Kewen Shi, Huiqing Lu, Lihua Chu
We report the large magnetic entropy change observed in the antiperovskite Mn 3Cu 0.89N 0.96. Based in the heat flow peak measured by differential scanning calorimeter (DSC), the total entropy change according to the structural transition (tetragonal to

Phase Equilibria and Crystal Chemistry of the CaO-?Nd2O3-CoOz System at 885 degC in Air

March 18, 2014
Author(s)
Winnie K. Wong-Ng, William Laws, Kevin R. Talley, Qingzhen Huang, Jun Yan, Joshua B. Martin, James A. Kaduk
The phase diagram of the CaO-¿Nd2O3-CoOz system at 885 °C in air has been determined. The system consists of two calcium cobaltate compounds that have promising thermoelectric properties, namely, the 2D thermoelectric oxide solid solution, (Ca3-xNdx)Co4O9

Structure and Properties of a-NaFeO 2 -type Ternary Sodium Iridates

February 1, 2014
Author(s)
Kristen Baroudi, Cindi Yim, Hui Wu, Qingzhen Huang, John H. Roudebush, Eugenia Vavilova, Hans-Joachim Grafe, Vladislav Kataev, Bernd Buechner, Huiwen Ji, Changyang Kuo, Zhiwei Hu, Tun-Wen Pi, Chiwen Pao, Jyhfu Lee, Daria Mikhailova, Liu Hao Tjeng, R. J. Cava
The synthesis, structure, and elementary magnetic and electronic properties are reported for layered compounds of the type Na 3-xMIr 2O 6 and Na 3-xM 2IrO 6, where M is a transition metal from the 3d series (M=Zn, Cu, Ni, Co, Fe and Mn). The rhombohedral

Effectively Control Negative Thermal Expansion of Single-phase Ferroelecrics of PbTiO 3 -(Bi,La)FeO 3 over a Giant Range

August 16, 2013
Author(s)
Jun Chen, Fangfang Wang, Qingzhen Huang, Lei Hu, Xiping Song, Jinxia Deng, Ranbo Yu, Xianran Xing
Control of negative thermal expansion is a fundamentally interesting topic in the negative thermal expansion materials in order for the future applications. However, it is a challenge to control the negative thermal expansion in individual pure materials

Investigation of NaY Zeolite with Adsorbed CO2 by Neutron Powder Diffraction

May 17, 2013
Author(s)
Winnie K. Wong-Ng, James A. Kaduk, Qingzhen Huang, Laura Espinal, Lan (. Li, Jacob W. Burress
The crystal structure of dehydrated NaY zeolite (Na-FAU structure type) with and without adsorbed CO2 has been determined at 4K and at room temperature (RT) using neutron powder diffraction techniques. The CO2-containing sample was prepared at -78 °C and 0

Crystal Structure of NaY Zeolite with Adsorbed CO2 by Neutron Powder Diffraction

January 29, 2013
Author(s)
Winnie K. Wong-Ng, James A. Kaduk, Qingzhen Huang, Laura Espinal, Martin L. Green
The crystal structure of dehydrated NaY zeolite (Na-FAU structure type) with and without adsorbed CO2 has been determined at room temperature (RT) and at 4 K using neutron powder diffraction techniques. The CO2-containing sample was prepared at -78 °C and

Bi2Te3 and Bi2Te3-xSx FOR THERMOELECTRIC APPLICATIONS

October 15, 2012
Author(s)
Winnie K. Wong-Ng, N D. Lowhorn, Joshua B. Martin, Peter Zavalij, Howard Joress, Qingzhen Huang, Yonggao Y. Yan, Azzam Mansour, Evans L. Thomas, Jihui Yang, Martin L. Green
The increased interest in research and development on thermoelectric materials is partly due to the need for improved efficiency in the global utilization of energy resources. Historically, Bi2Te3 occupies an important position in the thermoelectric

Crystal Structure of the Type I Clathrate Ba8Ni4Ge42

March 30, 2012
Author(s)
Winnie K. Wong-Ng, Qingzhen Huang, Igor Levin, Joseph C. Woicik, Xun Shi, Jihui Yang, James A. Kaduk
The crystal structure of Type-I clathrate Ba8Ni4Ge42 has been determined using neutron powder diffraction, transmission electron microscopy (TEM, for possible superlattice), extended X-ray absorption fine structure measurements. Ba8Ni4Ge42 is cubic with

Adjustable Zero Thermal Expansion in Antiperovskite Manganese Nitride

October 25, 2011
Author(s)
Xiaoyan Song, Zhonghua Sun, Qingzhen Huang, Markus Rettenmayr, Xuemei Liu, Martin Seyring, Guannan Li, Guanghui Rao, Fuxing Yin
The zero thermal expansion (ZTE) behavior particularly with a wide operating temperature range in a single material is extremely uncommon. With the clear experimental evidence we report a universal mechanism that controls the ZTE behavior of the

CHEMICAL INTERACTIONS OF THE Ba2YCu3O6+x SUPERCONDUCTOR WITH COATED CONDUCTOR BUFFER LAYERS

August 30, 2011
Author(s)
Winnie K. Wong-Ng, Zhi Yang, Guangyao Liu, Qingzhen Huang, Lawrence P. Cook, Shailee P. Diwanji, Christopher E. Lucas, Mi-Hye Jang, James A. Kaduk
Continued research on high Tc superconductors has led to the promise of a wide variety of industrial applications. To implement these applications, the availability of low-cost, long-length, and high-performance superconductor wire/tape and cable is

Phase Equilibria, Crystal Chemistry and Thermoelectric Properties of Compounds in the Ca-Co-Zn-O System

June 21, 2011
Author(s)
Winnie K. Wong-Ng, Tana Luo, Wenjie Xie, Weihua Tang, James A. Kaduk, Qingzhen Huang, Yonggao Y. Yan, Soma Chattopadhyay
In the Ca-Co-Zn-O system, we have determined the tie-line relationships and the thermoelectric properties, solid solution limits, and structures of two low-dimensional cobaltite series, Ca3(Co, Zn)4O9 and Ca3(Co,Zn)2O6 at 885 C in air. In Ca3(Co,Zn)4O9