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Search Publications by: Joshua B Martin (Fed)

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Displaying 26 - 50 of 54

Seebeck Coefficient Metrology: Do Contemporary Protocols Measure Up?

January 29, 2015
Author(s)
Joshua B. Martin, Winnie K. Wong-Ng, Martin L. Green
Comparative measurements of the Seebeck coefficient are challenging due to the diversity of instrumentation and measurement protocols. With the implementation of standardized measurement protocols and the use of Standard Reference Materials (SRMs®), for

Bottom-up processing and low temperature transport properties of polycrystalline SnSe

January 13, 2015
Author(s)
Zhen-Hua Ge, Kaya Wei, Hutton Lewis, Joshua Martin, George S. Nolas
A simple hydrothermal approach was employed to synthesize SnSe nanorods. Micro sized flower shaped crystals were obtained under reaction temperatures below 180°C and nanorods were obtained at a reaction temperature of 180°C, the "flowers" changed to rods

High Throughput Screening Tools for Thermoelectric Materials

December 4, 2014
Author(s)
Winnie K. Wong-Ng, Yonggao Yan, Makoto Otani, Joshua B. Martin, Kevin R. Talley, Sara C. Barron, David L. Carroll, C Hewitt, Howard Joress, Evans L. Thomas, Martin L. Green, Xinfeng Tang
A suite of complementary high-throughput screening systems for combinatorial films was developed at NIST to facilitate the search for efficient thermoelectric materials. These custom-designed capabilities include a facility for combinatorial thin film

Synthesis, transport properties, and electronic structure of Cu2CdSnTe4

June 26, 2014
Author(s)
Yongkwan Dong, Artem R. Khabibullin, Kaya Wei, Zhen-Hua Ge, Joshua Martin, James Salvador, Lilia Woods, George S. Nolas
A new stannite phase was synthesized and its temperature dependent transport properties were investigated. It is found that the electrical resistivity increases with increasing temperature. Hall and Seebeck coefficient measurements indicate Cu2CdSnTe4

Flux growth of Yb6.6Ir6Sn16 having mixed valent ytterbium

June 12, 2014
Author(s)
Sebastian Peter, Udumula Subbarao, Sudhindra Rayaprol, Joshua Martin, Mahalingam Balasubramanian, Christos D. Malliakas, Mercouri G. Kanatzidis
The new compound Yb6.6Ir6Sn16 was obtained as single crystals in high yield from the reaction of Yb with Ir and Sn run in excess indium. Single crystal X-ray diffraction analysis shows that Yb6.6Ir6Sn16 crystallizes in the tetragonal space group P42/nmc

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

Electronic structure of Ba-Ga-Ge-Si Type I Clathrates: A Ge and Ga K-Edge Study

November 9, 2012
Author(s)
Winnie Wong-Ng, Azzam Mansour, Joshua Martin, George S. Nolas
XANES spectroscopy was successfully used to study changes in the density of unoccupied states for silicon substituted Ba8Ga16Ge30-xSix type I clathrates. Partial density of unoccupied states with p character is modified for both Ga and Ge upon Si

High temperature thermoelectric properties of p-type skutterudites BaxYbyCo4-zFezSb12

October 23, 2012
Author(s)
Yongkwan Dong, Pooja Puneet, Terry M. Tritt, Joshua Martin, George S. Nolas
Several polycrystalline p-type skutterudites with compositions BaxYbyCo4-zFezSb12, with varied filler concentrations x and y, and z = 1 to 2, have been synthesized by first reacting the constituents and subsequent solid state annealing, followed by

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

Computational Seebeck Coefficient Measurement Simulations

May 2, 2012
Author(s)
Joshua B. Martin
We have employed finite element analysis to develop computational Seebeck coefficient metrology simulations. This approach enables a unique exploration of multiple probe arrangements and measurement techniques within the same temporal domain. To

Thermoelectric Properties and Structural Variations in Bi2Te3-xSx Crystals

February 23, 2012
Author(s)
Winnie K. Wong-Ng, Howard Joress, Joshua B. Martin, Peter Zavalij, Yonggao Y. Yan, Jihui Yang
We have successfully correlated the thermoelectric properties, structure and compositional variations of a Bi2Te3-xSx single crystal using a custom-designed, non-destructive, high-throughput Seebeck coefficient screening tool, together with a single

Development of a Seebeck Coefficient Standard Reference Material (SRM)

August 1, 2011
Author(s)
Nathan Lowhorn, Winnie Wong-Ng, John Lu, Joshua B. Martin, Martin L. Green, John E. Bonevich, Evan L. Thomas, Neil Dilley, Jeff Sharp
We have successfully developed a Seebeck coefficient Standard Reference Material (SRM™), Bi2Te3, that is essential for interlaboratory data comparison and for instrument calibration. Certification measurements were performed using a differential steady

APPLICATIONS OF HIGH-THROUGHPUT SCREENING TOOLS FOR THERMOELECTRIC MATERIALS

June 21, 2011
Author(s)
Winnie K. Wong-Ng, Howard L. Joress, Joshua B. Martin, Yonggao Y. Yan, Jihui Yang, Makoto Otani, Evan L. Thomas, Martin L. Green, Jason Hattrick-Simpers
The increased research and development on thermoelectric materials in recent years has been driven primarily by the need for improved efficiency in the global utilization of energy resources. To facilitate the search for new thermoelectric materials, we

Study of Nanostructure Inclusion Effects on the Thermoelectric Behavior of Ca3Co4O9 Thin Films Grown by Pulsed Laser Deposition

February 1, 2011
Author(s)
Winnie K. Wong-Ng, Evans L. Thomas, Xueyan Song, Yonggao Y. Yan, Joshua B. Martin, Margaret Ratcliff, Paul N. Barnes
The influence of incorporating nanoparticulate additions into Ca3Co4O9 (CCO) thin films prepared by pulsed laser deposition using composite targets of CCO + BaZrO3 (BZO) on Si, LaAlO3 and Al2O3 substrates is investigated. X-ray data and high-resolution

High Temperature Seebeck Coefficient Metrology

December 22, 2010
Author(s)
Joshua B. Martin, Terry M. Tritt, Winnie K. Wong-Ng, Ctirad Uher
We present an overview of the challenges and practices of thermoelectric metrology at high temperature (300 K-1300 K). The Seebeck coefficient, when combined with thermal and electrical conductivity, is a useful property measurement for evaluating the

Low temperature transport properties and heat capacity of single-crystal Na8Si46

November 17, 2010
Author(s)
Stevce Stefanoski, Joshua B. Martin, George S. Nolas
The low temperature thermal conductivity, resistivity, and Seebeck coefficient of single-crystal Na8Si46 are investigated revealing the intrinsic low temperature transport properties of this material. Metallic conduction is observed, with a higher residual

New Intermetallics YbAu2In4 and Yb2Au3In5

October 20, 2010
Author(s)
Peter C. Sebastian, James Salvador, Joshua B. Martin, Mercouri G. Kanatzidis
The intermetallic compounds YbAu2In4 and Yb2Au3In5 were obtained as single crystals in high yield from reactions run in liquid indium. Single crystal X-ray diffraction data of YbAu2In4 showed that it crystallizes as a new structure type in the monoclinic
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