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Search Publications by: Joshua B Martin (Fed)

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Displaying 26 - 50 of 102

Physical properties of madocite: A quaternary chalcogenide with very low thermal conductivity

April 25, 2017
Author(s)
Kaya Wei, Joshua B. Martin, Satofumi Maruyama, Lukasz Wojtas, Takao Mori, George S. Nolas
The madocite Pb17(Sb0.75As0.25)16S41 was synthesized by reaction of binary compounds and densified using hot pressing. The optical band-gap, thermal stability, and temperature-dependent heat capacity and thermal conductivity are reported for the first time

BC8 Silicon (Si-III) is a narrow-gap semiconductor

April 7, 2017
Author(s)
Haidong Zhang, Hanyu Liu, Kaya Wei, Oleksandr Kurakevych, Zhenxian Liu, Yann Godec, Joshua B. Martin, Michael Guerrette, George S. Nolas, Timothy A. Strobel
Large-volume, phase-pure synthesis of BC8 silicon (Ia3 ̅, cI16) has enabled bulk measurements of optical, electronic and thermal properties. Unlike previous reports that conclude BC8-Si is semimetallic, we demonstrate that this phase is a direct band gap

International Round-Robin Study on Thermoelectric Transport Properties of n-type Half-Heusler from 300 K to 773 K

September 3, 2015
Author(s)
Hsin Wang, Shengqiang Bai, Lidong Chen, Alexander Cuenat, Giri Joshi, Holger Kleinke, Jan K?nig, Hee Woong Lee, Joshua B. Martin, Min-Wook Oh, Wallace Porter, Zhifeng Ren, James Salvador, Jeff Sharp, Patrick Taylor, Alan J. Thompson, Y. C. Tseng
International transport property measurement round-robins have been conducted by the Thermoelectric Annex under the International Energy Agency (IEA) Implementing Agreement on Advanced Materials for Transportation (AMT). The previous round-robins used

Enhanced Thermoelectric Properties for Cu2ZnSnSe4 with Ga-doping

August 22, 2015
Author(s)
Kaya Wei, Laura Beauchemin, Hsin Wang, Joshua B. Martin, George S. Nolas
Gallium doped Cu2ZnSnSe4 quaternary chalcogenides with and without excess Cu have been synthesized by elemental reaction and densified using hot pressing in order to investigate their high temperature thermoelectric properties. The resistivity, ρ, and

Synthesis and Characterization of Bournonite PbCuSbS3 Nanocrystals

July 10, 2015
Author(s)
Kaya Wei, Joshua B. Martin, James Salvador, George S. Nolas
PbCuSbS3 nanocrystals were synthesized for the first time by a colloidal synthesis route and characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDS). The particle size of

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 B. 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