Normal spectral emissivity changes of tungsten at 633 nm in the range from room temperature to melting point under pulse-heating conditions

2002 ◽  
Author(s):  
Chengwei Li ◽  
Fan Yi ◽  
Jingmin Dai
Keyword(s):  
Melting Point ◽  
Room Temperature ◽  
Pulse Heating ◽  
Spectral Emissivity ◽  
Normal Spectral Emissivity

(Sm1-x,Cax)MnO3 Ceramics with Tunable Emissivity

2008 ◽  
Vol 55 ◽  
pp. 13-17
Author(s):  
Patrick Laffez ◽  
Cecile Napierala ◽  
R. Ammar ◽  
V. Ta Phuoc ◽  
Mustapha Zaghrioui
Keyword(s):  
Fourier Transform ◽  
Room Temperature ◽  
Spectral Emissivity ◽  
Absolute Temperature ◽  
Charge Ordering ◽  
Apparent Temperature ◽  
Normal Spectral Emissivity ◽  
Infrared Reflectance ◽  
Sharp Transition ◽  
Ordering Transition

The reversible charge ordering transition of (Sm1-x,Cax)MnO3 is associated with strong changes in electrical, magnetic and infrared properties. In this work, normal spectral emissivity is calculated from infrared reflectance of bulk polished ceramics, measured by Fourier Transform Infrared Spectroscopy (FTIR). Emissivity versus temperature shows a sharp transition at the charge ordering transition. By comparing the apparent temperature of the sample with the absolute temperature, we show that (Sm1-x,Cax)MnO3 is a good candidate for infrared furtivity around room temperature.

scholarly journals Re-investigation of the Normal Spectral Emissivity at 684.5 nm of Solid and Liquid Molybdenum

2020 ◽  
Vol 42 (2) ◽  
Author(s):  
Alexander Eber ◽  
Peter Pichler ◽  
Gernot Pottlacher
Keyword(s):  
Liquid Phase ◽  
Pulse Heating ◽  
Spectral Emissivity ◽  
Measuring System ◽  
Normal Spectral Emissivity ◽  
The Novel

AbstractIn this work, we present normal spectral emissivity data of solid and liquid molybdenum at a wavelength of 684.5 nm. The presented results are novel measurements on molybdenum, a material, which was already measured 15 years ago by our group. The present results indicate a lower emissivity in the liquid phase. The novel measurements were done within the European Metrology Programme for Innovation and Research (EMPIR) project 17IND11 Hi-TRACE. The optimized measuring system is an ohmic pulse-heating apparatus combined with microsecond Division of Amplitude polarimetry.

MODELING THE NORMAL SPECTRAL EMISSIVITY OF BRASS H62 AT 800–1100 K DURING OXIDE LAYER GROWTH

2018 ◽  
Vol 49 (15) ◽  
pp. 1445-1458
Author(s):  
Deheng Shi ◽  
Fenghui Zou ◽  
Zunlue Zhu ◽  
Jinfeng Sun
Keyword(s):  
Oxide Layer ◽  
Spectral Emissivity ◽  
Layer Growth ◽  
Normal Spectral Emissivity

Novel Chemical Route to Size-Controlled Ta(0) and Ru-Ta Nanoparticles in Ionic Liquids

2012 ◽  
Vol 1473 ◽  
Author(s):  
Inga S. Helgadottir ◽  
Philippe P. Arquillière ◽  
Paul S. Campbell ◽  
Catherine C. Santini ◽  
P.-H. Haumesser
Keyword(s):  
Ionic Liquids ◽  
Melting Point ◽  
Metallic Nanoparticles ◽  
Room Temperature ◽  
Chemical Route ◽  
High Interest ◽  
Microelectronics Industry ◽  
Synthetic Routes ◽  
Size Controlled

ABSTRACTMetallic nanoparticles under 10 nm are of particular interest for the microelectronics industry. However, there is a lack of convenient synthetic routes to control their size Oxophilic metals, such as Ta, are also of high interest, however, the high oxophilicity and melting point makes the synthesis of such nanoparticles challenging. Making use of imidazolium-based ionic liquids, monodisperse zero-valent tantalum nanoparticles (Ta(0)NPs) have been successfully synthesised at room temperature by reduction of tris(neopentyl)neopentylidenetantalum(V). Furthermore; well size-controlled bimetallic Ru-Ta NPs have also been synthesized.

The Characteristic of the La3Ga5SiO14 Single Crystal Grown by Vertical Bridgman Method in Ar Atmosphere

2006 ◽  
Vol 510-511 ◽  
pp. 842-845 ◽  
Author(s):  
Noriko Bamba ◽  
Kentaro Kato ◽  
Toshinori Taishi ◽  
Takayuki Hayashi ◽  
Keigo Hoshikawa ◽  
...  
Keyword(s):  
Melting Point ◽  
Single Crystal ◽  
Single Crystals ◽  
Room Temperature ◽  
Color Change ◽  
Piezoelectric Materials ◽  
Lead Free ◽  
Piezoelectric Constant ◽  
Interstitial Oxygen ◽  
Vertical Bridgman

Langasite (La3Ga5SiO14: denoted by LGS) single crystal is one of the lead free piezoelectric materials with high piezoelectricity that is maintained up to its melting point (1470°C). Although LGS single crystals have usually been grown by Czochralski (CZ) method in oxygen contained atmosphere to prevent evaporation of Ga, they were grown by the vertical Bridgman (VB) method in Ar atmosphere without oxygen, and their properties were evaluated in this work. Transparent and colorless LGS single crystals were successfully obtained without Ga evaporation by the VB method in Ar atmosphere, and their resistivity at room temperature was much higher than that grown by conventional CZ method. Piezoelectric constant d11 of the crystal grown by the VB method was 6 x 10-12 C/N, which was close to that of the crystal grown by CZ method. The colorless transparent LGS single crystal turned to orange and its resistivity decreased by annealing in air. Since an orange-colored transparent LGS single crystal has been grown by conventional CZ method, this indicates that color change and the resistivity decrease of LGS crystal is caused by extra interstitial oxygen atoms in the crystal.

Study of the normal spectral emissivity of tungsten between 170 and 500 °C by a single-wavelength infrared thermometer

2021 ◽  
Vol 173 ◽  
pp. 112848
Author(s):  
Shuangbao Shu ◽  
Ziyi Wang ◽  
Huajun Liang ◽  
Yuzhong Zhang ◽  
Chengliang Pan ◽  
...  
Keyword(s):  
Spectral Emissivity ◽  
Normal Spectral Emissivity ◽  
Infrared Thermometer
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