Japanese researchers have discovered that a coffee compound boosts the conductivity of organic semiconductors. Could it be time for Japan to make a comeback?
Partial replacement of Sn with Ag is an effective method to optimize the thermoelectric performance of SnSe compounds. However, this approach can easily introduce the AgSnSe2 secondary phase due to the limited solubility of Ag in SnSe. This secondary phase is considered to play positive effects on thermoelectric performance all the way in the previous studies. However, its exact influences on the sample's properties remain ambiguous. Herein, we report a comprehensive study on the crystal structures and the effects of Ag dopant in SnSe polycrystals. Firstly, neutron powder diffraction measurements demonstrate a sudden phase transition nature at 775 K. In addition, we observe a strong competition between the influences from Ag dopant and AgSnSe2 secondary phase. It finds that the precipitation of AgSnSe2 would deplete the carrier concentration and scatter the mobile carriers. Its appearance in the SnSe matrix also suppresses the lattice thermal conductivity, although lower Ag doping
NASF/AESF Foundation Research Project #123: Electrochemical Manufacturing for Energy Applications – 2nd Quarterly Report pfonline.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from pfonline.com Daily Mail and Mail on Sunday newspapers.
The COVID-19 pandemic that emerged in Wuhan city of China in December 2019 has adversely impacted the health and the economy, society, and other significant spheres of the human environment. The pandemic has severely impacted economic activities, especially the industrial production, transportation, tourism, and hoteling industries. The present study analyses the impact of varying severity of lockdowns of economic activities during various phases of the pandemic on the water quality of the Yamuna river on parameters like pH values, biological oxygen demand, chemical oxygen demand, dissolved oxygen, total suspended solids, and electrical conductivity. The study has found a significant improvement in water quality parameters with closing economic activities during lockdowns. The average levels of concentration of these parameters of water quality were quite low during the lockdown period at 7.26 (pH value), 31.32, 136.07, 7.93, 30.33 mg/l, and 1500.24 µS/cm compared to pre lockdown