sciencedirect: Control of experimental conditions in reaction flash-sintering of complex stoichiometry ceramics

 

Ceramics International

Volume 46, Issue 18, Part B, 15 December 2020, Pages 29413-29420

Control of experimental conditions in reaction flash-sintering of complex stoichiometry ceramics

Eva Gil-González a, Antonio Perejón b c, Pedro E. Sánchez-Jiménez b, Daniel Román-González b, Luis A. Pérez-Maqueda b

a
    John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, United States

b
    Instituto de Ciencia de Materiales de Sevilla, Consejo Superior de Investigaciones Científicas−Universidad de Sevilla, Calle Américo Vespucio 49, Sevilla, 41092, Spain

c
    Departamento de Química Inorgánica, Facultad de Química, Universidad de Sevilla, Sevilla, Spain

Received 20 January 2020, Revised 7 May 2020, Accepted 8 May 2020, Available online 23 May 2020, Version of Record 24 October 2020.

 

 

Abstract

The inherent potential of reaction flash-sintering for the preparation of complex oxides is evidenced by the one-step synthesis and densification of a ceramic of complex stoichiometry. The system Bi_0.93La_0.07FeO₃, a multiferroic ceramic with promising technological applications, has been chosen. This system presents three different metals in its composition and it is extremely challenging to prepare by conventional procedures. Non-stoichiometric materials with unwilling secondary phases are usually obtained by conventional methods, due to the high volatility of bismuth oxide at the temperatures required for inducing the solid-solid reactions. Here, it is demonstrated that a careful control of the experimental flash conditions (applied electric field and selected current density limit) is required to obtain a high quality ceramic. Small deviations from the optimum conditions result in either non-stoichometric or poorly densified samples.

 

 https://www.sciencedirect.com/science/article/pii/S0272884220313791

science.org: International scientists rethink U.S. conference attendance

 Careers/Scientific Community

International scientists rethink U.S. conference attendance

Opposition to Trump administration and fears of customs run-ins are shifting travel plans

31 Mar 20255:10 PM ET By Katie Langin

 

 https://www.science.org/content/article/international-scientists-rethink-us-conference-attendance

Harmful Advice on Destroying International Scientometrics

 
Russians are trying to bypass international scientometrics in their usual propaganda method. In the Tatarstan Business Newspaper published in Russian, an article by Sergey Anureyev appeared, who is more of a profiteer than a scientist, who was engaged in business and investment in Russia, and is also a doctor of economics at the Financial University under the Government of the Russian Federation.
Despite the fact that he himself is a businessman and dealer, he accuses Scopus and Web of Science of speculation and greed. And reproachfully writes that they are private organizations. I see in this a clear contradiction and conflict of meanings.

Here is the advice he writes to Donald Trump (Google translation from Russian):


The "bomb" under scientometrics and ratings is now in the first and second positions of SJR. If in the almost thirty-year ranking the USA is still ahead of China, then in 2020 the latter came out on top in the annual ranking, and in 2023 it has already broken away from the USA by a third. What if Donald Trump with his "Make America Great Again" pays attention to this rating and decides to correct it? Correct it with his characteristic methods of the "common sense revolution": either by abolishing this rating or by revealing fraud in it. Trump has serious geopolitical "inconsistencies" with Britain and the European Union, and both private scientometrics companies are headquartered in London (one is partly in Holland). The USA has even more complicated political and trade relations with China, and here China has overtaken the USA in scientometrics. Trading stocks in New York makes these two scientometrics firms easy targets for Trump, and there's plenty to dig into even with a cursory glance at their balance sheets and stock prices.