Charge density fluctuations are observed in all families of high-critical temperature (Tc) superconducting cuprates. Although constantly found in the underdoped region of the phase diagram at relatively low temperatures, ...
Researchers from the Moscow Institute of Physics and Technology have created a device that acts like a synapse in the living brain, storing information and gradually forgetting it when not accessed for a long time. Known ...
General Physics
Aug 29, 2019
0
543
Ionic conduction involves the movement of ions from one location to another inside a material. The ions travel through point defects, which are irregularities in the otherwise consistent arrangement of atoms known as the ...
Materials Science
May 02, 2019
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76
Bill Fairbank is looking for... nothing.
General Physics
Apr 29, 2019
0
466
When it comes to understanding future climate, the south Asian summer monsoon offers a paradox. Most climate models predict that as human-caused global warming increases, monsoon rain and wind will become more intense—but ...
Earth Sciences
Apr 16, 2019
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69
The electrical energy from batteries powers not only the ignition system that turns the engine and moves electric vehicles but also powers almost every sensing feature of today's automobiles. Electricity turns on the car ...
Engineering
Apr 01, 2019
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6
Companies are keen to use miniature chemical reactors to make pharmaceuticals and fine chemicals, but are discouraged by their tendency to clog up. Researchers at KU Leuven, Belgium, have now devised an elegant way of using ...
Materials Science
Dec 19, 2018
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5
A team of researchers at Southeast University in China has found a way to make metal-free perovskites in a useable form. In their paper published in the journal Science, the group describes their technique and how well it ...
Researchers have carried out a chemical abundance analysis of three chemically peculiar stars, HD 51959, HD 88035 and HD 121447. The research, based on spectroscopic data acquired by the Fiber-fed Extended Range Optical Spectrograph ...
The Kuroshio ocean current, originating in the Philippine Sea east of the Luzon Strait, enters the East China Sea (ECS) northeast of Taiwan Island, flowing along the outer edge of the ECS shelf, and turns eastward to the ...
Earth Sciences
Jun 06, 2017
0
7
Barium ( /ˈbɛəriəm/ bair-ee-əm) is a chemical element with the symbol Ba and atomic number 56. It is the fifth element in Group 2, a soft silvery metallic alkaline earth metal. Barium is never found in nature in its pure form due to its reactivity with air. Its oxide is historically known as baryta but it reacts with water and carbon dioxide and is not found as a mineral. The most common naturally occurring minerals are the very insoluble barium sulfate, BaSO4 (barite), and barium carbonate, BaCO3 (witherite). Barium's name originates from Greek barys (βαρύς), meaning "heavy", describing the high density of some common barium-containing ores.
Barium has few industrial applications, but the metal has been historically used to scavenge air in vacuum tubes. Barium compounds impart a green color to flames and have been used in fireworks. Barium sulfate is used for its density, insolubility, and X-ray opacity. It is used as an insoluble heavy mud-like paste when drilling oil wells, and in purer form, as an X-ray radiocontrast agent for imaging the human gastrointestinal tract. Soluble barium compounds are poisonous due to release of the soluble barium ion, and have been used as rodenticides. New uses for barium continue to be sought. It is a component of some "high temperature" YBCO superconductors, and electroceramics.
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