Or_Mi
earthlingChina curbs exports of five metals. What are they used for?
China has announced sweeping export restrictions on five metals used in the defence, clean energy and other industries.
Here is what you need to know about them:
@evelynefoerster Es ist sowieso wahnsinnig, was die früher schon alles so präzis berechnen und herstellen konnten, da stauen ich immer!😲 Sehr gut möglich, dass es wegen quasi kleinen Dingen "harzte". - In Grenchen ist übrigens einer, der ein #Tellurium nachbauen wollte (ich weiss nicht, ob er mittlerweile damit fertig ist), Marc Maradan. Ich kenne ihn eigentlich, habe ihn aber schon Jahrzehnte nicht mehr gesehen. Guck hier auf seiner Webseite: https://www.analog-astronomical-device.ch/tellurium #Antikythera
ThinkK2 hat heute unser #Lego #Tellurium rechtzeitig zur #Sonnenfinsternis in #NORAM fertiggestellt. Echt cool so eine SoFi!!!
Matt WillemsenCosmic Alchemy: Webb’s First Glimpse Into Heavy Element Creation
Using various telescopes, researchers observed a bright gamma-ray burst, revealing a neutron star merger and detecting the rare element tellurium. These findings, resulting from kilonova explosions, offer deeper insights into element creation, promising more advanced discoveries in the future.
https://scitechdaily.com/cosmic-alchemy-webbs-first-glimpse-into-heavy-element-creation/ #JWST #Webb #HeavyElement #tellurium #neutron #star #nucleogenesis #astronomy #kilonova
Using various telescopes, researchers observed a bright gamma-ray burst, revealing a neutron star merger and detecting the rare element tellurium. These findings, resulting from kilonova explosions, offer deeper insights into element creation, promising more advanced discoveries in the future.
https://scitechdaily.com/cosmic-alchemy-webbs-first-glimpse-into-heavy-element-creation/ #JWST #Webb #HeavyElement #tellurium #neutron #star #nucleogenesis #astronomy #kilonova
Cosmic Alchemy: Webb’s First Glimpse Into Heavy Element Creation
Webb’s study of the second-brightest gamma-ray burst ever seen reveals tellurium. Under what conditions many chemical elements are created in the universe has long been shrouded in mystery. This includes elements that are highly valuable, or even vital to life as we know it. Astronomers are now
AkaSci 🛰️Tellurium (Te), atomic number 52, is a brittle, mildly toxic, rare, silver-white metalloid. Te is chemically related to selenium and sulfur, all three of which are chalcogens.
Major appls include thin-film solar cells (40%), thermoelectrics / thermocouples (30%), metallurgy (15%) and rubber (5%).
CdTe solar cells are the second-most common photovoltaic technology after crystalline silicon, although their efficiency is higher.
https://www.energy.gov/eere/solar/cadmium-telluride
#JWST #Tellurium
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The NASA press release and tweets contain the factoid that tellurium is rarer than platinum on earth. It should be noted that the amount of Te on earth is low because earth lost most of it during its early years due to the formation and evaporation of volatile hydrides of tellurium. Hydrogen telluride (H2Te) is an unstable analogue of the other chalcogen hydrides H2O, H2S and H2Se.
Tellurium is much more abundant in the rest of the cosmos.
Is this the first detection of tellurium (Te) in interstellar space? Of course not. Te and other heavy elements have been detected before by earth and space based telescopes.
E.g. Hubble detected Te in 2012 in 3 metal-rich stars.
https://arxiv.org/abs/1202.2378
A team of researchers detected tellurium and iodine in two planetary nebulae in 2018, using the Gran Telescopio Canarias, and the Harlan J. Smith Telescope, at the McDonald Observatory in Texas.
https://www.iac.es/en/outreach/news/tellurium-detected-one-its-places-origin
#JWST #Tellurium
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Detection of the Second r-process Peak Element Tellurium in Metal-Poor Stars
Using near-ultraviolet spectra obtained with the Space Telescope Imaging Spectrograph onboard the Hubble Space Telescope, we detect neutral tellurium in three metal-poor stars enriched by products of r-process nucleosynthesis, BD+17 3248, HD 108317, and HD 128279. Tellurium (Te, Z=52) is found at the second r-process peak (A=130) associated with the N=82 neutron shell closure, and it has not been detected previously in Galactic halo stars. The derived tellurium abundances match the scaled solar system r-process distribution within the uncertainties, confirming the predicted second peak r-process residuals. These results suggest that tellurium is predominantly produced in the main component of the r-process, along with the rare earth elements.
It is well understood that massive stars synthesize elements up to Iron (Fe) through nuclear fusion. Most of the elements heavier than Fe are forged in highly energetic events such as supernovae and neutron star mergers in a set of nuclear reactions known as the r-process. A slower s-process is also known to generate some heavy elements.
The graphic below shows the cosmogenic origin of elements in the Periodic Table.
https://en.wikipedia.org/wiki/R-process
https://www.nhm.uio.no/english/about/organization/research-collections/people/rtronnes/1/epmd/a-n-s-pt/sci19-johnson-periodic-table-nucleosynthesis.pdf
#JWST #Tellurium
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The researchers also did some detective work to figure out the origin of these neutron stars.
It is theorized that they began as two normal massive stars, part of a binary system in a nearby spiral galaxy. One of the stars exploded as a supernova and became a neutron star; both stars were ejected from the galaxy. Later, the other star exploded as well. Several million years later and after traveling 120K light-years, the neutron stars merged.
https://www.nasa.gov/missions/webb/nasas-webb-makes-first-detection-of-heavy-element-from-star-merger/
#JWST #Tellurium
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Researchers using the JWST recently detected the heavy element tellurium in the ejecta of two colliding neutron stars whose cataclysmic merger was detected in March this year by several observatories.
Neutron star mergers create gamma-ray bursts, gravitational waves and many elements with large atomic weights.
In the spectral data below, a distinct peak can be seen in the region of the spectrum associated with tellurium.
https://www.nasa.gov/missions/webb/nasas-webb-makes-first-detection-of-heavy-element-from-star-merger/
https://webbtelescope.org/contents/media/images/2023/134/01HAWFJMYS933DDC7NJJE2VFRH
#JWST #Tellurium
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