https://diode.zone/videos/watch/abd68bb0-106c-499a-9e33-04cc7952defb In 1911, while studying the properties of matter at very low temperature, the Dutch physicist Heike Kamerlingh Onnes and his team discovered that the electrical resistance of mercury goes to zero below 4.2 K (-269°C). The majority of chemical elements become superconducting at sufficiently low temperature. Below a certain “critical” temperature, materials undergo transition into the superconducting state, characterized by two basic properties: firstly, they offer no resistance to the passage of electrical current. When resistance falls to zero, a current can circulate inside the material without any dissipation of energy. Secondly, provided they are sufficiently weak, external magnetic fields will not penetrate the superconductor, but remain at its surface. This field expulsion phenomenon is known as the Meissner effect, after the physicist who first observed it in 1933. Superconductivity continued to spring surprises for decades afterwards. Superconductivity can also help with another major pitfall of renewable energy: its fickle nature. Superconductors can help tackle such "intermittency" problems via Meissner effect. If a magnet is brought near a superconductor, it experiences a force field that allows it to defy gravity and levitate. Known as "flux expulsion", this is more than just a party trick, however; it can be used to create frictionless bearings for gigantic energy-storing flywheels. The electricity produced by, say, wind turbines is used to spin up these flywheels, which then spin rapidly at a virtually constant rate on their frictionless bearings. Their huge rotational energy can then be turned back into electricity whenever it is needed even if the wind turbines that supplied them are no longer turning. In our study we attended Bi2212 phase, it belongs to high temperature superconductors, ceramic type doping with nickel oxide (NiO) in different amounts 1% based on oxides: Bi2O3, SrCO3, CaCO3 and CuO, the samples prepared using X-ray diffraction method, scanning electron microscope and ultraviolet ray for structural and optical study. Refinement of X-ray diffraction (XRD) was carried out by material analysis using diffraction (MAUD) program to obtain the structural parameters such as lattice parameters, site occupancy of different atoms and orthorhombicity value for all samples. Results show that NiO doping does not change the structure. The scanning electron microscopy (SEM) images of the samples show better grain connections by NiO doping. The energy gap is so small, from the order of 10-2 or 10-3, that it cannot appear in the spectrometer. The UV-Vis spectra show the sample to be conducting at room temperature with no band gap present at 300K. presenter: Belakroum Karima Université of Kasdi Merbah-Ouargla, Algeria Tue, 20 Oct 2026 14:08:10 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://diode.zone https://diode.zone/lazy-static/avatars/61b689b7-84d5-43c7-9fa8-e63a7fd1d952.png https://diode.zone/videos/watch/abd68bb0-106c-499a-9e33-04cc7952defb All rights reserved, unless otherwise specified in the terms specified at https://diode.zone/about and potential licenses granted by each content's rightholder.