Pierre Curie in the context of Radioactivity

Piezoelectricity (/ˌpiːzoʊ-, ˌpiːtsoʊ-, paɪˌiːzoʊ-/, US: /piˌeɪzoʊ-, piˌeɪtsoʊ-/) is the electric charge that accumulates in certain solid materials—such as crystals, certain ceramics, and biological matter such as bone, DNA, and various proteins—in response to applied mechanical stress.

The piezoelectric effect results from the linear electromechanical interaction between the mechanical and electrical states in crystalline materials with no inversion symmetry. The piezoelectric effect is a reversible process: materials exhibiting the piezoelectric effect also exhibit the reverse piezoelectric effect, the internal generation of a mechanical strain resulting from an applied electric field. For example, lead zirconate titanate crystals will generate measurable piezoelectricity when their static structure is deformed by about 0.1% of the original dimension. Conversely, those same crystals will change about 0.1% of their static dimension when an external electric field is applied. The inverse piezoelectric effect is used in the production of ultrasound waves.

Sorbonne University (French: Sorbonne Université) is a public research university located in Paris, France. The institution's legacy reaches back to the Middle Ages in 1257 when the College of Sorbonne was established by Robert de Sorbon as a constituent college of the University of Paris, one of the first universities in Europe. Its current iteration was formed in 2018 by the merger of Paris-Sorbonne University (Paris IV) and the Université Pierre et Marie Curie (Paris VI).

Sorbonne University is one of the most sought after universities by students and researchers from France, Europe, and the French speaking countries. Most notably, Marie Skłodowska-Curie, who came from Poland in 1891 and joined the Faculty of Sciences of the University of Paris, was also the first woman to become a professor at the Sorbonne. Marie Curie and her husband Pierre Curie are considered the founders of the modern-day Faculty of Science and Engineering of Sorbonne University. As of 2021, its alumni and professors have won 33 Nobel Prizes, six Fields Medals, and one Turing Award.

Radium is a chemical element; it has symbol Ra and atomic number 88. It is the sixth element in group 2 of the periodic table, also known as the alkaline earth metals. Pure radium is silvery-white, but it readily reacts with nitrogen (rather than oxygen) upon exposure to air, forming a black surface layer of radium nitride (Ra₃N₂). All isotopes of radium are radioactive, the most stable isotope being radium-226 with a half-life of 1,600 years. When radium decays, it emits ionizing radiation as a by-product, which can excite fluorescent chemicals and cause radioluminescence. For this property, it was widely used in self-luminous paints following its discovery. Of the radioactive elements that occur in quantity, radium is considered particularly toxic, and it is carcinogenic due to the radioactivity of both it and its immediate decay product radon as well as its tendency to accumulate in the bones.

Radium, in the form of radium chloride, was discovered by Marie and Pierre Curie in 1898 from ore mined at Jáchymov. They extracted the radium compound from uraninite and published the discovery at the French Academy of Sciences five days later. Radium was isolated in its metallic state by Marie Curie and André-Louis Debierne through the electrolysis of radium chloride in 1910, and soon afterwards the metal started being produced on larger scales in Austria, the United States, and Belgium. However, the amount of radium produced globally has always been small in comparison to other elements, and by the 2010s, annual production of radium, mainly via extraction from spent nuclear fuel, was less than 100 grams.

Antoine Henri Becquerel (/ˌbɛkəˈrɛl/ bek-uh-REL; French: [ɑ̃twan ɑ̃ʁi bɛkʁɛl]; 15 December 1852 – 25 August 1908) was a French experimental physicist who shared the 1903 Nobel Prize in Physics with Marie and Pierre Curie for his discovery of radioactivity.

Maria Salomea Skłodowska-Curie (Polish: [ˈmarja salɔˈmɛa skwɔˈdɔfska kʲiˈri] ; née Skłodowska; 7 November 1867 – 4 July 1934), known as Marie Curie (/ˈkjʊəri/ KURE-ee; French: [maʁi kyʁi] ), was a Polish and naturalised-French physicist and chemist who conducted pioneering research on radioactivity.

She was the first woman to win a Nobel Prize, the first person to win a Nobel Prize twice, and the only person to win a Nobel Prize in two scientific fields. Her husband, Pierre Curie, was a co-winner of her first Nobel Prize, making them the first married couple to win the Nobel Prize and launching the Curie family legacy of five Nobel Prizes. She was, in 1906, the first woman to become a professor at the University of Paris.

Polonium is a chemical element; it has symbol Po and atomic number 84. A rare and highly radioactive metal (although sometimes classified as a metalloid) with no stable isotopes, polonium is a chalcogen and chemically similar to selenium and tellurium, though its metallic character resembles that of its horizontal neighbors in the periodic table: thallium, lead, and bismuth. Due to the short half-life of all its isotopes, its natural occurrence is limited to tiny traces of the fleeting polonium-210 (with a half-life of 138 days) in uranium ores, as it is the penultimate daughter of natural uranium-238. Though two longer-lived isotopes exist (polonium-209 with a half-life of 124 years and polonium-208 with a half-life of 2.898 years), they are much more difficult to produce. Today, polonium is usually produced in milligram quantities by the neutron irradiation of bismuth. Due to its intense radioactivity, which results in the radiolysis of chemical bonds and radioactive self-heating, its chemistry has mostly been investigated on the trace scale only.

Polonium was discovered on 18 July 1898 by Marie Skłodowska-Curie and Pierre Curie, when it was extracted from the uranium ore pitchblende and identified solely by its strong radioactivity: it was the first element to be discovered in this way. Polonium was named after Marie Skłodowska-Curie's homeland of Poland, which at the time was partitioned between three countries. Polonium has few applications, and those are related to its radioactivity: heaters in space probes, antistatic devices, sources of neutrons and alpha particles, and poison (e.g., poisoning of Alexander Litvinenko). It is extremely dangerous to humans.

Maria Salomea Skłodowska-Curie (Polish: [ˈmarja salɔˈmɛa skwɔˈdɔfska kʲiˈri] ; née Skłodowska; 7 November 1867 – 4 July 1934), better known as Marie Curie (/ˈkjʊəri/ KURE-ee; French: [maʁi kyʁi] ), was a Polish and naturalised-French physicist and chemist who conducted pioneering research on radioactivity.

She was the first woman to win a Nobel Prize, the first person to win a Nobel Prize twice, and the only person to win a Nobel Prize in two scientific fields. Her husband, Pierre Curie, was a co-winner of her first Nobel Prize, making them the first married couple to win the Nobel Prize and launching the Curie family legacy of five Nobel Prizes. She was, in 1906, the first woman to become a professor at the University of Paris.

The Sorbonne Faculty of Science and Engineering (in French: Faculté des Sciences et Ingénierie de Sorbonne Université) is the second largest of Sorbonne University's three major faculties, in terms of the number of students enrolled. Formed in 1808 as the Faculty of Science of the University of Paris, it became an autonomous university between 1970 and 2017 under the name of the Pierre and Marie Curie University, before becoming a faculty again when it joined the new Sorbonne University. Marie Curie and Pierre Curie are considered the founders of the modern-day Faculty of Science and Engineering of Sorbonne University.

It has been located on the Jussieu Campus since 1956, in the 6th arrondissement of Paris, bordering the historic Latin Quarter to the west. It also has four satellite campuses in various regions of France: Roscoff in Brittany, Banyuls-sur-Mer in the Pyrenees and Villefranche-sur-Mer in the Alpes Maritimes.

In physics and materials science, the Curie temperature (T_C), or Curie point, is the temperature above which certain materials lose their permanent magnetic properties, which can (in most cases) be replaced by induced magnetism. The Curie temperature is named after Pierre Curie, who showed that magnetism is lost at a critical temperature.

The force of magnetism is determined by the magnetic moment, a dipole moment within an atom that originates from the angular momentum and spin of electrons. Materials have different structures of intrinsic magnetic moments that depend on temperature; the Curie temperature is the critical point at which a material's intrinsic magnetic moments change direction.