Gadolinium is a chemical element that has the symbol Gd and atomic number 64.

Gadolinium is a silvery-white, malleable and ductile rare-earth metal with a metallic lustre. It crystallizes in hexagonal, close-packed alpha form at room temperature, but, when heated to 1508 K or more, it transforms into its beta form, which has a body-centered cubic structure.

Unlike other rare earth elements, gadolinium is relatively stable in dry air. However, it tarnishes quickly in moist air, forming a loosely-adhering oxide which spalls off, exposing more surface to oxidation. Gadolinium reacts slowly with water, and is soluble in dilute acids.

Gadolinium-157 has the highest thermal neutron capture cross-section of any known nuclide with the exception of xenon-135, 49,000 barns, but it also has a fast burn-out rate, limiting its usefulness as a nuclear control rod material.[2]

Gadolinium is strongly paramagnetic at room temperature, and exhibits ferromagnetic properties below room temperature.

Gadolinium demonstrates a magnetocaloric effect whereby its temperature increases when it enters a magnetic field and decreases when it leaves the magnetic field. The effect is considerably stronger for the gadolinium alloy Gd5(Si2Ge2) .

Source: Wikipedia

The term "gadolinium" was found in the following pages:

US FDA Announces Gadolinium-Based MRI Contrast Agent Warning | EVISA's News
Gadolinium found in the brain of a patient two years after having received a Gd-based contrast agent for medical imaging | EVISA's News
Link database: Gadolinium Gd of MRI contrast agent
Link database: DrugBank: Gadopentetate dimeglumine
Link database: Hazardous Substances Data Bank: Gadolinium compounds
Link database: Chemical Fact Sheet: Curium
Link database: Mineral Information Institute: Rare Earth Elements
Link database: DrugBank: Gadodiamide
Link database: Gadolinium based MRI contrast agents
Link database: RSC Periodic Table: Gadolinium
Publication on the separation of Gd-based contrast agents awarded | EVISA's News
Gadolinium speciation analysis in search for the cause of nephrogenic systemic fibrosis (NSF) | EVISA's News
Material database: United States Pharmacopeial Convention (USP) - Gadodiamide
Identification and quantification of potential metabolites of Gd-based contrast agents | EVISA's News
Material database: National Analysis Center for Iron & Steel (NACIS) - NCS ZC73014 - Trace Elements in Tea
Material database: IRMM - Institute for Reference Materials and Measurements - BCR-668 - Mussel tissue
South Korea: 13 gadolinium contrast agents banned until year-end | EVISA's News
Link database: DART: Gadolinium toxicity
Gadolinium-based contrast agents induce gadolinium deposits in cerebral vessel walls | EVISA's News
Link database: Gadolinium Toxicity