lanthanides


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lan·tha·nides

(lan'thă-nīdz),
Those elements with atomic numbers 57-71 that closely resemble one another chemically and were formerly difficult to separate from one another. they vary in the electrons in the 4f orbital.
Synonym(s): rare earth elements
[lanthanum, first element of the series]

lan·tha·nides

(lan'thă-nīdz)
Those elements with atomic numbers 57-71 that closely resemble one another chemically and were formerly difficult to differentiate.
[lanthanum, first element of the series]
References in periodicals archive ?
and Calagari, A.A.: 2018b, Lanthanide tetrad effect in limestone: A tool to environment analysis of the Ruteh Formation, NW Iran.
For the extraction of lanthanides from aqueous systems, different prospective sorbents are studied by several research groups [20-24].
Determination of lanthanides by any physio-chemical technique is a always a difficult task due to the similarity in their chemical and physical behavior.
Based on the above investigations, nitric acid pre-leach were optimized to maximize rare earth dissolution and minimize calcium and phosphate dissolution, the lanthanides were selectively leached from phosphate rock with a little uranium and [P.sub.2][O.sub.5] by conducting 12.5 g of the phosphate rock (0.5-0.6 mm) with 50 mL of 0.5 M nitric acid in thermo- static vessel and 400 rpm,, in two extraction stages each within 5 min.
For example, dual-modal (UC/DC) luminescence has been successfully realized through lanthanide (Ln) ions doped NaGdF4 core/shell nanocrystals by Chen's group [11].
The mechanism for upconversion of lanthanide ([Ln.sup.3+])-doped nanocrystals is a probability-based event.
As shown in Figure 1, the absorption dispersions for MDC, composed of different combinations of positive association lanthanides; Nd and Sm, with negative association elements; and Ho and Er are presented.
For the nuclei included in our study, all chains of lanthanides begins as vibrational with R(4/2) near 2.0 and move towards rotational (R(4/2) [right arrow] 3.33) as neutron number increases.
The 17 'rare earths', the collective name for the 15 lanthanides, scandium and yttrium are essential and very, very politically significant.
Rare earths, considered as containing a group of elements comprising scandium, yttrium and 15 other elements (lanthanides), are now widely used in high technology industries.
It also incorporates a group of rare-earth elements known as lanthanides. The repackaged DNA is protected from damage as it travels into the cells and the lanthanides allow visualization of the delivery into cells.