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Neodymium(III) oxide or neodymium sesquioxide is the chemical compound composed of neodymium and oxygen with the formula Nd 2 O 3. It forms very light grayish-blue hexagonal crystals. [ 1 ] The rare-earth mixture didymium , previously believed to be an element , partially consists of neodymium(III) oxide.
Refractometry is the analytical method of measuring substances' refractive index (one of their fundamental physical properties) in order to, for instance, assess their composition or purity. A refractometer is the instrument used to measure refractive index ("RI"). Although refractometers are best known for measuring liquids, they are also used ...
Refractometry [ edit ] Standard refractometers measure the extent of light refraction (as part of a refractive index) of transparent substances in either a liquid this is then used in order to identify a liquid sample, analyze the sample's purity, and determine the amount or concentration of dissolved substances within the sample.
North Dakota 20 in Devils Lake, August 2013. Starting at US 52 in downtown Jamestown, ND 20 follows 4th Street NE until 5th Avenue NE, then curves onto 13th Street NE until 12th Avenue NE where ND 20 follows 12th Avenue out of Jamestown. 21.3 miles away from the intersection, ND 20 turns right onto ND 9 and continues for about six miles before turning off in Courtenay and running for 16.8 ...
Neodymium compounds are compounds formed by the lanthanide metal neodymium (Nd). In these compounds, neodymium generally exhibits the +3 oxidation state, such as NdCl 3, Nd 2 (SO 4) 3 and Nd(CH 3 COO) 3. Compounds with neodymium in the +2 oxidation state are also known, such as NdCl 2 and NdI 2. Some neodymium compounds have colors that vary ...
The most general form of this equation is = + + +, where n is the refractive index, λ is the wavelength, and A, B, C, etc., are coefficients that can be determined for a material by fitting the equation to measured refractive indices at known wavelengths.
Neodymium nitrate is an inorganic compound with the formula Nd(NO 3) 3 ·(x(H 2 O). It is typically encountered as the hexahydrate, Nd(NO 3) 3 ·6H 2 O, which is more accurately formulated as [Nd(NO 3) 3 (H 2 O) 4].2H 2 O to reflect the crystal structure. [1] It decomposes to NdONO 3 at elevated temperature. [2]
The refractive index increment,, often expressed as mL/g, [2] is the change in a solutions' refractive index vs concentration. A differential refractometer facilitates determining this term. [3]