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The third part of the GD 3 concept. One objective of a good design review is to examine the results of validation testing, making all product weaknesses visible. This examination involves applying another GD 3 concept, design review based on test results (DRBTR). When applying DRBTR, we must, wherever possible, observe the product test before ...
Lanthanum(III) nitrate is any inorganic compound with the chemical formula La(NO 3) 3 ·xH 2 O. It is used in the extraction and purification of lanthanum from its ores. [5] The compound decomposes at 499°C to lanthanum oxide, nitric oxide and oxygen. [3]
Due to the large size of the La 3+ ion, La 2 O 3 adopts a hexagonal 7-coordinate structure that changes to the 6-coordinate structure of scandium oxide (Sc 2 O 3) and yttrium oxide (Y 2 O 3) at high temperature. When it reacts with water, lanthanum hydroxide is formed: [37] a lot of heat is evolved in the reaction and a hissing sound is heard.
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Lanthanum oxide is used in optical materials; often the optical glasses are doped with La 2 O 3 to improve the glass' refractive index, chemical durability, and mechanical strength. [8] 3 B 2 O 3 + La 2 O 3 → 2 La(BO 2) 3 [clarification needed] The addition of the La 2 O 3 to the glass melt leads to a higher glass transition temperature from ...
Lanthanum hydroxide does not react much with alkaline substances, however is slightly soluble in acidic solution. [2] In temperatures above 330 °C it decomposes into lanthanum oxide hydroxide (LaOOH), which upon further heating decomposes into lanthanum oxide (La 2 O 3): [4]
Lanthanum(III) iodate can be obtained by reacting a La 3+ salt with potassium iodate or ammonium iodate and precipitating it: [1] La 3+ + 3 IO 3 − → La(IO 3 ) 3 ↓ Properties
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