from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Niobium. No longer in scientific use.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A former name of niobium/
from the GNU version of the Collaborative International Dictionary of English
- n. A rare element of the vanadium group, first found in a variety of the mineral columbite occurring in Connecticut, probably at Haddam. Atomic weight 94.2. Symbol Cb or Nb. Now more commonly called niobium.
from The Century Dictionary and Cyclopedia
- n. Same as niobium.
- n. In chem., a supposed new element announced in 1879 by J. L. Smith as present in the mineral samarskite: its existence has not been confirmed. Distinct from the previously known element columbium or niobium.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a former name for niobium
These minerals are the principal sources of columbium (commonly called niobium), tantalum and molybdenum metals.
Possible substitutes for molybdenum as a strengthening alloy in steel include vanadium, chromium, columbium, and boron.
In the presence of columbium the solution first becomes blue and then changes to a turbid brownish-black
Thus C stands for carbon, Cl for chlorine, Cd for cadmium, Ce for cerium, Cb for columbium.
The company said that the surcharge is necessary to offset the rapid and unpredictable changes in columbium prices, which is used in the manufacture of some of its specialty alloy products.
The columbium element of the surcharge will be based on the monthly mean value for Ferro Columbium Niobium found on metalprices.com, using a base price of $8.00/lb.
There are five metals, arsenic, molybdena, chrome, tungsten, and columbium, which are susceptible of combining with a sufficient quantity of oxygen to be converted into acids.
The nozzle material is made of columbium and heats up during the test causing the color change.
Materials classified as carbon steel might also contain small amounts of other elements, such as chromium, nickel, molybdenum, copper, vanadium, niobium (columbium), phosphorous, and sulfur.
His claim was refuted when another English chemist named William Hyde Wollaston claimed Hatchett's columbium was just another form of the element tantalum.
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