Unit-cell dimensions of pure and trace metal-associated goethites

Details Unit-cell dimensions of pure and trace metal-associated goethites Unit-cell dimensions of pure and trace metal-associated goethites

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54..363g&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 54, Issue 2, pp.363-371

Physics

6

Scientific paper

Synthetic goethite prepared under highly alkaline conditions incorporates Co 3+ , Ni 2+ , Cu 2+ , Zn 2+ , Cd 2+ , and Pb 4+ into its structure by isomorphous substitution. Systematic changes of the unit-cell b -dimension with increasing substitution can be related to the ionic radii of incorporated metals. The octahedra of the goethite structure become distorted along the crystallographic a -axis by an incorporation of Cu 2+ (Jahn-Teller-effect), Zn 2+ , and Cd 2+ . For Zn- and Cd-goethite, the distortion along a can be explained by a smaller ionic size which both foreign metals exhibit in tetrahedral coordination. Thorium is postulated to be incorporated by non-structural incorporation while U is not incorporated. Non-substituted as well as Co-, Ni-, Cd-, and Pb-goethites can have a slightly variable a -dimension depending on the temperature during crystal formation. A higher a -dimension is believed to be the result of structural defects and does not indicate a separate mineral phase.

Affiliated with

Also associated with

No associations

Rating

Unit-cell dimensions of pure and trace metal-associated goethites does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Unit-cell dimensions of pure and trace metal-associated goethites, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Unit-cell dimensions of pure and trace metal-associated goethites will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1842014