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Mineralogical and chemical characterization of iron-, manganese-, and copper-containing synthetic hydroxyapatitesThe National Aeronautics and Space Administration's (NASA) Advanced Life Support (ALS) Program is evaluating the use of Fe-, Mn-, and Cu-containing synthetic hydroxyapatite (SHA) as a slow release fertilizer for crops that might be grown on the International Space Station or at Lunar and Martian outposts. Separate Fe-, Mn-, and Cu-containing SHA materials along with a transition-metal free SHA (pure-SHA) were synthesized using a precipitation method. Chemical and mineralogical analyses determined if and how Fe, Mn, and Cu were incorporated into the SHA structure. X-ray diffraction (XRD), Rietveld refinement, and transmission electron microscopy (TEM) confirmed that SHA materials with the apatite structure were produced. Chemical analyses indicated that the metal containing SHA materials were deficient in Ca relative to pure-SHA. The shift in the infrared PO4-mu 3 vibrations, smaller unit cell parameters, smaller particle size, and greater structural strain for Fe-, Mn-, and Cu-containing SHA compared with pure-SHA suggested that Fe, Mn, and Cu were incorporated into SHA structure. Rietveld analyses revealed that Fe, Mn, and Cu substituted into the Ca2 site of SHA. An Fe-rich phase was detected by TEM analyses and backscattered electron microscopy in the Fe-containing SHA material with the greatest Fe content. The substitution of metals into SHA suggests that metal-SHA materials are potential slow-release sources of micronutrients for plant uptake in addition to Ca and P.
Document ID
20040087414
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Sutter, B.
(College Station TX 77843, United States)
Ming, D. W.
Clearfield, A.
Hossner, L. R.
Date Acquired
August 21, 2013
Publication Date
November 1, 2003
Publication Information
Publication: Soil Science Society of America journal. Soil Science Society of America
Volume: 67
Issue: 6
ISSN: 0361-5995
Subject Category
Man/System Technology And Life Support
Funding Number(s)
CONTRACT_GRANT: NGT5-1229
Distribution Limits
Public
Copyright
Other
Keywords
NASA Center JSC
NASA Discipline Life Support Systems
NASA Program Advanced Human Support Technology

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