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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Neodymium_Oxide GDS34 DESCRIPT
DOCUMENTATION_FORMAT: MINERAL
SAMPLE_ID: GDS34
MINERAL_TYPE: Oxide
MINERAL: Neodymium_Oxide
FORMULA: Nd2O3
FORMULA_HTML: Nd2O3
COLLECTION_LOCALITY: REE Standard Reagent
ORIGINAL_DONOR: None
CURRENT_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: USGS Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
Spex Standard 84.3% Nd Lot No. 02831R
Reflectance spectra for reagent-grade Eu2O3, Nd2O3, Sm2O3, and Pr2O3 (Fig. 2) show the intense, narrow absorption bands caused by electronic transitions in trivalent rare earth elements (White, 1967; Dieke and Crosswhite, 1963). The absorption patterns produced by each of these oxides is distinctive for the particular rare earth element involved. The positions of the major bands for Nd2O3 and Sm2O3 are indicated in Table 2. Absorption features that occur near 1.4 and 1.9 µ cannot be unambiguously assigned to water or hydroxyl since some rare earth element oxides, notably Sm2O3 and Pr2O3, have electronic bands in these wavelength regions (Fig. 2). The cause of the 2.35µ bands in two of the rare earth element oxide samples (Fig. 2) also has not been determined. Although White (1967) tentatively attributed similar features to water, the bands could be produced by minor amounts of CO3 or possibly by an undocumented REE-OH vibrational overtone. No carbonate or hydroxyl-bearing phases were detected by X-ray diffraction analysis of the rare earth element oxide samples."
Rowan, Lawrence C., Kingston, Marguerite J., Crowley, James K., Spectral Reflectance of Carbonatites and Related Alkalic Igneous Rocks: Selected Samples from Four North American Localities, Economic Geology, Vol 81, 1986, pp. 857-871.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
40 kV - 30 mA, 6.5-9.5 keV
File: ndoxid34.mdi, *.out (smear mount on quartz plate)
References: JCPDS #21-579, 43-1023, 6-601, 13-85; Huebner's reference
patterns.
Found: Neodymium Hydroxide, Nd(OH)3
Comment: The hydroxide reflections are sharp at 2 theta < 35 degrees,
broad at 2 theta = 35-70 degrees. The alpha1-alpha2 reflections are not
resolved. A weak, broad, unindexed reflection at 1.77 angstroms
corresponds to a weak reflection of high-pressure Nd2O3, but since this
reflection is also present in Huebner's reference pattern of
reagent-grade Nd2O3, it may be a Nd-hydroxide peak that was omitted by
JCPDS.
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: None # XRF, EM(WDS), ICP(Trace), WChem
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
None
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
No visible impurities. G. Swayze.
average grain size= 4 µm
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1a2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
| LIB_SPECTRA_HED: | where | Wave Range | Av_Rs_Pwr | Comment |
|---|---|---|---|---|
| LIB_SPECTRA: | splib04a r 3439 | 0.2-3.0µm | 200 | g.s.= 4 µm |
| LIB_SPECTRA: | splib05a r 4902 | 0.2-3.0µm | 200 | g.s.= |
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