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Title: Thermodynamics of copper-manganese and copper-iron spinel solid solutions

Authors:
 [1]; ORCiD logo [2]
  1. Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California Davis, Davis California, Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge Massachusetts
  2. Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California Davis, Davis California
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1373829
Grant/Contract Number:
FG02-03ER6053
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Journal of the American Ceramic Society
Additional Journal Information:
Journal Volume: 100; Journal Issue: 8; Related Information: CHORUS Timestamp: 2017-08-03 16:31:07; Journal ID: ISSN 0002-7820
Publisher:
Wiley-Blackwell
Country of Publication:
United States
Language:
English

Citation Formats

Sahu, Sulata K., and Navrotsky, Alexandra. Thermodynamics of copper-manganese and copper-iron spinel solid solutions. United States: N. p., 2017. Web. doi:10.1111/jace.14813.
Sahu, Sulata K., & Navrotsky, Alexandra. Thermodynamics of copper-manganese and copper-iron spinel solid solutions. United States. doi:10.1111/jace.14813.
Sahu, Sulata K., and Navrotsky, Alexandra. Sat . "Thermodynamics of copper-manganese and copper-iron spinel solid solutions". United States. doi:10.1111/jace.14813.
@article{osti_1373829,
title = {Thermodynamics of copper-manganese and copper-iron spinel solid solutions},
author = {Sahu, Sulata K. and Navrotsky, Alexandra},
abstractNote = {},
doi = {10.1111/jace.14813},
journal = {Journal of the American Ceramic Society},
number = 8,
volume = 100,
place = {United States},
year = {Sat Apr 22 00:00:00 EDT 2017},
month = {Sat Apr 22 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1111/jace.14813

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  • Single phase cubic spinel compounds Li {sub x}Mn{sub 1+x}Fe{sub 2-2x}O{sub 4} (x = 0, ..., 1) were obtained by thermal decomposition of freeze-dried formate solutions of appropriate composition. The samples were characterized by X-ray powder diffraction and Rietveld refinement, XANES, {sup 57}Fe Moessbauer spectroscopy and magnetization measurements. The combination of these methods provides useful conclusions concerning the structure, cation distribution and properties of the spinel solid solutions. The Li {sub x}Mn{sub 1+x}Fe{sub 2-2x}O{sub 4} samples contain Mn(II) and Mn(III) or Mn(III) and Mn(IV) for x < 0.5 or x > 0.5, respectively. With the increase of x the portion ofmore » Li ions occupying tetrahedral sites increases and becomes 100% at about x = 4/7. In spite of the preferred occupation of octahedral sites by manganese(III), the experimental results can only be explained by a partial occupation also of tetrahedral sites by Mn(III). An increase of M {sub S} with the increase of x (expected for a preferred substitution of magnetic ions in tetrahedral sites by non-magnetic Li ions) is not observed. It should be prevented by the decreasing cooperative coupling effects due to the reduction of the iron content.« less
  • A scheme for the rapid quantitative analysis of uraniumore acid leach solutions or solutions of similar composition is described. As, Cd, Co, Cu, Ni, and Zn are determined polarographically, Al, Fe, and Mn colorimetrically, and Ca and Mg by titration with EDTA. The scheme for the sepa- ration of Al, Cd, Ca, Co, Mg and Zn from Fe and Mn and from each other by anion-exchange chromatography and solvent extraction of oxinates is also described. (auth)
  • There exists considerable current interest in the study of catalysts that demonstrate high selectivities for C/sub 2/-C/sub 4/ hydrocarbons from carbon monoxide hydrogenation. In this respect iron manganese matrix catalysts have been well studied by a number of authors since Koelbel initially disclosed that these catalysts could give high yields of C/sub 2/-C/sub 4/ hydrocarbons with a corresponding very low methane selectivity. The mechanism by which the manganese component causes these product distributions is at present poorly understood. Recently Jensen and Massoth have proposed that small iron particles are supported on and electronically promoted by MnO. Although these oxide solidmore » solutions have been identified there have been no reported studies that have investigated the effect of these catalyst components on catalyst selectivity. Oxide solid solutions are known to be important as catalysts of a number of reactions involving carbon monoxide. In this note the authors present their initial findings for the effect of iron manganese oxide solid solutions on catalyst selectivity in carbon monoxide hydrogenation. 24 references.« less
  • The authors selected 55 cultivated organic soils from nine areas in eastern Canada that represented important properties of the investigated population, in order to evolve useful tests for plant-available Cu, Fe, Mn, and Zn in the soils. As a first step, the level and distribution of the soil Cu into H/sub 2/O-sol, Ca-exchangeable, free-oxide-associated, weakly complexed, strongly complexed, strongly complexed, carbonate, and sulfide forms were determined by sequential extractions, and the influence of soil properties on the level and distribution of Cu was ascertained. The data revealed that the level of total Cu in the soils, ranging from 8.3 tomore » 537.5 ..mu..g x g/sup -1/ was independent of soil pH; percentage of ash; pyrophosphate index; bulk density; cation exchange capacity; and level of Fe, Mn, and Zn. The Fe (0.15 to 3.57%) and Mn (32.5 to 916.8 ..mu..g x g/sup -1/) levels reflected the degree of decomposition and mineralization (percentage of ash: 6.0 to 53.7) of the organic soils, but Cu was mainly of external origin and thus increased with length of cultivation, due to the general practice of periodic applications of Cu.« less