DOI: 10.1098/rsta.1966.0025. On the praseodymium + oxygen system

10.1098/rsta.1966.0025

Crossref journal-article

The Royal Society

Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences (175)

Abstract

An isobaric survey of the system praseodymium oxide + oxygen has been made at oxygen pressures between 0 and 1 atm and in the temperature range 200 to 1150 °C. The derived isobaric sections enable a three-dimensional phase diagram (pressure, temperature, composition) to be constructed with considerable certainty and detail for the composition range PrOj.gg to PrOj.g*. Reasonable extensions to cover the complete range between the sesquioxide and dioxide are proposed, and a projection of the diagram on to the temperature-composition plane is presented. At lower temperatures several discrete, ordered phases of narrow homogeneity range exist. These constitute an homologous series P r„02n_2, with n = 4, 7, 9 ,1 0 ,1 1 ,1 2 , oo. At higher temperatures two wide-range solid solutions obtain: <r, a body-centred cubic phase with a maximum composition range ca. PrOj.gQ to PrOj.yo; and a, a face-centred cubic phase of composition P r O ^ to P r 0 2. The fields of stability of the various phases are defined and the ambient conditions at many invariant axes (peritectoid and eutectoid) enumerated. Miscibility gaps with upper consolute points are exceptional; order-disorder peritectoid transformations are common. Hysteresis in phase transformations is confirmed, and the results further demonstrate the existence of metastable states in phase reactions involving an increase in structural order. The appearance of these pseudo-phases and the nature of non-stoichiometry is explained in terms of a plausible model invoking microdomain texture in defect solids. This model is believed to be appropriate for other non-stoichiometric systems also. Earlier experimental data on the system are examined, and found to be consistent with the present results.

Authors 0

None

References 30 Referenced 151

{'key': 'p_1', 'first-page': '69', 'article-title': 'Proc. Roy', 'volume': '185', 'author': 'Anderson J. S.', 'year': '1945', 'journal-title': 'Soc. A'} / Soc. A / Proc. Roy by Anderson J. S. (1945)
10.1021/ba-1964-0039.ch001
Anderson J. S. 1964 Proc. Chem. Soc. p. 166.
Anderson J. S. & Sterns M. 1959
Andersson S. i 960 J.Inorg. Nucl. Chem. 11 272.
ActaChem. Scand. 14 1161.
10.3891/acta.chem.scand.11-1641
{'key': 'p_8', 'first-page': '2077', 'volume': '32', 'author': 'Ariya S. M.', 'year': '1962', 'journal-title': 'J. Gen. Chem. Moscow'} / J. Gen. Chem. Moscow by Ariya S. M. (1962)
10.1021/ja01471a001
10.1016/0022-1902(55)80067-X
Bevan D .J . M . Barker W. W . Martin R. L. & Parks T. C. 1965 earth research vol. 3 (ed. L. Eyring). New York: Gordon and Breach.
Bevan D. J. M. & Kordis J. 1964
10.1088/0959-5309/52/1/315
10.1002/ange.19570691316
Brauer G. & Gingerich K. A. i 960 J. Inorg. Nucl. Chem. 16 87. (10.1016/0022-1902(60)80091-7)
Brauer G. Gingerich K. A. & Holtschmidt U . i 960 J. Inorg. Nucl. Chem. 16 77. (10.1016/0022-1902(60)80090-5)
{'key': 'p_17', 'first-page': '89', 'article-title': 'Z. anorg', 'volume': '277', 'author': 'Brauer G.', 'year': '1954', 'journal-title': 'Chem.'} / Chem. / Z. anorg by Brauer G. (1954)
Buerger M. J. 1951 Phase transformations in solids (ed. Smoluchowski al.) pp. 183 to 209. London: Chapman and Hall.
Gahn J. W. 1961
{'key': 'p_20', 'first-page': '907', 'article-title': 'Acta M etall.9,795', 'volume': '10', 'author': 'Cahn J. W.', 'year': '1962', 'journal-title': 'ActaMetall.'} / ActaMetall. / Acta M etall.9,795 by Cahn J. W. (1962)
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Czanderna A. W. 1957 Thesis Purdue University.
Everett D. H. & Nordon P. i 960 Proc. Roy. Soc. A 259 341.
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{'key': 'p_29', 'first-page': '267', 'volume': '85', 'author': 'Fert A.', 'year': '1962', 'journal-title': 'Bull. Soc.frang. Miner. Cryst.'} / Bull. Soc.frang. Miner. Cryst. by Fert A. (1962)
Adv.Chem. Ser. 39 46.

Dates

Type	When
Created	18 years, 8 months ago (Dec. 15, 2006, 5:43 p.m.)
Deposited	4 years, 6 months ago (Feb. 17, 2021, 1:06 a.m.)
Indexed	1 month, 3 weeks ago (July 1, 2025, 11:42 a.m.)
Issued	59 years, 3 months ago (May 19, 1966)
Published	59 years, 3 months ago (May 19, 1966)
Published Online	28 years, 7 months ago (Jan. 1, 1997)
Published Print	59 years, 3 months ago (May 19, 1966)

Funders 0

None

BibTeX

@article{1966, volume={259}, ISSN={2054-0272}, url={http://dx.doi.org/10.1098/rsta.1966.0025}, DOI={10.1098/rsta.1966.0025}, number={1106}, journal={Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences}, publisher={The Royal Society}, year={1966}, month=may, pages={583–614} }

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