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The Magnetic Properties of High Purity Scandium, Yttrium, Lanthanum and Lutetium and the Effects of Impurities on These Properties

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The Magnetic Properties of High Purity Scandium, Yttrium, Lanthanum and Lutetium and the Effects of Impurities on These Properties Iowa State University Capstones, Theses and Retrospective Theses and Dissertations Dissertations 1972 The am gnetic properties of high purity scandium, yttrium, lanthanum and lutetium and the effects of impurities on these properties John Joseph Croat Iowa State University Follow this and additional works at: https://lib.dr.iastate.edu/rtd Part of the Metallurgy Commons Recommended Citation Croat, John Joseph, "The am gnetic properties of high purity scandium, yttrium, lanthanum and lutetium and the effects of impurities on these properties" (1972). Retrospective Theses and Dissertations. 5898. https://lib.dr.iastate.edu/rtd/5898 This Dissertation is brought to you for free and open access by the Iowa State University Capstones, Theses and Dissertations at Iowa State University Digital Repository. It has been accepted for inclusion in Retrospective Theses and Dissertations by an authorized administrator of Iowa State University Digital Repository. For more information, please contact [email protected]. INFORMATION TO USERS This dissertation was produced from a microfilm copy of the original document. While the most advanced technological means to photograph and reproduce this document have been used, the quality is heavily dependent upon the quality of the original submitted. The following explanation of techniques is provided to help you understand markings or patterns which may appear on this reproduction. 1. The sign or "target" for pages apparently lacking from the document photographed is "Missing Page(s)". if it was possible to obtain the missing page(s) or section, they are spliced into the film along with adjacent pages. This may have necessitated cutting thru an image and duplicating adjacent pages to insure you complete continuity. 2. When an image on the film is obliterated with a large round black mark, it is an indication that the photographer suspected that the copy may have moved during exposure and thus cause a blurred image. You will find a good Image of the page in the adjacent frame. 3. When a map, drawing or chart, etc., was part of the material being photographed the photographer followed a definite method in "sectioning" the material. It is customary to begin photoing at the upper left hand corner of a large sheet and to continue photoing from left to right in equal sections with a small overlap. If necessary, sectioning is continued again — beginning below the first row and continuing on until complete. 4. The majority of users indicate that the textual content is of greatest value, however, a somewhat higher quality reproduction could be made from "photographs" if essential to the understanding of the dissertation. Silver prints of "photographs" may be ordered at additional charge by writing the Order Department, giving the catalog number, title, author and specific pages you wish reproduced. University Microfilms 300 North Zeeb Road Ann Arbor, Michigan 48106 A Xerox Education Company 73-3871 CROAT, John Joseph, 194-3- THE MAGNETIC PROPERTIES OF HIGH PURITY SCANDIUM, YTTRIUM, LANTHANUM AND LUTETIUM AND THE EFFECTS OF IMPURITIES ON THESE PROPERTIES. Iowa State University, Ph.D., 1972 Engineering, metallurgy University Microfilms, A XEROXCompany, Ann Arbor, Michigan THIS DISSERTATION HAS BEEN MICROFILMED EXACTLY AS RECEIVED. The magnetic properties of high purity scandium, yttrium, lanthanum and lutetium and the effects of impurities on these properties by John Joseph Croat A Dissertation Submitted to the Graduate Faculty in Partial Fulfillment of The Requirements for the Degree of DOCTOR OF PHILOSOPHY Department: Metallurgy Major: Metallurgy (Physical Metallurgy) Approved : Signature was redacted for privacy. Signature was redacted for privacy. For the Major Departmeift Signature was redacted for privacy. For the Graduate College Iowa State University Ames, Iowa 1972 PLEASE NOTE: Some pages may have indistinct print. Filmed as received. University Microfilms, A Xerox Education Company ii TABLE OF CONTENTS Page I. INTRODUCTION 1 II. HISTORICAL 5 A. Scandium 5 B. Yttrium 12 C. Lanthanum 15 D. Lutetium 16 III. APPARATUS 17 A. Theory 17 B. Apparatus 18 1. Electrobalance 22 2. Sample suspension 23 3. Magnetic field gradient 26 IV. EXPERIMENTAL PROCEDURE 31 A. Sample Preparation 31 1. Metal preparation 31 2. Preparation of single crystal specimens 32 3. Attempts to grow lanthanum single 32 crystals 4. Preparation of polycrystalline specimens 34 B. Susceptibility Measurements 41 1. Sample positioning 41 2. Force measurements 42 3. Field dependence measurements 43 C. Methods of Analysis , 45 V. RESULTS 47 A. Scandium 47 1. Sample purity 47 2. Susceptibility of pure scandium 50 3. Susceptibility of scandium alloys 57 B. Yttrium 86 1. Sample purity 86 2. Susceptibility of pure yttrium 86 3. Susceptibility of yttrium alloys 95 C. Lanthanum 98 1. Sample purity 98 2. Susceptibility of dhcp lanthanum 100 3. Susceptibility of lanthanum alloys 102 4. Susceptibility of fee lanthanum 106 iii D. Lutetium 109 1. Sample purity 109 2. Susceptibility of pure lutetium 112 3. Susceptibility of lutetium alloys 117 VI. DISCUSSION 124 A. Pure Metals 124 B. Effects of Nonmagnetic Impurities 130 C. Behavior of Magnetic Impurities 137 D. Discussion of Error 139 VII. LITERATURE CITED 140 VII. ACKNOWLEDGMENTS 143 1 I. INTRODUCTION The group of elements commonly known as the rare earths include the lanthanide series and the elements scandium, yttrium and lanthanum. Scandium, yttrium and lanthanum are all reported to have a noble gas plus a (n-l)d ns electronic configuration. For elements following scandium and yttrium in the periodic table the electrons are added to the (n-l)d orbitals. However the elements following lanthanum are formed by the addition of electrons to the 4f orbitals which become more stable than the 5d orbitals. This continues across the periodic table until all seven of the 4f orbitals are occupied. Thus there are 14 lanthanides plus scandium, yttrium and lan­ thanum for a total of 17 rare earths. The study of the magnetic properties of the rare earth metals and alloys has commanded a great deal of interest pri­ marily because most of these elements have at least one un­ paired 4f electron which gives rise to large magnetic moments. The rare earths scandium, yttrium, lanthanum and lutetium, however, have no unpaired 4f electrons but are still of great interest because the smaller contributions to the suscepti­ bility are not swamped by the temperature dependent para­ magnetism and enables a more accurate determination of these contributions. The reason that the magnetic susceptibilities of these metals are not well known is due not to the diffi­ culty of measuring the small moments of approximately 10"^ 2 emu/gram but more importantly to the lack of well character­ ized and highly pure samples. Susceptibility results for both single and polycrystal- line scandium have been reported by a number of groups. Despite this neither x OT its temperature dependence have been well established. Even the most recent results disagree by as much as 8% at room temperature and considerably more than this at low temperatures. Similar discrepancies are also found in the case of yttrium and lanthanum. These discrepancies are generally thought to result from varying amounts of impurities in the measured specimens. To date, however, little is known of the effect of these impurities on the susceptibility. This is particularly true in the case of gaseous impurities. In the bulk of the previously reported data no analysis of these impurities was given. While analytical results for para­ magnetic impurities are more frequently reported, the large effect that even minute quantities of these impurities have at low temperatures requires that these analyses be very accurate in order to estimate their contribution to the susceptibility. Unfortunately, analyses of the required accuracy are difficult to obtain at this time. This is further complicated by the fact that the effective moments and paramagnetic Curie tempera­ tures of these impurities in metallic solutions are not well known. It is clear, therefore, that before reliable results of the magnetic properties of these rare earth metals can be obtained, very high purity samples must be prepared. 3 In recent years a study was undertaken at the Ames Lab­ oratory to increase the overall purity of the rare earth metals by several orders of magnitude. This effort has re­ sulted in significant increases in purity, especially with regard to gaseous impurities, tantalum and other rare earths. In addition significant progress has been made in the analysis of these metals by the various analytical groups, especially in mass spectroscopy. Through the introduction of calibrated standards the analysis of rare earths can now be determined with an accuracy of +20% in the 1 ppm range. This contrasts with other laboratories where the amount of rare earth impuri­ ties is known to within only 100 to 200% of the amount present. Due to both the greater purity and increased confidence in the analytical results, a study of the magnetic properties of scandium, yttrium, lanthanum and lutetium was under taken. The magnetic susceptibilities of these metals were measured from approximately 1.5 to 300°K by the Faraday technique. In the case of scandium, yttrium and lutetium both single and poly- crystalline specimens were measured. Attempts to grow single crystals of,lanthanum were unsuccessful and hence only poly- crystalline dhcp specimens were measured. A systematic study of the effect of nonmagnetic impurities on the susceptibility of these metals, particularly scandium, was carried out. The behavior of dilute magnetic rare earth impurities in a scandium matrix was also studied. In particular the susceptibility of 4 a series of dilute scandium-gadolinium and scandium-erbium alloys was investigated. 5 II. HISTORICAL A. Scandium The first published results on the susceptibility of poly- 1 crystalline scandium was by Bommer in 1939. His room temper­ ature value of 7.0x10'^ emu/gram is the highest reported to date but his sample is believed to have had considerable impur­ ities, including 85 wt % KCl which he corrected for.
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