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Title: Crystal structure, magnetization, 125 Te NMR, and Seebeck coefficient of Ge 49 Te 50 R 1 (R = La, Pr, Gd, Dy, and Yb)

Authors:
; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1398051
Grant/Contract Number:
AC02-07CH11358
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Materials Chemistry and Physics
Additional Journal Information:
Journal Volume: 192; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-05 03:07:51; Journal ID: ISSN 0254-0584
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English

Citation Formats

Levin, E. M., Cooling, C., Bud’ko, S. L., Straszheim, W. E., and Lograsso, T. A. Crystal structure, magnetization, 125 Te NMR, and Seebeck coefficient of Ge 49 Te 50 R 1 (R = La, Pr, Gd, Dy, and Yb). Netherlands: N. p., 2017. Web. doi:10.1016/j.matchemphys.2017.01.038.
Levin, E. M., Cooling, C., Bud’ko, S. L., Straszheim, W. E., & Lograsso, T. A. Crystal structure, magnetization, 125 Te NMR, and Seebeck coefficient of Ge 49 Te 50 R 1 (R = La, Pr, Gd, Dy, and Yb). Netherlands. doi:10.1016/j.matchemphys.2017.01.038.
Levin, E. M., Cooling, C., Bud’ko, S. L., Straszheim, W. E., and Lograsso, T. A. Mon . "Crystal structure, magnetization, 125 Te NMR, and Seebeck coefficient of Ge 49 Te 50 R 1 (R = La, Pr, Gd, Dy, and Yb)". Netherlands. doi:10.1016/j.matchemphys.2017.01.038.
@article{osti_1398051,
title = {Crystal structure, magnetization, 125 Te NMR, and Seebeck coefficient of Ge 49 Te 50 R 1 (R = La, Pr, Gd, Dy, and Yb)},
author = {Levin, E. M. and Cooling, C. and Bud’ko, S. L. and Straszheim, W. E. and Lograsso, T. A.},
abstractNote = {},
doi = {10.1016/j.matchemphys.2017.01.038},
journal = {Materials Chemistry and Physics},
number = C,
volume = 192,
place = {Netherlands},
year = {Mon May 01 00:00:00 EDT 2017},
month = {Mon May 01 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.matchemphys.2017.01.038

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  • Crystals of nonstoichiometric phases Sr{sub 1-x}R{sub x}F{sub 2+x} (R are 14 rare-earth elements) and the ordered phase Sr{sub 4}Lu{sub 3}F{sub 17} with a trigonally distorted fluorite lattice were grown by the Bridgman method. Ten of 26 Sr{sub 1-} {sub x}R{sub x}F{sub 2+x} crystals, where R = La-Ho or Y, melt congruently. The isoconcentration series Sr{sub 0.90}R{sub 0.10}F{sub 2.10} includes four crystals with R = Er-Lu. The compositions corresponding to the maxima for the latter crystals were not determined. The concentration series, in which the mole fraction of RF{sub 3} varies from 10 to 50 mol %, were obtained for themore » crystals with R = La, Nd, and Gd. Most of the crystals are of good optical quality. To evaluate the composition changes in the course of crystal growth, the cubic unit-cell parameters were determined by X-ray powder diffraction. The line-broadening analysis revealed a nonmonotonic change of microdistortions as regards both the rare-earth content and rare-earth series. The changes in the lattice parameters and the congruent-melting points of the Sr{sub 1-x}R{sub x}F{sub 2+x} phases in the rare-earth series reflect the morphotropic transitions in the series of pure RF{sub 3} despite the fact that SrF{sub 2} dominates in nonstoichiometric fluorite crystals.« less
  • We conducted a detailed study of the structure and magnetic properties of ([ital R][sub 1[minus][ital x]]Pr[sub [ital x]])Ba[sub 2]Cu[sub 3]O[sub 7] sintered samples, where [ital R]=Lu, Yb, Tm, Er, Y, Ho, Dy, Gd, Eu, Sm, and Nd for [ital x]=0.5--1.0. We found that the temperature dependence of the dc susceptibility follows the Curie-Weiss law in the temperature range 20--300 K and the paramagnetism of the Pr and [ital R] sublattices exist independently of one another. The antiferromagnetic ordering temperature [ital T][sub [ital N]] of Pr ions decreases monotonically with increasing [ital R] concentration (1[minus][ital x]). At a given [ital x],more » [ital T][sub [ital N]] is [ital R]-ion-size dependent. The slope in the [ital T][sub [ital N]] vs [ital x] curve is steeper for ions with smaller ionic radii. The observed results are interpreted in terms of the hybridization between the local states of the Pr ion and the valence-band states of the CuO[sub 2] planes.« less
  • The existence of ternary compounds according to the formula REFe{sub 12{minus}{ital x}} Ga{sub {ital x}} which for {ital x} {approximately}6 represents the iron-rich end of a homogeneous range has been confirmed. X-ray powder analysis of alloys annealed at 800 {degree}C or above generally reveal isotypism with the body- centered tetragonal ThMn{sub 12} -type structure. For the alloys with heavier rare-earth elements from Gd to Lu a phase transition to a body-centered orthorhombic structure type (ScFe{sub 6} Ga{sub 6} type) is observed, which has not been reported before. The transition corresponds to a crystallographic group-subgroup relation ({ital I}4/{ital mmm}{r arrow}{ital t}{submore » 2} {r arrow}{ital Immm}), and the transition temperature increases with the ordinal number of the rare earth, indicating the higher the stability of the ScFe{sub 6} Ga{sub 6} -type structure, the smaller the radius of the rare-earth element. Accordingly, the ThMn{sub 12} -type structure is stable for the early rare-earth members and no transition was observed as low as 400 {degree}C. From magnetization curves it is shown that for REFe{sub 12{minus}{ital x}} Ga{sub {ital x}} (RE=rare earth, Y) all magnetic sublattices order simultaneously at temperatures above {Tc} {approximately}400 K. For Y, Lu, and light rare-earth-containing alloys collinear or canted ferromagnetism is observed. The vector of magnetization was found to be close to the {ital a},{ital b} plane. Strong hysteresis effects are revealed in all alloys. Energy products are highest for (Pr,Sm)Fe{sub {approximately}6}Ga{sub {approximately}6}. For the compounds with the heavy rare-earth elements a ferrimagnetic behavior is encountered. Both magnetic sublattices, i.e., Fe and RE, couple antiparallel, exhibiting easy plane anisotropy. The crystallographic transformation, tetragonal-orthorhombic, has little effect on the magnetic behavior of these alloys.« less