Notizen: Volume Changes on Melting for Several Rare Earth Chlorides

Molar volumes in the liquid state and melting points of several rare earth chlorides RCl3 (R = La, Pr, Nd, Gd, Dy, and Y) have been measured by dilatometry and DTA. respectively. The volume changes on melting of these chlorides were evaluated on the basis of these result and available crystal structure data. The volume increase on melting of the hexagonal chlorides from LaCl3 to GdCl3 was found to be more than 20%. On the other hand, the volume changes of the monoclinic DyCl3 and YCl3 were less than 1%.

Download Full-text

Selection and Evaluation of Materials for Thermoelectric Applications II

MRS Proceedings ◽

10.1557/proc-478-15 ◽

1997 ◽

Vol 478 ◽

Cited By ~ 6

Author(s):

Jeff W. Sharp

Keyword(s):

Crystal Structure ◽

State Physics ◽

Solid State ◽

Band Structure ◽

Structure Data ◽

Crystal Structure Data ◽

Charge Carriers ◽

The Other ◽

New Materials ◽

Solid State Physics

AbstractIn good thermoelectrics phonons have short mean free paths, and charge carriers have long ones. The other requirements are a multivalley band structure and a band gap greater than 0.1 eV for the 200 to 300 K temperature range. We discuss the use of solid state physics and chemistry concepts, along with atomic and crystal structure data, to select the new materials most likely to meet these criteria.

Download Full-text

Alkylaluminum, -gallium, -magnesium, and -zinc monophenolates with bulky substituents

Zeitschrift für Naturforschung B ◽

10.1515/znb-2018-0176 ◽

2018 ◽

Vol 73 (11) ◽

pp. 943-951 ◽

Cited By ~ 1

Author(s):

Clint E. Price ◽

Ana B. Dantas ◽

Douglas R. Powell ◽

Rudolf J. Wehmschulte

Keyword(s):

Crystal Structure ◽

Solid State ◽

Nmr Spectroscopy ◽

Crystal Structures ◽

Structure Data ◽

Crystal Structure Data ◽

The Other ◽

Zinc Compounds ◽

C Nmr

AbstractThe bulky phenols 2,6-Ad2C6H3OH (Ad=adamantyl), A, (2,6-Ph2CH)2-4-Me-C6H2OH, B, and (2,6-Tol2CH)2-4-iPr-C6H2OH, C, react with one equivalent of Et3M (M=Al, Ga), Bu2Mg and Et2Zn to afford well-defined mono-phenolate complexes (ArOMRn)m. The aluminum and gallium phenolates derived from the very bulky phenol A are likely monomeric in the solid state. The other compounds are dimeric with bridging phenolates. Crystal structures of compounds with phenols B and C display the dimeric M2O2 cores of the phenolates and illustrate some deviations for the magnesium and zinc compounds. The former possesses stabilizing Mg···C contacts with one of the flanking arene groups of the phenolate substituent, and the latter may be viewed as an intermediate between a symmetric dimer and two monomers. All compounds were characterized by 1H and 13C NMR spectroscopy, and their solution spectra are in agreement with the crystal structure data.

Download Full-text

X-ray powder data for Nd2Co14B, Pr2Co14B and Pr2Fe14B

Powder Diffraction ◽

10.1017/s0885715600019205 ◽

1994 ◽

Vol 9 (3) ◽

pp. 189-193 ◽

Cited By ~ 1

Author(s):

A. M. Wims ◽

C. D. Fuerst

Keyword(s):

Crystal Structure ◽

Rare Earth ◽

Neutron Diffraction ◽

Magnetic Materials ◽

Structure Data ◽

Crystal Structure Data ◽

Computer Programs ◽

X Ray Diffraction ◽

X Ray

The crystal structure data have been determined by X-ray diffraction for three rare earth magnetic materials, Nd2Co14B, Pr2Co14B, and Pr2Fe14B. The data were evaluated with several computer programs desingned for that purpose. The crystal structure for Nd2Co14B and Pr2Fe14D determined by X-ray diffraction agree with those obtained earlier by neutron diffraction.

Download Full-text