Handbook of Inorganic Substances

2018

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The isothermal section of the phase diagram of the Lu-Ag-Ge system at 500°С was investigated based on X-ray diffraction and microstructure analysis. The binary compound LuAg 2 (structure type MoSi 2 , Pearson symbol tI6, space group I4/mmm) was found to dissolve up to 20 at.% Ge: a = 3.6297(6)-3.6292(6), c = 9.191(7)-9.2341(7) Å. The other binary compounds of the Lu-Ag and Lu-Ge systems dissolve not more than 5 at.% of the third component. The ternary compound LuAgGe (structure type ZrNiAl, Pearson symbol hP9, space group P-62m, a = 7.0677(4), c = 4.1665(3) Å) was confirmed. An additional, new phase with unknown structure was observed in an alloy of nominal composition Lu 52 Ag 9 Ge 39 .

Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 98%

Interaction of the components in the system Lu–Ag–Ge at 500°C

Belan¹,

Manyako²,

2018

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“…• Color: Color has tentatively been assigned also at the phase level [35], but is in some cases strongly composition-dependent, or due to small amounts of impurities.…”

Section: Phase Classificationsmentioning

confidence: 99%

“…The Landolt-Börnstein handbook series Inorganic Crystal Structures [39] and the Handbook of Inorganic Substances [35], also contain PAULING FILE crystal structure data. The former describes structure prototypes in space groups 123-230, whereas the most recent edition of the latter lists crystallographic data for 157'000 inorganic phases.…”

Section: Products Containing Pauling File Datamentioning

confidence: 99%

PAULING FILE - towards a holistic view

Villars¹,

Cenzual²,

et al. 2018

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The PAULING FILE is a relational database for materials scientists, grouping crystallographic data, phase diagrams, and physical properties of inorganic crystalline substances under the same frame. Focus is on experimental observations and the data are processed from the original publications, covering world literature from 1900 to present date. Each individual crystal structure, phase diagram, or physical properties database entry contains data from a particular publication, but the linkage of the different data sets is achieved via the Distinct Phases concept, considering the chemical system and the crystal structure, or domain of existence, of different phases. At the present stage of development (2016), the PAULING FILE contains over 310'000 crystal structure entries (including atom coordinates and displacement parameters, when relevant) for some 140'000 different phases, more than 44'000 phase diagrams (with updated phase assignment) for near 9'800 chemical systems, and 120'000 physical properties entries (420'000 numerical values and 130'000 figure descriptions) for some 50'000 phases. To reach this result, more than 160'000 scientific publications have been processed. The aim of the PAULING file is to give easy access to large amounts of different kinds of critically analyzed experimental data, and by this propose a general overview on crystalline inorganic substances, offering possibilities to reveal yet undiscovered patterns among data and facilitate a sensible and efficient search for new materials with tailored properties. In combination with different data mining and knowledge discovery techniques, the PAULING FILE provides examples of holistic views on inorganic crystalline substances, confirming that "the whole is greater than the sum of its parts".

“…The binary systems R-Ge (where R is a rare-earth element) have been studied by different groups in order to determine the phase equilibria and the crystal structures of the compounds [1][2][3]. In all these systems the concentration range 60-66.7 at.% Ge is particularly rich in compounds, which can be expressed by the general formula RGe 2-x , where x = 0-0.5.…”

Section: Introductionmentioning

confidence: 99%

Crystal structure of praseodymium germanide PrGe1.91

Savysyuk¹,

SEMUSO²,

et al. 2017

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The structure of the binary germanide PrGe 1.910(7) has been determined by single-crystal X-ray diffraction: Pearson symbol oS36-12.72, space group Cmmm, a = 4.2721(6), b = 30.673(4), c = 4.1433(6) Å, Z = 8. The structure is a derivative of the type TbGe 2 and related to the types (Sm,Lu)Ge 1.85 and DyGe 1.85 . These types can be represented as a linear intergrowth of three consecutive AlB 2 -type slabs of trigonal prisms and two CaF 2 -type slabs.Germanide / Praseodymium / Single-crystal X-ray diffraction / Crystal structure / Vacancy derivative