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  • 1
    Electronic Resource
    Electronic Resource
    Formation and general characterization of a previously unknown ytterbium silicate (A-type Yb2SiO5) (1997)
    Springer
    Journal of materials science 32 (1997), S. 6135-6139 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract On non-isothermal oxidation of ytterbium nitrogen woehlerite (Yb4Si2O7N2), also known as the J-phase, a previously unknown and possibly metastable modification of Yb2SiO5 was detected. It is isostructural with the A-type RE2SiO5 modifications (RE=rare-earth element). The crystallographic data and stability of this new modification of Yb2SiO5 are discussed and compared with available data on RE2SiO5 compounds. The present results suggest that, in general, oxidation of rare-earth oxynitride phases might prove to be a fruitful method to obtain phases that are metastable or cannot be prepared by standard methods since their low-temperature stability range would require unrealistically long firing periods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018656204229
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  • 2
    Electronic Resource
    Electronic Resource
    Thermochemical and structural investigations (1996)
    Springer
    Journal of thermal analysis and calorimetry 46 (1996), S. 1239-1249 
    Details
    ISSN: 1572-8943
    Keywords: DTA ; galvanic bromine cells for solid electrolytes ; pseudobinary systems ; ABr/SmBr3 ; solution calorimetry ; XRD
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The phase diagrams of the systems ABr/SmBr3 were reinvestigated. The findings of Blachnik for the systems withA=Cs, Rb, K were confirmed; however, the dimorphic compound K3SmBr6 is stable only above 572 K. The equilibrium temperature, found bye.m.f.-measurements in a solid state galvanic cell for the reaction KBr+K2SmBr5=L-K3SmBr6, is smaller (522 K). The formation temperature for Rb3SmBr6 is 279 K (DTA) and 256 K (e.m.f.) resp. By solution calorimetry was proved that the compounds Cs2SmBr5 and KSm2Br7 don't exist at 0 K. In the system NaBr/SmBr3 only one hitherto unknown dimorphic compound Na3SmBr3 exists above 473 K. L-Na3SmBr crystallizes in the hexagonal space groupR¯3, above 519 K H-Na3SmBr6 has the monoclinic cryolite-structure. Powder patterns of other compounds not yet investigated — H-/L-A3 SmBr6, ASm2Br7 (A=Cs, Rb, K) and Cs2SmBr5 — were indexed analogously to known structure families. The structure parameters of SmBr3·6H2O were determined by single-crystal measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01979238
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  • 3
    Electronic Resource
    Electronic Resource
    Retarded solid state reactions III [1] (1997)
    Springer
    Journal of thermal analysis and calorimetry 49 (1997), S. 1207-1210 
    Details
    ISSN: 1572-8943
    Keywords: metastable states ; reconstructive phase transitions ; ternary lanthanide chlorides ; thermal hysteresis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Solid state reactions and reconstructive phase transitions exhibit more or less a large hysteresis between reaction temperatures taken from DTA-heating and -cooling curves. For ternary lanthanide chlorides the equilibrium temperatures could be obtained bye.m.f.-measurements in galvanic chlorine cells for solid electrolytes usingA +-ion (A=alkaline metal) conducting diaphragms. By quenching, high-temperature phases can often be transformed to metastable room-temperature phases. In this case the equilibrium state must be established by annealing at sufficiently high temperature, or it must be tried to synthesize the compound in its stability range from suitable precursor systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01983676
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  • 4
    Electronic Resource
    Electronic Resource
    Interaction of Thulium, Ytterbium(III) and Lutetium Chlorides with Sodium Chloride (1999)
    Springer
    Journal of thermal analysis and calorimetry 57 (1999), S. 203-208 
    Details
    ISSN: 1572-8943
    Keywords: crystal structures ; phase diagrams ; ternary lanthanide chlorides ; thermodynamic properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The pseudobinary systems NaCl—LnCl3 (Ln=Tm, Yb, Lu) were investigated by DTA and X-ray diffraction. Two types of ternary chlorides exist: congruently melting compounds Na3LnCl6 with the cryolite-structure, incongruently melting compounds NaLnCl4 with the NaErCl4-Ln (Ln=Tm) or the NaLnCl4-structure (Ln=Yb, Lu). All these structure types contain [LnCl6]-octahedra. By solution calorimetry and e.m.f. measurements in galvanic cells for solid electrolytes could be proved that all compounds are formed from NaCl and LnCl3 by gain in lattice enthalpy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010115407242
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  • 5
    Electronic Resource
    Electronic Resource
    Ternary molybdenum(III) chlorides (1997)
    Springer
    Journal of thermal analysis and calorimetry 50 (1997), S. 63-71 
    Details
    ISSN: 1572-8943
    Keywords: crystal structures ; phase diagrams of systems ACl/MoCl3 from 0–40 mol% MoCl3 ; preparation of A3Mo2Cl9 from formic acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The phase diagrams of ACl/MoCl3 (A=Na, K, Rb, Cs) were elucidated by DTA measurements in sealed quartz ampoules in the range of 0–40 mol% MoCl3. The samples were prepared from alkali metal chlorides and the compounds A3MoCl6 or A3Mo2Cl9. The 3∶1 compounds withA=Na, Rb, Cs were obtained by sintering mixtures of 3ACl+MoCl3; the enneachlorides A3Mo2Cl9 withA=K, Rb, Cs were precipitated from solutions of MoCl3·3H2O and ACl in formic acid. Congruently melting compounds A3MoCl6 exist in all four systems, incongruently melting enneachlorides A3Mo2Cl9 in systems withA=K, Rb, Cs. Still unknown structures were determined by analog-indexing powder patterns according to known structure families. Especially Cs3MoCl6 is isotypic with the recently found Cs3CrCl6 structure. Additionally, the unit cell parameters were determined for the compounds A3MoCl5·H2O (A=K, Rb, Cs) analogous to Cs2TiCl5·H2O, whose structure was determined by single crystal measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01979549
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  • 6
    Electronic Resource
    Electronic Resource
    Ternäre Chloride in den Systemen NaCl/HoCl3 und NaCl/ErCl3Professor Dieter Seebach zum 60. Geburtstag gewidmet (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 1525-1528 
    Details
    ISSN: 0044-2313
    Keywords: Ternary sodium chlorides ; Holmium ; Erbium ; Phase diagrams ; Thermodynamic properties ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ternary Chlorides in the Systems NaCl/HoCl3 and NaCl/ErCl3Phase diagrams of the systems NaCl/HoCl3 and NaCl/ErCl3 were determined by means of DTA and high-temperature XRD. There exist compounds Na3LnCl6, NaLnCl4 (Ln = Ho, Er) and NaHo2Cl7. NaHoCl4 undergoes a phase transition at 374°C from the NaGdCl4- to the NaErCl4- type of structure. The thermodynamic functions for the formation of the compounds from NaCl and LnCl3 were determined by solution calorimetry and e.m.f. measurements in galvanic cells for solid electrolytes. The compounds NaLnCl4 are the most stable ones.
    Notes: Die Zustandsdiagramme der Systeme NaCl/HoCl3 und NaCl/ErCl3 wurden mittels DTA und Hochtemperatur-Guinieraufnahmen untersucht. Es existieren Verbindungen Na3LnCl6 und NaLnCl4 (Ln = Ho, Er) sowie NaHo2Cl7. NaHoCl4 wandelt sich bei 374° vom NaGdCl4- in den NaErCl4-Typ um. Mittels Lösungskalorimetrie und EMK-Messungen in galvanischen Feststoffzellen wurden die thermodynamischen Funktionen der ternären Chloride bezüglich der Bildung aus NaCl und LnCl3 bestimmt. Die Verbindungen NaLnCl4 weisen die größte Stabilität auf.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19976231009
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  • 7
    Electronic Resource
    Electronic Resource
    Zur Thermochemie und Struktur von Berylliumchlorid (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1723-1726 
    Details
    ISSN: 0044-2313
    Keywords: Beryllium dichloride ; dimorphy ; enthalpy ; entropy ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Thermochemistry and Structure of Beryllium ChlorideBeCl2 is dimorphous, with a transition point at 405°C. The transition enthalpy and transition entropy have been determined by solution calorimetry: ΔUH° = 2.9 kJmol-1 and ΔUS° = 9.7 JK-1mol-1.The previously known SiS2-type structure of BeCl2 is that of the high temperature phase. The structure of the phase stable at room temperature has been determined from single crystal data. a = 1 062.4(6) pm, c = 1 804(2) pm, I41/acd, Z = 32, R = 0.038 (Mg(NH2)2-type). The structure consists of P4O10-like [Be4Cl6Cl4/2]-units, connected by their terminal anions.
    Notes: BeCl2 ist dimorph, die Umwandlungstemperatur liegt bei 405°C. Aus lösungskalorimetrischen Messungen ergibt sich als Differenz der Lösungsenthalpien eine Umwandlungsenthalpie von ΔUH° = 2,9 kJmol-1 und eine Umwandlungsentropie ΔUS298° = 9,7 JK-1 mol-1.Die bislang bekannte Struktur im SiS2-Typ ist die der Hochtemperaturphase. Die Struktur von bei Raumtemperatur stabilem T-BeCl2 wurde aus Einkristalldaten bestimmt. a = 1 062,4(6) pm, c = 1 804(2) pm, I41/acd, Z = 32, R = 0,038 (Mg(NH2)2-Typ). Es liegen (Be4Cl6Cl4/2)-Einheiten vor, die dem Bauprinzip von P4O10 entsprechen, aber über ihre terminalen Chlorid-Ionen verknüpft sind.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956211018
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  • 8
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    Zur Thermochemie und Struktur von Berylliumchlorid (1995)
    Wiley
    Details
    Publication Date: 1995-10-01
    Print ISSN: 0044-2313
    Electronic ISSN: 1521-3749
    Topics: Chemistry and Pharmacology
    Published by Wiley
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  • 9
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    Tern�re Chloride in den Systemen NaCl/HoCl3 und NaCl/ErCl3 (1997)
    Wiley
    Details
    Publication Date: 1997-10-01
    Print ISSN: 0044-2313
    Electronic ISSN: 1521-3749
    Topics: Chemistry and Pharmacology
    Published by Wiley
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  • 10
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    Ternäre Chloride in den Systemen ACl/YCl3 (A = Cs, Rb, K, Na) (1998)
    Wiley
    Details
    Publication Date: 1998-02-01
    Print ISSN: 0044-2313
    Electronic ISSN: 1521-3749
    Topics: Chemistry and Pharmacology
    Published by Wiley
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