Phosphidtelluriden auf der Spur: Zum System Ce/Te/P. The Trace to Phosphide Tellurides: The System Ce/Te/P

Philipp, Frauke; Pinkert, Katja; Schmidt, Peer

doi:10.1002/zaac.200801396

Cited by 8 publications

(5 citation statements)

References 21 publications

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“…After optimization of standard data by fitting the experimental binary phase diagram further calculation of the pressure dependent existence of binary phases resulted in the respective phase barogram . This procedure has already been successfully applied for evaluation of synthesis conditions and description of existence ranges of ternary phosphide tellurides …”

Section: Resultsmentioning

confidence: 99%

“…[34] This procedure has already been successfully applied for evaluation of synthesis conditions and description of existence ranges of ternary phosphide tellurides. [35][36][37][38] As experimental data were given for both the phase diagram and thermodynamic standard values, the system gadoliniumtellurium was chosen as a model system. The binary phase diagram Gd-Te, as referenced by Zargaryan [39] and Massalski [40] contains the binary phases GdTe, Gd 3 Te 4 , Gd 2 Te 3 , Gd 4 Te 7 , GdTe 2 , Gd 2 Te 5 , and GdTe 3 .…”

Section: Assessment Of the Phase Diagram Gd-tementioning

confidence: 99%

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Rare Earth Metal PolytelluridesRETe_1.8(RE= Gd, Tb, Dy) – Directed Synthesis, Crystal and Electronic Structures, and Bonding Features

Poddig

Donath

Gebauer

et al. 2018

Zeitschrift anorg allge chemie

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Single crystals of the polytellurides RETe1.8 of gadolinium, terbium, and dysprosium were prepared by chemical vapor transport and alkali metal halide flux reactions. To determine proper synthesis conditions for the desired target composition, the binary phase diagram Gd‐Te was evaluated by CalPhaD methods. The compounds are isostructural to SmTe1.8 and crystallize in space group P4/n (no. 85) with lattice parameters of a = 966.10(4), 960.00(3), and 957.33(2) pm and c = 1794.15(10), 1785.77(6), and 1779.38(5) pm for GdTe1.8, TbTe1.8 and DyTe1.8, respectively. The structures consist of puckered [RETe] double slabs and planar telluride layers composed of Te2 dumbbells and linear Te3 units in accordance with ELI‐D based bonding analyses. The latter can be understood as a Te34– anion. GdTe1.8 is a semiconductor with a bandgap of 0.19 eV/0.17 eV (experimental/calculated). Magnetization data confirm trivalent RE ions and indicate antiferromagnetic order at TN = 12 K for TbTe1.8 and TN = 9.8 K for DyTe1.8, whereas GdTe1.8 remains paramagnetic down to 2 K.

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Section: Resultsmentioning

confidence: 99%

Section: Assessment Of the Phase Diagram Gd-tementioning

confidence: 99%

Rare Earth Metal PolytelluridesRETe_1.8(RE= Gd, Tb, Dy) – Directed Synthesis, Crystal and Electronic Structures, and Bonding Features

Poddig

Donath

Gebauer

et al. 2018

Zeitschrift anorg allge chemie

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“…As the tellurium anions in Zr 1.28 Te 2 occupy the phosphorus anion position (Wyckoff position 2 a ), a mixed occupation by both anions is conceivable. Mixed occupations by phosphorus and tellurium anions, which differ considerably in size, are already known in the form of planar 4 4 grids in the compound CeP x Te 2– x 11. On the basis of the structural model for 4 f (Zr 2– x ) 2 a (P 1– y Te y ) 2 d (Te) [ P 6 3 / mmc (no.…”

Section: Resultsmentioning

confidence: 99%

Homogeneity Range of the Zirconium Phosphide Telluride Zr_2+xPTe₂ and the High‐Temperature Phase Transformation to Zr₂PTe

Scholz

Schmidt

2015

Eur J Inorg Chem

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The synthesis of the phosphide telluride Zr2+xPTe2 was accomplished by a solid‐state reaction from the elements. Le Bail refinements of the data from the as‐synthesized crystalline powders as well as the thermal decomposition of Zr2PTe2 along the homogeneity range Zr2+xPTe2 with the release of P4(g) and Te2(g) evidence a maximum zirconium content corresponding to the composition Zr2.5PTe2. The thermal decomposition product of Zr2.5PTe2 undergoes a phase transformation to “Zr2PTe”, which adopts the structural motif of the binary phases ZrTe and ZrTe2. The new phase “Zr2PTe” has a wide homogeneity range Zr2–xP1–yTe1+y and tolerates a deficit in the cation position and a mixed occupation of the anions. The composition of the crystalline decomposition product was determined to be Zr1.95P0.84Te1.16 by Rietveld refinement and by analysis of the elemental composition by inductively coupled plasma optical emission spectroscopy (ICP‐OES). Zr1.95P0.84Te1.16 crystallizes in the hexagonal space group P63/mmc (no. 194) with lattice constants a = 3.8726(1) Å and c = 13.008(1) Å.

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“…Further calculations of phase equilibria in the quaternary systems M/P/Te/O (M = Ti, Zr, Ce) became feasible by addition of the data sets of the constitutive ternary systems. The concerning data of the systems M/P/Te was optimised previously [44,46,47].…”

Section: Characterisationmentioning

confidence: 99%

“…If also the gaseous species P 4 O 6(g) is taken into account, it can be seen that the level of this equalisation lies at Ti 2 O 3 besides elemental tellurium and phosphorus ( Figure 1). In the same way the formation of the zirconium phosphide telluride Zr 2+δ PTe 2 [46] and the cerium phosphide tellurides Ce 3 Te 4-x P x and CeTe 2-x P x [47] can be understood. Remarkably, the equilibrium state for the thermite reaction is distinct for each system: Ti 2 O 3 , ZrO 2 [Equation (2)] and Ce 2 O 2 Te [Equations (3) and (4)].…”

mentioning

confidence: 99%

The Thermochemical Behaviour of Te₈O₁₀(PO₄)₄ and its Use for Phosphide Telluride Synthesis

Schmidt¹,

Dallmann²,

Kadner³

et al. 2009

Zeitschrift anorg allge chemie

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The tellurium oxide phosphate Te 8 O 10 (PO 4 ) 4 was synthesised by thermal decomposition of Te 2 O 3 HPO 4 at temperatures above 400°C. Te 8 O 10 (PO 4 ) 4 melts at 570°C and evaporates at 820°C. The thermodynamic standard data were determined by solution calorimetry and differential scanning calorimetry and were optimised by thermodynamic model- IntroductionA quite large number of metal pnictide chalcogenides have so far been described as antimonide selenides [1-5], antimonide tellurides [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], arsenide selenides [4,[18][19][20][21][22][23][24][25][26][27][28][29][30][31], arsenide tellurides [18,[30][31][32][33][34][35][36][37], and even phosphide sulfides [6, 18,29,[38][39][40][41][42] and phosphide selenides [4, 18,23,[40][41][42]. On the other hand, ternary phosphide tellurides seem to be extraordinary compounds, as only a small number of those are known by now. Some of them consist of isolated phosphide and telluride anions: the uranium phosphide telluride UPTe [43] and the recently found compounds Ti 2 PTe 2 [44, 45], Zr 2 PTe 2 [46] and Ce 3 Te 4-x P x [47]. Beside these compounds, other phosphorus and tellurium containing compounds are described: The telluro-phosphides IrPTe [48], OsPTe [49] and RuPTe [49], which consist of M 3+ cations besides [P-Te] 3dumbbells, and the compound BaP 4 Te 2 [50] build from Ba 2+ cations and 1 ∞ [P 4 Te 2 ] 2anions. On the other hand, in the cationic clathrate Si 46-2x P 2x Te x [51,52] the framework is built from 4-bonded silicon and phosphorus atoms, the cages are filled with tellurium atoms. As the smaller cages in type I clathrate structures are often only filled partially with tellurium, the compound exhibits a phase width.Remarkably, no binary phosphorus-tellurium compounds are known, which additionally reflects the low affinity of the two elements to each other. Therefore, the synthesis of compounds that contain phosphorus and tellurium is quite challenging and 2153 ling of the binary system TeO 2 /P 2 O 5 : ∆H 0 298 [Te 8 O 10 (PO 4 ) 4 ] = -5844(2) kJ·mol -1 ; S 0 298 [Te 8 O 10 (PO 4 ) 4 ] = 823.3 J·mol -1 ·K -1 . The phase relations in quaternary systems M/P/Te/O (M = Ti, Zr, Ce) were calculated and optimised synthesis parameters for phosphide tellurides were derived.

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Phosphidtelluriden auf der Spur: Zum System Ce/Te/P. The Trace to Phosphide Tellurides: The System Ce/Te/P

Cited by 8 publications

References 21 publications

Rare Earth Metal PolytelluridesRETe_1.8(RE= Gd, Tb, Dy) – Directed Synthesis, Crystal and Electronic Structures, and Bonding Features

Rare Earth Metal PolytelluridesRETe_1.8(RE= Gd, Tb, Dy) – Directed Synthesis, Crystal and Electronic Structures, and Bonding Features

Homogeneity Range of the Zirconium Phosphide Telluride Zr_2+xPTe₂ and the High‐Temperature Phase Transformation to Zr₂PTe

The Thermochemical Behaviour of Te₈O₁₀(PO₄)₄ and its Use for Phosphide Telluride Synthesis

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Phosphidtelluriden auf der Spur: Zum System Ce/Te/P. The Trace to Phosphide Tellurides: The System Ce/Te/P

Cited by 8 publications

References 21 publications

Rare Earth Metal PolytelluridesRETe1.8(RE= Gd, Tb, Dy) – Directed Synthesis, Crystal and Electronic Structures, and Bonding Features

Rare Earth Metal PolytelluridesRETe1.8(RE= Gd, Tb, Dy) – Directed Synthesis, Crystal and Electronic Structures, and Bonding Features

Homogeneity Range of the Zirconium Phosphide Telluride Zr2+xPTe2 and the High‐Temperature Phase Transformation to Zr2PTe

The Thermochemical Behaviour of Te8O10(PO4)4 and its Use for Phosphide Telluride Synthesis

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Rare Earth Metal PolytelluridesRETe_1.8(RE= Gd, Tb, Dy) – Directed Synthesis, Crystal and Electronic Structures, and Bonding Features

Rare Earth Metal PolytelluridesRETe_1.8(RE= Gd, Tb, Dy) – Directed Synthesis, Crystal and Electronic Structures, and Bonding Features

Homogeneity Range of the Zirconium Phosphide Telluride Zr_2+xPTe₂ and the High‐Temperature Phase Transformation to Zr₂PTe

The Thermochemical Behaviour of Te₈O₁₀(PO₄)₄ and its Use for Phosphide Telluride Synthesis