Zobrazeno 1 - 10 of 351 pro vyhledávání: '"T. Petzel"'
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Crystal chemical study of the high-temperature phase R(O,F)1.93±δ with R=Tm, Yb and Lu
Autor: O. Greis, B. Hormann, J.-H. Müller, T. Petzel
Publikováno v: Journal of Alloys and Compounds. 278:165-168
The crystal chemistry of the non-stoichiometric compounds R(O,F)x with R=Tm, Yb, and Lu with x≈1.93±0.02, which are formed by peritectoid reaction of R2O3 with RF3 at ca. 900 K, ca. 950 K and 1076 K, respectively, has been studied by X-ray powder
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::514aa47e0d7714c7e12d5e6229568d72
https://doi.org/10.1016/s0925-8388(98)00586-6
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3
On the thermodynamics of the rhombohedral-cubic phase transition of thulium(III)oxide fluoride
Autor: T. Petzel, B. Hormann, J.-H. Müller
Publikováno v: Journal of Alloys and Compounds. 266:134-138
The rhombohedral(β)→cubic(α) phase transition of stoichiometric TmOF and the phase behaviour of samples of the analytical composition Tm(O,F)y with 1.85≤y≤2.10 were studied by quantitative differential thermal analysis (DTA) and by X-ray powd
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::24c35323a48632fc0c0ac71a625c40ea
https://doi.org/10.1016/s0925-8388(97)00497-0
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4
On the rhombohedral-cubic phase transition of solid solutions ROFCaF2 with RGd, Tb and Dy
Autor: T. Petzel, B. Hormann, J.-H. Müller, O. Andresen
Publikováno v: Journal of Alloys and Compounds. 259:208-211
The rhombohedral-cubic phase transition typical of stoichiometric rare earth oxide fluorides of the formula type ROF was investigated for the ROF-based solid solution systems R 1− x Ca x O 1+ x F 1+ x , with RGd, Tb, Dy, by differential scanning
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::209f80ac7cfae627c87cb8ef806d42af
https://doi.org/10.1016/s0925-8388(97)00093-5
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5
On the phase diagram of the binary system Sc2O3ScF3 in the temperature range 1400–1840 K
Autor: F. Schneider, B. Hormann, T. Petzel
Publikováno v: Thermochimica Acta. 276:1-6
The phase diagram of the binary system Sc 2 O 3 ScF 3 was investigated in the temperature range 1400–1840 K by quantitative differential thermal analysis (DTA). X-ray powder diffraction analysis revealed that at room temperature only the well-kn
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c22e9b5c106929cf1e2d6a4c86475a0c
https://doi.org/10.1016/0040-6031(95)02788-2
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6
High-temperature X-ray diffraction study of the rhombohedral-cubic phase transition of ROF with R=Y, La, Pr, Nd, SmEr
Autor: J.-H. Müller, T. Petzel
Publikováno v: Journal of Alloys and Compounds. 224:18-21
The rhombohedral-cubic phase transition of ROF with R=Y, La, Nd, SmEr and the expansion coefficients of both modifications were studied by the high-temperature Guinier X-ray powder diffraction method. It was found that a constant formula volume in
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::921d4fd9f3a2ff35982a07a2bd7f63f8
https://doi.org/10.1016/0925-8388(94)01509-0
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7
The crystal structure of the low-temperature A-type modification of Pr2O3 from X-ray powder and electron single crystal diffraction
Autor: R. Ziel, T. Petzel, Bernd Breidenstein, O. Greis, A. Haase
Publikováno v: Journal of Alloys and Compounds. 216:255-258
The crystal structure of A-Pr2O3 has been studied by X-ray powder diffraction and high-energy electron diffraction (HEED) from single crystals. The space group has been unambiguously established as P 3 m1 (No. 164) by HEED, though the intensities of
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f296c1d405f45b2e4c79b455720188b8
https://doi.org/10.1016/0925-8388(94)01265-j
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Thermodynamics of the rhombohedral-cubic phase transition of ROF with R  Y, La, Pr, Nd, SmEr
Autor: T. Petzel, V. Marx, B. Hormann
Publikováno v: Journal of Alloys and Compounds. 200:27-31
The temperatures and enthalpies of the rhombohedral-cubic phase transition of stoichiometric ROF with R  Y, La, Pr, Nd, SmEr, have been determined by differential scanning calorimetry. The temperatures of transition are found in the range 742
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::51a3867ae101f35b9d17a779e0647bc0
https://doi.org/10.1016/0925-8388(93)90466-z
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10
Crystal chemistry of the halite-related cation-deficient superstructure phase Yb7 + δSe8 with δ = 0.24 and its relation to YbSe
Autor: O. Greis, V. Marx, R. Ziel, T. Petzel
Publikováno v: Journal of Alloys and Compounds. 196:121-125
Systematic phase studies on the system YbSe-Yb2Se3 revealed besides the two terminal compounds three intermediate phases Yb0.91Se, Yb0.83Se and Yb0.75Se, all of them without significant phase width, which is characteristic for the so-called room temp
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::35747d9b48a6127bea0bccc4bf8f0259
https://doi.org/10.1016/0925-8388(93)90581-7
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