Autor: TOMASZEWSKI, P.E. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Wzór Scherrera : stulecie błędnych praktyk
Scherrer formula : the century of erroneous practices
Autorzy:: Tomaszewski, P. E.
Powiązania:: https://bibliotekanauki.pl/articles/172133.pdf
Data publikacji:: 2013
Wydawca:: Polskie Towarzystwo Chemiczne
Tematy:: Wzór Scherrera
nanomateriały
badania dyfrakcyjne
rozmiar krystalitów
Scherrer's formula
nanomaterials
diffraction studies
grain size
Opis:: We present the sources of uncertainty in the evaluation of grain size in nanomaterial. The calculations are made for the same diffraction pattern using Scherrer and Williamson-Hall methods. As an example we use the CoCr₂O₄ nanocrystal. The comparison of results from different calculations, methods and programs is made just to show how important is the (correct) choice of a method and its internal parameters. The data from well known Scherrer formula, show that the difference in obtained results exceeds 100% up to even about 350%. This indicates that in any case the Scherrer formula could not give the correct and reliable value for crystallite size. As a consequence, the wide use of this formula is a great error providing the incorrect results.
Źródło:: Wiadomości Chemiczne; 2013, 67, 9-10; 929-942
0043-5104
2300-0295
Pojawia się w:: Wiadomości Chemiczne
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: X-ray Study of Ferroelectric Phase Transition in (NH(CH$\text{}_{3}$)$\text{}_{3}$)$\text{}_{3}$Sb$\text{}_{2}$Cl$\text{}_{9}$
Autorzy:: Tomaszewski, P. E.
Powiązania:: https://bibliotekanauki.pl/articles/1932124.pdf
Data publikacji:: 1995-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 64.70.Kb
61.50.Ks
77.80.Bh
65.70.+y
Opis:: The lattice parameters of a title crystal, TMACA, were measured from a room temperature to 405 K by the X-ray single-crystal Bond method. The high-temperature paraelectric phase should have the monoclinic symmetry (space group P2/c). Some peculiarities on dielectric behaviour of the crystal were explained. The hypotheses on incommensurability of the paraelectric phase as well as on the parent normal (trigonal) phase were presented.
Źródło:: Acta Physica Polonica A; 1995, 87, 3; 631-634
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Specific Heat of (NH$\text{}_{2}$(CH$\text{}_{3}$)$\text{}_{2}$)$\text{}_{3}$Bi$\text{}_{2}$I$\text{}_{9}$
Autorzy:: Plackowski, T.
Włosewicz, D.
Tomaszewski, P. E.
Baran, J.
Marchewka, M. K.
Powiązania:: https://bibliotekanauki.pl/articles/1932127.pdf
Data publikacji:: 1995-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 64.70.Kb
65.40.-f
Opis:: The specific heat of title compound was measured by adiabatic calorimeter in the temperature range 80-315 K. The phase transitions at about 304, 285 and 235 K were confirmed. A new structural phase transition at about 125 K was observed as well as new anomaly on differential scanning calorimetry (DSC) curve at about 318 K. The peculiar multiple character of C, anomalies may be explained in terms of phase transitions or intermediate phases induced by impurities. The specific heat data are in agreement with the independent DSC measurements and with preliminary X-ray studies.
Źródło:: Acta Physica Polonica A; 1995, 87, 3; 635-641
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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