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Thermal properties of polycrystalline $[Mn(NH_{3})_{6}](ClO_{4})_{2}$ : crystal structure and phase transitions

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Thermal properties of polycrystalline $[Mn(NH_{3})_{6}](ClO_{4})_{2}$ : crystal structure and phase transitions

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dc.contributor.author Hetmańczyk, Joanna [SAP11019446] pl
dc.contributor.author Hetmańczyk, Łukasz [SAP11018142] pl
dc.contributor.author Migdał-Mikuli, Anna [SAP11005097] pl
dc.contributor.author Mikuli, Edward [SAP11006218] pl
dc.date.accessioned 2015-06-12T07:43:58Z
dc.date.available 2015-06-12T07:43:58Z
dc.date.issued 2014 pl
dc.identifier.issn 1388-6150 pl
dc.identifier.uri http://ruj.uj.edu.pl/xmlui/handle/item/9496
dc.language eng pl
dc.rights Udzielam licencji. Uznanie autorstwa 4.0 Międzynarodowa *
dc.rights.uri http://creativecommons.org/licenses/by/4.0/pl/legalcode *
dc.title Thermal properties of polycrystalline $[Mn(NH_{3})_{6}](ClO_{4})_{2}$ : crystal structure and phase transitions pl
dc.type JournalArticle pl
dc.description.physical 1049-1056 pl
dc.identifier.weblink https://link.springer.com/content/pdf/10.1007%2Fs10973-014-3803-6.pdf pl
dc.abstract.en The X-ray powder diffraction (XRPD) pattern of [Mn(NH 3 ) 6 ](ClO 4 ) 2 at room temperature can be indexed in the regular (cubic) system (Fm 3m space group) with lattice cell parameter a = 11.5729 A ̊ and with four mole- cules per unit cell. The XRPD pattern at 100 K is evidently different, and it indicates lowering of the crystal structure. One phase transition at T h C1 = 143.5 K (on heating) and at T c C1 = 137.6 K (on cooling) was detected by DSC for [Mn(NH 3 ) 6 ](ClO 4 ) 2 in the range of 120–300 K. The fol- lowing thermodynamic parameters for phase I $ phase II transition were obtained: D H = 3.1 ± 0.2 kJ mol - 1 and D S = 21.6 ± 0.3 J mol - 1 K - 1 . The large value of entropy changes ( D S ) indicates considerable configurational disor- der in the high temperature phase. The presence of 5.9 K hysteresis of the phase transition temperature at T C and sharpness of the heat flow anomaly attest that the detected phase transition is of the first-order type. Appearing of the two new bands (splitting of d s (HNH) F 1u mode) in FT-MIR spectra at the vicinity of 1200 cm - 1 suggests that the phase transition undergoes a change of the crystal structure. pl
dc.subject.en hexaamminemanganese(II) perchlorate pl
dc.subject.en X-ray powder diffraction (XRPD) pl
dc.subject.en thermal decomposition (TG/DTG/QMS) pl
dc.subject.en FT-IR pl
dc.subject.en phase transition pl
dc.subject.en DSc pl
dc.description.volume 118 pl
dc.description.number 2 pl
dc.identifier.doi 10.1007/s10973-014-3803-6 pl
dc.identifier.eissn 1588-2926 pl
dc.title.journal Journal of Thermal Analysis and Calorimetry pl
dc.language.container eng pl
dc.date.accession 2018-07-12 pl
dc.affiliation Wydział Chemii : Zakład Fizyki Chemicznej pl
dc.affiliation Wydział Chemii : Zakład Dydaktyki Chemii pl
dc.subtype Article pl
dc.rights.original CC-BY; inne; ostateczna wersja wydawcy; w momencie opublikowania; 0 pl
dc.identifier.project ROD UJ / P pl
.pointsMNiSW [2014 A]: 25


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Udzielam licencji. Uznanie autorstwa 4.0 Międzynarodowa Except where otherwise noted, this item's license is described as Udzielam licencji. Uznanie autorstwa 4.0 Międzynarodowa