Mössbauer investigation of the thermal phase transition in RbMnFe(CN)6

He, Yan‐Ping; Tang, Guodong; Liang, Fu‐Pei; Huang, Yunhao; Mali, Huang

doi:10.1016/j.jallcom.2006.08.039

Cited by 7 publications

(2 citation statements)

References 33 publications

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“…LT Ͼ D HT , also well agrees with the x-ray diffraction data 20 which evidence a strong lattice contraction upon the HT to LT transformation. In addition, recent Mössbauer spectrometry studies 43,44 Ӎ 140 K, which are almost two times smaller than that of the present PBAs. This result can be explained by the strong covalent character of PBAs, while the SC materials are molecular crystals.…”

Section: Sound Velocity and Debye Temperaturecontrasting

confidence: 58%

Experimental access to elastic and thermodynamic properties of RbMnFe(CN)6

Boukheddaden

Loutete-Dangui

Codjovi

et al. 2011

Journal of Applied Physics

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We use spectroscopic ellipsometry to study the elastic and thermodynamic properties of the structural first-order transition of the cooperative Jahn–Teller solid, RbMn[Fe(CN)6]. While the analysis of the thermal dependence of the dielectric constant revealed a remarkable energy shift in the metal-to-ligand charge transfer band, that of the refractive index allowed to evaluate the volumetric thermal expansion coefficient in the two phases through the Gladstone–Dale relation. The access to the elastic properties of the solid is obtained with the reflectivity under pressure measurements, from which we estimated the bulk modulus values in the low- and high-temperature phases as BLT=30(±3) GPa and BHT=23(±2) GPa, respectively. Assuming the system is isotropic, the corresponding Debye temperature values have been found to be θDLT(SE)≃360(±25) K and θDHT(SE)≃290(±20) K, in good agreement with those derived from independent Mössbauer spectrometry investigations which led to θDLT(Moss)≃332(±7) K and θDHT(Moss)≃280(±11) K. Moreover, we have been able to extract from the SE data, the entropy change at the transition, ΔS≈64 J K−1 mol−1, which has been also found in good agreement with the value, ΔS≈60±5 J K−1 mol−1, derived from calorimetric experiments performed in this work.

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Section: Sound Velocity and Debye Temperaturecontrasting

confidence: 58%

Experimental access to elastic and thermodynamic properties of RbMnFe(CN)6

Boukheddaden

Loutete-Dangui

Codjovi

et al. 2011

Journal of Applied Physics

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show abstract

“…These evidences, typical for ferro/ferricyanides, suggest the presence of Fe(III) and Fe (II) nuclei in low-spin states (LS, S = 0). The d values (reported in Table S3 in the Supporting Information) are in agreement with the literature data for PBAs [40][41][42][43]. All the ferric doublets show a non-null D arising from the distortion in the local octahedral environment of the iron atoms that generate an asymmetry in charge distribution.…”

Section: Mössbauer Analysissupporting

confidence: 87%