2014
DOI: 10.1016/j.jfluchem.2014.10.016
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Heat capacity, entropy, dielectric properties and T–p phase diagram of (NH 4 ) 3 TiF 7

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Cited by 19 publications
(26 citation statements)
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“…Recently, studies of differential thermal analysis under pressure for some complex fluorides and oxyfluorides revealed the absence of the pressure effect, at least to 0.6 GPa, on the phase transition entropy [14][15][16]. Taking into account these results, we assumed that in the case of K 2 TaF 7 pressure also does not affect ∆S.…”
Section: Barocaloric Effectmentioning
confidence: 93%
“…Recently, studies of differential thermal analysis under pressure for some complex fluorides and oxyfluorides revealed the absence of the pressure effect, at least to 0.6 GPa, on the phase transition entropy [14][15][16]. Taking into account these results, we assumed that in the case of K 2 TaF 7 pressure also does not affect ∆S.…”
Section: Barocaloric Effectmentioning
confidence: 93%
“…The temperature stability of the initial tetragonal phase P4/mbm of (NH 4 ) 3 SiF 7 was examined by measurements with a DSM-10M differential scanning microcalorimeter (DSM). Recently it has been shown that among fluorides (NH 4 ) 3 M 4+ F 7 there are at least two crystals undergoing a phase transition into the cubic phase Pm3m above room temperature at ambient -(NH 4 ) 3 SnF 7 13 or high -(NH 4 ) 3 TiF 7 16 pressure.…”
Section: Calorimetric Investigationsmentioning
confidence: 99%
“…11 Moreover, some other fluoride double salts (NH 4 ) 3 M 4+ F 7 (M 4+ = Ti 4+ , Sn 4+ ) undergo phase transitions but of different sequences, and a correlation with the M 4+ ionic radius was found. [11][12][13][14][15][16] Therefore, one might expect the temperature variation would also destabilise the room temperature structure of the silicon double fluoride salt, leading to phase transitions.…”
Section: Introductionmentioning
confidence: 99%
“…An unusual succession of two structural phase transitions was observed upon heating and cooling P4/italicmbm3610.25emnormalKP4/italicmnc2930.25emnormalKitalicPatrue3¯. Maxima of the heat capacity peaks were located at the temperatures T 1 = 361 ± 2.0 K and T 2 = 293 ± 1.0 K. The sum of entropies associated with both phase transitions is rather large: ∑ΔS i = ΔS 1 + ΔS 2 = 32 ± 2 J/mol K . Individual values of entropy change in (NH 4 ) 3 TiF 7 differ from each other significantly: ΔS 1 = 9.2 ± 0.6 J/(mol K) (~Rln3), ΔS 2 = 22.7 ± 1.6 J/(mol K) (~Rln16).…”
Section: Introductionmentioning
confidence: 98%