Table 1 The thermodynamic characterization of studied systems.

From: Pressure-induced liquid-liquid transition in a family of ionic materials

 

\({T}_{{{{{{\rm{LLT}}}}}}}^{{{{{{\rm{c}}}}}}}\)

−\({\triangle H}_{{{{{{\rm{LLT}}}}}}}^{{{{{{\rm{c}}}}}}}\)

\({T}_{{{{{{\rm{LLT}}}}}}}^{{{{{{\rm{h}}}}}}}\)

\({\triangle H}_{{{{{{\rm{LLT}}}}}}}^{{{{{{\rm{h}}}}}}}\)

Tg

TLL BDS

Tc

−ΔHc

Tm

ΔHm

ν

DN

Anion

K

J g−1

K

J g−1

K

K

K

J g−1

K

J g−1

nm3

kcal mol−1

[SCN]−

212.1*

211.6**

213.0***

213.3

16.6*

14.9**

12.9***

11.4

207.4*

206.2**

207.5***

207.1

16.6*

15.1**

13.2***

11.6

197.7a

199.1b

210.3

231.4*

234.2**

251.9***

254.3

38.0*

39.2**

9.51***

1.9

270.8*

267.4**

273.0***

272.3

58.2*

57.0**

18.1***

5.0

0.0405

0.048c

45.9

[BH4]−

213.8*

214.6**

214.7***

216.1

8.5*

6.4**

5.6***

4.6

206.0*

206.8**

207.3***

207.6

8.3*

6.7**

6.0***

5.0

198.5a

201.3b

210.9

222.5*

232.7**

242.3***

250.9

51.1*

59.6**

62.8***

34.5

270.7*

271.1**

270.4***

271.9

82.5*

77.4**

73.8***

34.6

0.03

0.046c

 

[BF4]−

–

–

–

–

–

–

270.0*

229.0

49.3*

21.9

295*

295

61.4*

61.7

0.079

0.07c

7.3

[TCM]−

206.7*

206.8**

207.1***

207.4

13.1*

12.3**

9.9***

8.1

203.7*

204.4**

204.6***

204.8

13.1*

12.0**

10.2***

8.6

197.7a

196.3b

203.6

–

–

–

–

0.121

0.093c

26.1

[TAU]−

214.9*

214.8**

215.8***

216.1

6.0*

4.8**

4.4***

3.8

201.6*

202.1**

203.3***

203.9

6.1*

4.7**

4.1***

3.9

197.5a

199.5b

206.5

–

–

–

–

0.098c

 

[BOB]−

213.4*

213.5**

214.5***

216.1

0.64*

0.51**

0.42***

0.38

202.2*

202.8**

203.7***

204.8

1.3*

1.2**

1.1***

0.8

202.1a

198.4b

–

–

–

–

–

0.174

0.164c

 

[TFSI]−

203.5*

204.3**

204.8***

205.6

8.6*

7.3**

6.5***

5.9

200.5*

200.4**

199.8***

200.1

9.7*

8.2**

7.1***

6.6

195.9a

194.2b

201.2

–

–

–

–

0.161

0.163c

11.2

  1. TLL and ΔH denote respectively the temperature and enthalpy of liquid–liquid transition determined during the cooling (c) and heating (h) scan.
  2. An increase of ΔHLLT with a decreased scanning rate indicates that phase 1 needs a certain amount of time to transfer to phase 2.
  3. Tg glass transition temperature, Tc crystallization temperature, Tm melting temperature, ΔHm enthalpy of melting, ΔHc enthalpy of crystallization, v molecular volume of anions.
  4. aThe glass transition temperature was determined from DSC measurements after 6 h aging at 183.15 K with the heating rate 10 K/min.
  5. bThe glass-transition temperature determined from BDS measurements according to definition Tg = T (σdc = 10−14 S/cm).
  6. *1 K/min; **2 K/min; ***5 K/min; Others: 10 K/min.
  7. cThe van der Waals volume was calculated by using the Bondi method.
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