Heat Capacities and Thermodynamic Properties of Pinnoite and Inderite
Table 2
The molar heat capacities of pinnoite and inderite at 306.15∼355.15 Ka.
T (K)
Cp,m (J·mol−1·K−1)
T (K)
Cp,m (J·mol−1 K−1)
T (K)
Cp,m (J·mol−1 K−1)
Pinnoite, MgB2 O4 ·3H2 O
306.15
154.85
323.15
169.84
340.15
181.16
307.15
155.94
324.15
170.55
341.15
181.66
308.15
157.45
325.15
171.22
342.15
182.19
309.15
158.71
326.15
171.93
343.15
182.68
310.15
159.85
327.15
172.60
344.15
183.16
311.15
160.76
328.15
173.30
345.15
183.63
312.15
161.68
329.15
173.96
346.15
184.09
313.15
162.60
330.15
174.65
347.15
184.53
314.15
163.39
331.15
175.37
348.15
184.96
315.15
164.14
332.15
176.07
349.15
185.40
316.15
164.88
333.15
176.80
350.15
185.86
317.15
165.52
334.15
177.57
351.15
186.34
318.15
166.17
335.15
178.27
352.15
186.86
319.15
166.84
336.15
178.91
353.15
187.43
320.15
167.57
337.15
179.53
354.15
188.04
321.15
168.32
338.15
180.09
355.15
188.70
322.15
169.07
339.15
180.63
Inderite, Mg2B6O11·15H2O
306.15
474.94
323.15
521.82
340.15
560.43
307.15
479.69
324.15
524.12
341.15
562.89
308.15
484.73
325.15
526.36
342.15
565.29
309.15
488.20
326.15
528.59
343.15
567.98
310.15
490.94
327.15
530.77
344.15
570.78
311.15
493.51
328.15
533.01
345.15
573.30
312.15
495.98
329.15
535.19
346.15
576.09
313.15
498.44
330.15
537.38
347.15
578.95
314.15
500.45
331.15
539.50
348.15
581.91
315.15
502.52
332.15
541.57
349.15
584.65
316.15
504.70
333.15
543.75
350.15
587.56
317.15
506.89
334.15
545.82
351.15
590.97
318.15
509.24
335.15
548.06
352.15
595.06
319.15
511.70
336.15
550.52
353.15
600.09
320.15
514.21
337.15
552.93
354.15
605.63
321.15
516.73
338.15
555.50
355.15
611.12
322.15
519.25
339.15
557.97
aThe sample weights for pinnoite and inderite were 15.92 and 15.27 mg, respectively. The temperature heating rate was 2 K·min−1. The standard uncertainty u is u (Cp,m) = 0.05 J·mol−1·K−1.
