Table 5
Crystal structures of Cesium Borates
Stoichiometry
Cs
l B
m H
n O
(l+3m+n)/
2
Name
Synth T(K)
Space group
Unit cell (Å or deg.)
X-ray T(K)
B-O (Å) ranges
Comments
l
m
n
Tetrahedral
Trigonal
Refs.
1
1
0
Cesium metaborate
R3̄ c
13.68, 8.36
[37]
R3̄ c
13.637, 8.365
1.301–1.418
[B
3 O
6 ]
3−
ions [85]
1
2
5
298
P21
̸ c
8.424,11.378,13.160,
92.06
298
1.439–1.516
1.361–1.379
[B
4 O
5 (OH)
4 ]
2−
ions [86]
3
7
0
993
C21
̸ c
59.911, 11.520.34.525,
101.052
293
1.42–1.52
1.32–1.42
3-layers, 9xsupercell [87]
1
3
0
Cesium triborate
1073
P212121
6.18,8.48,9.17
1.45–1.50
1.34–1.44
B
3 O
3 unit [88]
P212121
6.213,8.521,9.170
295
1.458–1.485
1.336–1.399
[89]
3
13
0
1003
C2
̸ c
23.064,13.367, 24.464,
90.281
298
1.39–1.56
1.33–1.43
B
3 O
3 and B
5 O
6
units [90]
1
5
8
298
P21
̸ c
11.584,7.174,13.959
94.61
1.46–1.49
1.33–1.40
[B
5 O
6 (OH)
4 ]
−
ions [91]
1
5
0
α-cesium
pentaborate
823
P21
̸ n
7.117,9.634,10.391
101.160
298
1.463–1.495
1.334–1.409
B
5 O
6 units [84]
α-HT
923
P21
̸ c
7.122,9.640,11.411
116.64
1.466–1.497
1.346–1.387
B
5 O
6 units [92]
γ-cesium
pentaborate
733
Pbca
8.697, 8.431,21.410
298
1.46–1.48
1.30–1.45
B
5 O
6 units [84]
1
9
0
Cesium
enneaborate
853
P2221
8.768,15.790
1.43–1.46
1.23–1.44
B
3 O
3 units [93]
118
C. C. Pye