Research Article

Dielectric Properties of Rhombohedral

Table 3

Calculated activation energy using the empirical formula exp( / ) = = , where is the activation energy, is the  eV· , and is the . Values of and for different measuring frequencies and temperatures ranges have been given in (a) 50 to 520°C and (b) 540 to 700°C.
(a)

Frequency (Hz)Temperature range
(50 to 380°C)(380 to 420°C)(420 to 520°C)
(meV)    Ω·m (meV)    Ω·m (meV)    Ω·m

1 k766.7119.81910.42223.8
5 k715.164.91795.8401.2
10 k704.162.31727.0144.7
30 k644.229.21597.721.8
50 k101.612.29610.219.61519.47.26
500 k17.9615.37272.50.2391094.20.023
1 M9.0749.02122.40.046872.60.001
2 M75.4525.22503.013.91188.50.145
3 M1196.21.85 M1276.00.642
4 M570.463.31153.80.124

(b)

Frequency (Hz)Temperature range
(540 to 565°C)(565 to 650°C)(675 to 700°C)
(meV)    Ω·m (meV)    Ω·m (meV)    Ω·m

1 k829.6303.6324.00.273−915.459.7
5 k830.6309.4322.90.270−904.268.9
10 k830.6310.5320.90.264−897.674.9
30 k824.3319.3316.10.250−889.383.6
50 k813.0248.3311.60.238−878.396.2
500 k610.319.9224.30.093−795.3308.5
1 M525.47.84171.20.059−741.0736.4
2 M554.212.8161.30.056−839.9233.6
3 M561.817.0145.70.054−885.5156.6
4 M561.020.5131.80.055−890.9176.2
5 M588.035.6123.30.059−916.2152.7