Complex capacitance in the representation of modulus of the lithium niobate crystals

✍ Scribed by Mohammad A. Alim; A.K. Batra; Sudip Bhattacharjee; M.D. Aggarwal

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 335 KB
• Volume: 406
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2010.12.047

✦ Synopsis

The lithium niobate (LiNbO 3 or LN) single crystal is grown in-house. The ac small-signal electrical characterization is conducted over a temperature range 35 r Tr 150 1C as a function of measurement frequency (10 rf r 10 6 Hz). Meaningful observation is noted only in a narrow temperature range 59r T r73 1C. These electrical data when analyzed via complex plane formalisms revealed single semicircular relaxation both in the complex capacitance (C n ) and in the modulus (M n ) planes. The physical meaning of this kind of observation is obtained on identifying the relaxation type, and then incorporating respective equivalent circuit model. The simplistic non-blocking nature of the equivalent circuit model obtained via M n -plane is established as the lumped relaxation is identified in the C n -plane. The feature of the eventual equivalent circuit model allows non-blocking aspect for the LN crystal attributing to the presence of the operative dc conduction process. Identification of this leakage dc conduction via C n -plane is portrayed in the M n -plane where the blocking nature is removed. The interacting interpretation between these two complex planes is successfully presented.