Articles you may be interested inSynergic effect of carbon black and short carbon fiber on shape memory polymer actuation by electricity J. Appl. Phys.Mechanisms of spin localization in graphitic nanoparticles of activated carbon fibers ͑ACFs͒ are discussed. Electronic properties of ACFs are described by the model which is the fusion of two approaches: Langevin paramagnetism represented by Curie law in electron paramagnetic resonance measurements and granular metal model used to describe conducting properties of separated fibers according to metal-insulator transition. This approach shows the possibility of changing the electronic properties of ACFs by temperature or adsorbed molecules as a main factors.

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The problem proton-glass and ferroelectric phases coexistence in Rb 1−x (NH 4 ) x H 2 AsO 4 (RADA) and K 1−x (NH 4 ) x H 2 PO 4 (KADP) crystals based on dielectric studies up to temperature 0.3 K is presented. The measurements were performed in the helium-3 cryostat in the temperature range from 300 K to 0.3 K. Glass behavior for the RADA is present even for a small concentration x = 0.01, whereas for the KADP the proton glass occurs for a concentration x > 0.05. The partial phase diagrams of RADP and KADP as a function of fractional ammonium concentration x and temperature T are presented.