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A procedure for determining the transition temperatures of liquid crystals is described which is based on observation of the electrical conductivity as a function of temperature. It is found in particular that plotting the function d lg x/dT against the temperature gives a resolution and a sensitivity comparable to that of thermal methods of analysis (DTA and DSC). Dynamic orientation effects of the liquid crystals in the sample cell which usually lead to an increase in sensitivity are discussed. The phase diagram of the system 4,4ʹ-di-n-pentyloxy-azoxybenzene/4,4ʹ-di-n-heptyloxy-azoxybenzene determined using the electrical conductivity method is presented.

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Ein Verfahren zur Untersuchung von Phasenumwandlungen flüssiger Kristalle durch elektrische Leitfähigkeitsmessungen/ Investigation of Phase Transitions in Liquid Crystals by Means of Electrical Conductivity Measurements