Abstract
An improved form of the interferometric dilatometer of Childs and Weintroub is described briefly and shown diagrammatically. The expansion and temperature fringes are recorded simultaneously and automatically by means of photomultipliers. The interferometer plates are coated with reflecting films and the dilatometer is suitable for crystals of approximately 2 cm length. The thermal expansions of two tin single crystals of orientations ? = 8 and 65.5? were recorded over the temperature range 30-180?C, and of seven indium single crystals, ? = 7-82?, over the range 30-120?C. The linear expansion coefficients ?? were calculated from the records and the two principal coefficients ?|| and ?? corresponding to ? = 0 and 90? were then found by extrapolation. For indium, ?|| and ?? change steadily from -7.5 and 50.0 ? 10-6/deg C at 30?C to -29.0 and 72.5 ? 10-6/deg C at 120?C respectively. The errors in ?|| and ?? are estimated to be not greater than 5 and 1% respectively. The results are exhibited in graphical and tabular form. The single crystals were grown by the method of slow solidification from the melt.
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