Sirdeshmukh / Subhadra Micro- and Macro-Properties of Solids

Thermal, Mechanical and Dielectric Properties
1. Auflage 2006
ISBN: 978-3-540-31786-9
Verlag: Springer
Format: PDF
Kopierschutz: 1 - PDF Watermark

E-Book, Englisch, Band 80, 404 Seiten, eBook

Reihe: Springer Series in Materials Science

Each of the eight chapters treats an important aspect of solid state physics, comprising a complete review of the particular field. Typically, a chapter starts with basic information about a property of a solid and the related experimental techniques. This is followed by a global overview which brings together all important contributions by different research workers in the field. This overview is comprehensive and covers essential literature over the past 60 years. Each chapter concludes with a detailed discussion of the contributions made by the chapter authors and their associates, in some cases spanning the last 45 years. In addition, Micro- and Macro-Properties of Solids provides data on new materials such as rare-earth metals, semiconductors, ferroelectrics, mixed-valence compounds, superionic conductors, optical and optoelectronic materials and biomaterials.

Zielgruppe

Research

Autoren/Hrsg.

Sirdeshmukh, Dinker B.

Sirdeshmukh, Dinker

Sirdeshmukh, Lalitha

Subhadra, K. G.

Inhaltsverzeichnis

Lattice Constant – A Solid State Probe.- Thermal Expansion.- Debye–Waller Factors of Crystals.- Hardness.- Dielectric and Electrical Properties of Solids.- Theoretical Evaluation of Some Crystal Properties.- The Physics of Mixed Crystals.- Elastic Properties of Solids – A Critical Analysis.

Leseproben

2.2.5 Dilatometric Methods (p. 42-43)

Push-rod dilatometry is one of the techniques of measurement of thermal expansion. Several push-rod dilatometers are commercially available. Fused quartz dilatometers are simple and comparatively inexpensive. In a typical dilatometer the sample is enclosed in a fused quartz tube. The end of the sample is in contact with a sensitive dial-gauge. The composite holder (quartz tube and sample) is placed in a heater and length changes are directly read on the dial-gauge. Janson and Sjoblom [2.42] describe such a dilatometer. A push-rod dilatometer was constructed and was used by Rao [2.43] for studies of some crystals. The instrument is described in some detail since it is simple in design, inexpensive and made from indigenously available components. The main parts of the push-rod dilatometer and the procedure for its use are discussed in this section.

The Push-Rod Assembly

The rods used in the present experimental set-up are made of fused silica. They are cylindrical in shape and their surface is satin-glazed. The rod assembly is made up of two parts. Three rods of equal length form the base of the assembly and a set of four short rods makes its upper part. The three base rods rest on two metal stands fixed to a wooden base. The metal stands are provided with horizontal projections on either side. The two projections facing each other have three grooves made in each of them to hold the rods. The exterior projections are flat so as to support the dial-gauge micrometers.

The rod assembly as seen from the front is shown in Fig. 2.1a (not included in the extract). The long rod, designated BR is one of the base rods fixed to the metal stands. The two shorter rods placed on the base rods rest lengthwise in the space provided by the adjacent base rods. The sample is sandwiched between the two short rods wherein the rod marked FR is the fixed rod and MR the movable rod. The shaded portion marked S shows the position of the sample.

The movable rod MR is in communication with the dial-gauge DG. The position of the heater is shown in the figure by H. The differential arrangement of the rod assembly, along with the positions of the specimen and the standard reference material, as seen from above is presented in Fig. 2.1b (not included in the extract). ,The shaded portions, S1 and S2, represent the two specimens, i.e., the sample and the standard reference material. FR1 and FR2 are the two fixed short rods, fixed to the base rods by means of an adhesive applied at the end away from the heater. MR1 and MR2 are the two movable rods which are in communication with the two dial-gauge indicators DG1 and DG2 kept on the two exterior projections of the metal stand.

The position of the heater with respect to the two samples is shown by H. When heated, the specimen under study communicates its dilation to the micrometer kept on the metal stand on one side of the assembly while the standard reference material communicates its dilation to the micrometer on the other side. The positions of the two thermocouples, T1 and T2 are as shown in the figure.

Über Autor(innen)

D.B. Sirdeshmukh taught physics for nearly four decades, first at Osmania University and later at Kakatiya University, Warangal. He was Fulbright Visiting Professor at the University of Rhode Island, USA, and has been Emeritus Professor at the Kakatiya University. Prof. Sirdeshmukh is actively engaged in research for close to 50 years in several branches of Solid State Physics. He has authored about 120 research publications including two review articles in Journal of Materials Science. He has authored two books.L. Sirdeshmukh was educated at the Osmania University and earned a Ph.D in Spectroscopy. She taught physics for more than three decades at the Kakatiya University. Her research interests are in spectroscopy and dielectric properties of materials. She has published about 80 papers and she was the guest editor of a special issue of the Bulletin of Materials Science. She co-authored a book with Prof. Sirdeshmukh.K.G. Subhadra has been teaching physics at the Kakatiya University for over three decades. Her research interests are in X-ray crystallography and mechanical properties of solids. She has published about fifty papers and has co-authored two books with Prof. D.B. Sirdeshmukh. She has participated in a number of conferences and 3 of her papers were chosen for best presentation awards.