Specific heat garnets

Cl = lattice specific heat Cm = magnetic specific heat Cn = nuclear specific heat C, = specific heat in garnet D = crystal field tensor of the ion... 

Specific heat in garnets has been analyzed theoretically (Harris and Meyer, 1962). It can be expressed by... 

Specific heat measurement is an effective method of obtaining the Debye temperature, do, but it is affected by impurities in the samples. In the case of YIG where many samples were used by different workers, the as obtained from the Cy data, varies from 572 to 538 K. A list of the Debye temperatures of several garnets is given in table 29.26, with some of the 6d values obtained from elastic constant measurements (Oliver et al., 1969a). 

Yttrium aluminum garnet (YAG) doped with trivalent cerium was synthesized by Lu et al. (2002) from nitrate salts of yttrium, cerium and aluminum, as also polyvinyl alcohol and urea. A sol was obtained by homogenization at 100°C for 2 h heating at 250°C for 2 h yielded a yellow gel. Calcination of the gel at 800-1100°C for 4 h produced phase-pure nano- or micrometer-size powders ofYAG Ce +. Under specific conditions of preparation, the particles could be as small as 20 nm. 

---