Yin, "Compositional homogeneity and electrical properties of lead magnesium niobate titanate single crystals grown by a modified bridgman technique," Japanese Journal of Applied Physics, vol.
Li, "Growth and electrical properties of large size Pb(In1/2Nb1/2)O-3-Pb(Mg1/3Nb2/3)O-3-PbTiO3 crystals prepared by the vertical Bridgman technique," Applied Physics Letters, vol.
For purification, the crystal was grown by the Bridgman technique three times.
TlBr crystals were grown by the vertical Bridgman technique, using quartz tubes as crucibles in vacuum atmosphere.
Due to the experimental particularities of the Bridgman purification used in this work, the following requirements mentioned previously are not established: (1st) in the crystal growth by the Bridgman technique, the raw material needs to be fully melted previously, which is in divergence with the hypothesis number (v); (2nd) in order to promote the nucleation, the growth crucible should be, preferably, cone-shaped, disregarding the hypothesis number (ii); (3th) due to the methodology applied, at each full melting, a fraction of the impurities, located in the top region, can recirculate by the Brownian movement, thereby reducing the efficiency of purification.
The TlBr resistivity above ~3 MQ was almost unaffected by the number of repetitions when growing crystals by Bridgman technique.