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- Calucci , L. , Zimmermann , H. , Wachtel , E. J. , Poupko , R. and Luz , Z. 1997 . Liquid Crystals , 22 : 621 It may be mentioned that the authors of this paper state that contrary to earlier reports H3TP also shows a D h phase. In our optical microscopic studies we observed that on melting the substance shows a highly viscous phase with a texture similar to the D h phase which at a higher temperature undergoes another transition to the isotropic phase. However, simple “coverslip shear test” leads us to conclude that this intermediate phase is probably be a more ordered phase than even the plastic D phase of H4TP
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