Neutron Diffraction Study of the Compressibility of TTF-TCNQ and KCP under Hydrostatic Pressures up to about 20 kbar
The organic charge-transfer salt TTF-TCNQ (tetrathiafulvalene-tetracyanoquinodimethane) and the Krogmann salt KCP [K2Pt(CN)4Br0.3.3H2O] have been the focus of considerable recent work because of their unusual quasi-one dimensional electronic transport properties and, in case of TTF-TCNQ, its sequence of Peierls and collective phase transitions at low temperatures. We have measured the linear axial compressibilities of deuterated polycrystalline samples of these two compounds under purely hydrostatic pressures up to about 20 kbar by neutron diffraction measurements at room temperature. The high-pressure cell is a piston-cylinder device and a liquid is used as the pressure transmitting medium. The pressure is monitored by a manganin pressure gauge placed directly in the transmitting liquid and calibrated previously by reference to the NaCl pressure scale.
KeywordsNeutron Diffraction Neutron Diffraction Study Chain Axis Neutron Diffraction Measurement Large Lattice Parameter
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