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Crystal growth and characterization of Haldane chain compound Ni(C3H10N2)2NO2ClO4

Authors
Journal
Journal of Crystal Growth
0022-0248
Publisher
Elsevier
Publication Date
Volume
327
Issue
1
Identifiers
DOI: 10.1016/j.jcrysgro.2011.05.013
Keywords
  • A1. X-Ray Diffraction
  • A1. Solvents
  • A2. Growth Temperature
  • B2. Magnetic Materials

Abstract

Abstract The bulk single crystals of S=1 chain compound Ni(C 3H 10N 2) 2NO 2ClO 4 are grown by using a slow evaporation method at a constant temperature and a slow cooling method. It is found that the optimum condition of growing large crystals is via slow evaporation at 25 °C using 0.015 mol Ni ( ClO 4 ) 2 · 6 H 2 O , 0.015 mol NaNO 2, and 0.03 mol 1,3-propanediamine liquid dissolved into 30 ml aqueous solvent. High-quality crystals with size up to 18 × 7.5 × 5 mm 3 are obtained. The single crystals are characterized by measurements of X-ray diffraction, magnetic susceptibility, specific heat and thermal conductivity. The susceptibilities along three crystallographic axes are found to exhibit broad peaks at ∼ 55 K , and then decrease abruptly to zero at lower temperatures, which is a characteristic of a Haldane chain system. The specific heat and the thermal conductivity along the c-axis can be attributed to the simple phononic contribution and are analyzed using the Debye approximation.

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