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IR and NMR Spectra of Crystalline and Amorphous Copper Metaborate

“…The assumption on changes in the Cu-O-B-O-Cu exchange bridge during amorphyzation of CuB 2 O 4 was made in [3]. In the present work it is demonstrated using the IR and NMR methods that these changes occur during amorphyzation.…”

“…Among the problems of elucidation of the influence of amorphyzation on the CuB 2 O 4 magnetic properties are an increase in the paramagnetic Curie temperature (Θ ⊥ = -23 K and Θ || = -17 K for crystalline CuB 2 O 4 and Θ = -56 K for amorphous CuB 2 O 4 ) and anomalous temperature dependences of the susceptibility and resonant characteristics [3].…”

“…The congruent character of melting of CuGeO 3 , Bi 2 CuO 4 , and CuB 2 O 4 oxocuprites and the presence of classical B 2 O 3 and conditional GeO 2 and Bi 2 O 3 glassformers in these compounds give a unique opportunity to translate these compounds into the amorphous state and to investigate the influence of amorphyzation on the magnetic properties of the substance comparing these properties in crystalline and amorphous states [1][2][3].…”

“…The magnetic and resonant properties of crystalline and amorphous CuB 2 O 4 were measured in [3]. Amorphyzation significantly changed the magnetic properties of copper metaborate.…”

“…Exchange interactions between Cu 2+ ions (S = 1/2) in CuB 2 O 4 crystal are realized through the long Cu-O-B-O-Cu bridges incorporating boron ions [3]. Copper cations in CuB 2 O 4 occupy two nonequivalent positions.…”