Liquid nitrogen cryostat for the low-temperature Mössbauer spectra measurements

Abstract

Abstract. In materials research, especially in the case of nanomaterials, the option of performing the low-temperature Mössbauer spectroscopy measurements is very desirable. For this purpose, a new design of low-temperature Mössbauer spectrometer, working in the transmission mode, is introduced. The main part of the presented device is composed of a cryostat (Dewar flask). The next part of the cryostat includes a vacuum chamber with the sample holder connected to the Dewar flask by a heat conducting rod and Mössbauer spectrometer attached onto cryostat. The measurements are performed at a temperature of liquid nitrogen, i.e., 77 K. The price and maintenance of the cryostat is very low acquired with very easy and useful environment for the operator.

Design and thermal modeling of a cold finger open cycle cryostat for Mössbauer spectroscopy

“…The individual evaporation time of each disk of liquid nitrogen was calculated by dividing the evaporation heat required to evaporate the volume ΔV of the disk by the sum of variable heat flows and constant heat flows for the height of that specific disk, as presented in Eq. (6).…”

“…Commercial cryostats are expensive systems, being the cost of simpler configurations around USD 30,000. Although some designs of cryostats developed specifically for Mössbauer spectroscopy have been reported in literature [5,6], more effort is necessary to develop a thermal model that allows to address an optimized design of this system, in order to minimize the thermal loads of the cryogenic substance, as well as obtaining Mössbauer spectra of good quality. The need to implement a low cost cryostat for the Mössbauer spectrometer of the Universidad EAFIT in Medellín, Colombia, motivated us to perform the design and construction of a prototype adapted to our particular requirements.…”

Magnetic ground state of nanosized β-Fe2O3and its remarkable electronic features

“…[38][39][40] The values of the isomer shi are attributed to a-Fe at room temperature. [38][39][40] The values of the isomer shi are attributed to a-Fe at room temperature.…”