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- Info
Laboratory Facilities
Department of Chemistry & Biochemistry at BYU - Juliana Boerio-Goates - Publications
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Calorimeters
One traditionally gets at entropies by integrating the heat capacity as  .
We measure the heat capacity to temperatures as low as 0.6 K in one
cryostat and have three others for work at higher temperatures. Three
of the four are home-built calorimeters that have an accuracy and
precision comparable to the best available in the world. The
low-temperature semi-adiabatic apparatus operates from 0.5 # T/K #
100. In this region solid-state phenomena such as magnetic transitions,
superconductivity, charge and spin-density waves, take place. We have
two calorimeters, one just developed, that cover the temperature range
from 10 # T/K #
400. The high accuracy of this instrument up to 400 K allows accurate
enthalpy increments and third-law entropies to be calculated. These
apparati are used to study solid-state phenomena of interest
(structural and magnetic phase transitions, for example) between 30 # T/K #
400. For higher temperature work, we have a Netsch differential
scanning calorimeter (DSC) that is capable of measurements up to 800 K,
on small samples (few mg) but with reduced accuracy and precision. In
some problems, we combine results from all three types of calorimeters.
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| Low Temperature Calorimeter |
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Synthetic Facilities
We
have a variety of furnaces available for doing classical “beat and
heat” synthesis and single crystal growth, and we can also do sol-gel
and hydrothermal techniques for nanoparticle synthesis. Air and/or
water sensitive samples are handled in a large Ar-filled glove box in
which the water and oxygen contents are kept below 1 ppm.
Sample Characterization Facilities
BYU
is well-equipped to do modern materials characterization. In 2004
alone, two new Transmission Electron Microscopes (TEM) and a new X-ray
Diffractometer (XRD) capable of temperature dependent single crystal
structure refinements were purchased. Our group makes use of
thermogravimetry (TG), X-ray fluorescence (XRF), electron microprobe,
photoelectron spectroscopy (PES), visible, infrared and Raman
spectroscopies as appropriate for a particular problem.
Brunnaeuer-Emmet-Teller (BET) measurements for particle surface area
measurements are usually done at U.C. Davis. |
| Intermediate Temperature Calorimeter |
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