Various experimental tools have been applied for the characterization of materials and evaluation of their functionalities.
Among them, thermodynamic methods are unique in the sense that the energetic and entropic aspects inherent in materials can
be directly observed. Physical quantities obtained from thermodynamic measurements reflect macroscopic aspects of materials.
However, because those quantities are closely related to the microscopic energy schemes of all kinds of molecular degrees of
freedom in a statistical manner, one can gain detailed knowledge on the microscopic level on the basis of precise thermodynamic
investigations. Among them, heat capacity calorimetry is an extremely useful tool to investigate thermal properties of
materials, in particular at low temperatures.
For correct understanding of functionality of materials, it is crucially important to complementarily adopt both spectroscopic
and/or structural methods leading to microscopic aspects of materials and thermodynamic methods revealing energetic
aspects. The aim of this thematic issue is to review calorimetric studies on functional inorganic materials to show the important
roles played by thermodynamic studies.
The topics picked up in Part II of this thematic issue are the following six functional materials:  Mixed-valence metal
complexes M(II)M(III)X (M = Pt, Ni) and  Mixed-valence metal complex Fe(II)Fe(III)(dto)3: Electron transfer between
the mixed-valence metal ions provide a variety of phase transitions in which the magnetic and electronic properties are dramatically
altered . Assembled bimetallic complex: By changing the bimetallic ions, various dimensional assemblies are established.
Some complexes exhibit dimensional crossover by temperature change. Dramatic changes in the magnetic and/or electronic
properties are sensitively reflected on thermodynamic quantities . Organic conductor (DMe-DCNQ)2Cu and 
Organic super conductors: The charge transfer complexes consisting of organic molecules and inorganic counter ions give
various metallic compounds. The electron correlations and electron-phonon coupling occuring in them produce a variety of
phase transitions such as metal-insulator, magnetic, and superconductive transitions. Thermodynamic information related to
low-energy excitations of itinerant electrons gives clue for understanding the mechanism of them . Relaxors: The relaxor is
characterized by a large, broad and frequency-dependent dielectric constant peak extending a wide temperature range. The giant
electromechanical response in ferroelectric relaxors is of great importance for a number of ultrasonic and medical applications
as well as in telecommunications. Papers concerning calorimetry of other functional materials will be published in the forthcoming
We would like to thank Prof. Yann Garcia, the Editor-in-Chief of Current Inorganic Chemistry, who invited us to edit a
thematic issue concerning calorimety of inorganic materials. We would like to acknowledge all the authors who accepted our
invitation to contribute to this thematic issue, as well as the reviewers who invested their valuable time to ensure the high scientific
quality of all contributions.