The Physical Properties of Cuprous Sulfides-Semiconductors

Hirahara, Eiji

doi:10.1143/jpsj.6.422

Cited by 75 publications

(26 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…25 It has been indicated that the Dg phase is a superionic phase having liquid-like mobile copper ions. 26 The TE properties of p-type Cu 1.8 S were reported by Ge et al 10 Polycrystalline samples of the αDg form were synthesized by using a combined process of mechanical alloying (MA) and pulsed electric current sintering (spark plasma sintering: SPS). The high impact force generated between the milling balls during the MA process and the high cooling rate after the process made the αDg structure more stable.…”

Section: B Digenite and Chalcocite (P-type)mentioning

confidence: 92%

Research Update: Cu–S based synthetic minerals as efficient thermoelectric materials at medium temperatures

2016

View full text Add to dashboard Cite

Synthetic minerals and related systems based on Cu–S are attractive thermoelectric (TE) materials because of their environmentally benign characters and high figures of merit at around 700 K. This overview features the current examples including kesterite, binary copper sulfides, tetrahedrite, colusite, and chalcopyrite, with emphasis on their crystal structures and TE properties. This survey highlights the superior electronic properties in the p-type materials as well as the close relationship between crystal structures and thermophysical properties. We discuss the mechanisms of high power factor and low lattice thermal conductivity, approaching higher TE performances for the Cu–S based materials.

show abstract

Section: B Digenite and Chalcocite (P-type)mentioning

confidence: 92%

Research Update: Cu–S based synthetic minerals as efficient thermoelectric materials at medium temperatures

2016

View full text Add to dashboard Cite

show abstract

“…The first detailed study of the electrical and thermal behavior of cuprous sulfide was published in 1947 by E. Hirahara . This researcher reported the existence of three polymorphic phases of Cu 2 S with very different electrical behavior, namely the α phase below 110 °C, the β phase between 110 °C and 470 °C, and the γ phase at higher temperatures. Interestingly, E. Hirahara showed that the β phase is prone to a sizable ionic conductivity that is significantly reduced in the α phase.…”

Section: The (Long) History Of Copper Sulfides/selenides As Thermoelementioning

confidence: 99%

Are Binary Copper Sulfides/Selenides Really New and Promising Thermoelectric Materials?

Dennler

Chmielowski

Jacob

et al. 2014

Advanced Energy Materials

249

185

View full text Add to dashboard Cite

weighted by cyclical constrains. Furthermore, the approach proposed by Schumpeter embodies another fundamental idea, which is the competition between innovators. Indeed, these players pursue the monopoly rents that accrue to new proprietary technologies, and, as such, intend to be the fi rst to fi nd the right solution to the right problem at the right moment. Economists have been studying the relationship between innovation and competition for many years, trying to understand more specifi cally whether competition fosters innovation or not. As a matter of fact, some concluded on a negative infl uence of competition upon innovation and some on a positive effect. [ 2,5 ] But it appears that many economists and marketers converge toward the idea that the innovation versus competition curve shows an inverted U shape. [ 6 ] In other words some competition is constructive, yet aggressive competition tends to hamper the innovation process.It is interesting to place in this context the concept of duplication. Historians and sociologist often refer to multiple discoveries for cases in which similar discoveries are made simultaneously by scientists working independently from each other. [ 7 ] The wide literature of scientifi c discovery can be classifi ed into three basic categories: [ 8 ] the genius model, [ 9 ] the model based on chance, [ 10 ] and the model relying on cultural maturation. [ 11 ] The latter type, which is the more prone to multiplicity, suggests that the contributions of individual researcher are epiphenomenal. This school of thought advocates the infl uence of social determinism and zeitgeist. [ 12 ] As a consequence, it proposes that the change in science is strongly infl uenced by cultural priorities and research programs. [ 8 ] This very type of duplication can be considered benefi cial for society as a higher number of independent experiments does maximize the probability of the accuracy and the reality of a given discovery. [ 11 ] This point of view is easily applicable to paradigm shifting, major discoveries, especially if they occurred before the era of easily accessible information via the internet, gigantic centralized databases, and ultrafast search engines. However, nowadays it may appear obvious that the replication of the effort to generate innovation is socially suboptimal and reduces the overall return on investment for entities that fi nance research. None of the studies mentioned above accounts for that phenomenon because of the diffi culty to quantify modern duplication. Thus, despite its acknowledged relevance [ 13 ] and occurrence, the share and infl uence of modern duplication in academic and industrial research remains largely underexplored. The European Patent Offi ce (EPO) affi rms that "up to 30% of all expenditure in R&D is wasted on redeveloping existing Copper sulfi des and copper selenides have recently been reported as new and promising low-cost and environmentally friendly thermoelectric materials. Here, it is shown that these materials have actually been studied for mo...

show abstract

“…Copper sulfide has been extensively studied (conductivity [17][18][19], structure [20][21][22][23][24][25][26][27][28][29][30], band structure [13][14][15], phase diagram [25,[31][32][33][34], thermodynamic properties [10-12, 26, 33, 35], electrochemistry [16,36,37]). …”

Section: Introductionmentioning

confidence: 99%

Copper diffusion in copper sulfide: a systematic study

Cassaignon

Pauporté

Guillemoles

et al. 1998

Ionics

View full text Add to dashboard Cite

Abstract.Copper sulfide Cu2_xS is a model mineral for chalcogenides because of the existence of a non-stoichiometric compounds series in the range Cu2S -CuS in which properties change with x. For this reason, we have studied the influence of the mineral composition on the diffusion in this solid.Electrochemical Impedance Spectroscopy (EIS) applied to CU2_xS/cupric sulfate electrolyte was the main investigation technique. It enabled us to work at the equilibrium potential at which the composition is fixed and known. Changing the composition by electrochemically removing (or adding) a known amount of Cu, we were able to determine the chemical diffusion coefficient of copper in the composition range (from x = 0 to 0.066). In this work, we present the results obtained in the chalcocite and djurleite phases. These results were compared to other values reported in the literature. From this systematic study we discuss various diffusion mechanisms. Our observations support that in chalcocite and djurleite Cu diffuses via a vacancy mechanism.

show abstract

The Physical Properties of Cuprous Sulfides-Semiconductors

Cited by 75 publications

References 5 publications

Research Update: Cu–S based synthetic minerals as efficient thermoelectric materials at medium temperatures

Research Update: Cu–S based synthetic minerals as efficient thermoelectric materials at medium temperatures

Are Binary Copper Sulfides/Selenides Really New and Promising Thermoelectric Materials?

Copper diffusion in copper sulfide: a systematic study

Contact Info

Product

Resources

About