The thermal decomposition of some tetraiodomercurates
TL;DR: In this article, the thermal decomposition of tetraiodomercurates of copper, silver, lead, mercury, thallium, and lead was studied on the thermal balance up to 1350°C.
Abstract: The thermal decomposition in air of the tetraiodomercurates of copper (I), silver (I), mercury (I), thallium (I), and lead (II) was studied on the thermal balance up to 1350°C. The thermal decomposition of the series falls into four classes: (1) for silver; decomposition to the metal; (2) for copper and lead: decomposition to the oxide; (3) for mercury: complete volatilization; and (4) for thallium: decomposition of the cationic metal to the iodide with subsequent volatilization. The thermochromic transition temperature of the thallium compound has been determined.
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TL;DR: In this article, the authors used a thermochromic material, cuprous mercuric iodide, to record an on-axis interference pattern, which was subsequently reduced in a two-step photographic process, and reconstruction was accomplished in the visible with He-Ne laser light.
Abstract: Infrared holography at 10.6 μm has been accomplished by using a thermochromic material, cuprous mercuric iodide, to record an on‐axis interference pattern. The pattern is subsequently reduced in a two‐step photographic process, and reconstruction is accomplished in the visible with He–Ne laser light.
27 citations
TL;DR: In this paper, four high pressure phases of silver mercury iodide, Ag 2 HgI 4, were studied to pressures of 75-100 kbar at 25°C.
Abstract: Silver mercury iodide, Ag 2 HgI 4 , has been studied to pressures of 75–100 kbar at 25°C. There are now four high pressure phases known. Transport studies indicate predominantly electronic conduction, with the highest pressure phase showing rectification in an asymmetric conductivity cell. Optical studies now corroborate the four high pressure phases. For two of the phases the energy gap shifts to lower energies with increasing pressure.
26 citations
TL;DR: The use of the photoacoustic effect in the investigation of first-and second-order phase transitions has been examined in this article, where changes in the amplitude of the signal across the phase transition are compared with changes in thermal properties such as specific heat and thermal diffusivity.
Abstract: The use of the photoacoustic effect in the investigation of first- and second-order phase transitions has been examined. Changes in the amplitude of the photoacoustic signal across the phase transition are compared with changes in thermal properties such as specific heat and thermal diffusivity. The systems studied include NaNO2, TlNO3, CsNO3, NH4NO3, BaTiO3, CoO, Cu2HgI4, VO2 and V3O5. The current photoacoustic studies are discussed in the light of the theoretical models available.
20 citations
TL;DR: In this article, the crystal structure of the δ phases comprises a slightly distorted h.c.p. anion sublattice with the two cation species dynamically disordered over the octahedral and tetrahedral interstices.
Abstract: The high temperature crystal structure of the superionic compounds Ag2HgI4 and Cu2HgI4 has been investigated using powder neutron diffraction. In addition to the widely studied β→α superionic transitions observed in both compounds just above ambient temperature, we have characterized the transitions to phases (labelled δ) in Ag2HgI4 and Cu2HgI4 which occur at ~410 and ~578 K, respectively. Prior to melting, Ag2HgI4 undergoes an additional transition at ~445 K to a phase labelled e. The crystal structure of the δ phases comprises a slightly distorted h.c.p. anion sublattice with the two cation species dynamically disordered over the octahedral and tetrahedral interstices. In e-Ag2HgI4 the cations are distributed over the tetrahedral and trigonal interstices formed by a b.c.c. anion sublattice and can, therefore, be considered to be a `cation-deficient' α-AgI-type superionic phase. The implications of these experimental findings in the wider context of the family of copper- and silver-based superionic conductors and for previous suggestions of `unusual' behaviour of the α↔δ transition are discussed.
16 citations
TL;DR: The thermal dissociation of 1-phenyl-3-methyl-4-(Xphenylhydrazo)-5-pyrazolone metal chelates [M(XPhHyPy)] was studied by TG, DTG and differential thermal analysis (DTA) as mentioned in this paper.
Abstract: The thermal dissociation of 1-phenyl-3-methyl-4-(X-phenylhydrazo)-5-pyrazolone metal chelates [M(XPhHyPy)](X=m-OH (I),m-OCH3(II),m-COOH (III),p-CH3 (IV),p-OCH3 (V) orp-COCH3 (VI) was studied by TG, DTG and differential thermal analysis (DTA). A rough sequence of thermal stability, obtained from the peak maximum temperatures, for the various metal chelates was Hg(II)
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