Solid State Physics Laboratory

About: Solid State Physics Laboratory is a facility organization based out in Delhi, India. It is known for research contribution in the topics: Quantum dot & Dielectric. The organization has 1754 authors who have published 2597 publications receiving 50601 citations.

Effect of metal oxide sensing layers on the distinct detection of ammonia using surface acoustic wave (SAW) sensors

Abstract: In the present work, SAW sensors coated with various metal oxides as sensitive layer have been exploited for distinct detection of ammonia. Thin films of different metal oxides (ZnO, SnO 2 , TeO 2 and TiO 2 ) of same thickness (40 nm) were deposited under optimized parameters using rf sputtering technique for selective detection of liquor ammonia. As deposited ZnO thin film was highly c -axis oriented, whereas SnO 2 thin film was polycrystalline. However the coatings of TiO 2 and TeO 2 thin films were amorphous. SAW sensor coated with ZnO film (ZnO/SAW) was found to be highly sensitive towards liquor ammonia as compared to other metal oxide coated SAW sensors. Effect of the thickness of ZnO sensing layer (20–80 nm) has been studied on the sensing response characteristics. Mass loading and elastic loading are identified as the major contributions towards the response of SAW sensor for ammonia and their contributions were evaluated by fitting with the theory.

Experimental results for liquid alkali-group IV alloys

Abstract: Neutron diffraction experiments and measurements of the Knight shift and the electrical resistivity are presented for the liquid systems LiSn, NaPb, NaSn, LiGe, KPb and RbPb. They provide strong evidence for compound formation. There are indications for the existence of anion-clusters in all of these systems, except in LiSn.

Stability of the Tetrahedral Phase in the AI2BIVCVI3 Group of Compounds

Abstract: Three compounds Cu2SnSe3, Cu2SnTe3, and Cu2GeTe3 belonging to the general formula AI2BIVCVI3 are investigated The first compound gives a single phase solid while the other two give a two phase solid with a eutectic type microstructure The first compound is found to tolerate considerable deficiency of the group IV element (Sn) The unit cell size decreases with the decrease in Sn concentration The two phase regions in Cu2GeTe3 and Cu2SnTe3 are analysed using an electron micro-probe It is found that Te distribution is uniform in the two phases but group I and IV elements show complementary distributions, that is, one phase is rich in the Group I element while the other is rich in the Group IV element The observations can be related to the effective valence character of the participating Group IV element Es werden drei Verbindungen, Cu2SnSe3, Cu2SnTe3 und Cu2GeTe3, die zur allgemeinen Gruppe AI2BIVCVI3 gehoren, untersucht Die erste Verbindung ist ein einphasiger Festkorper, wahrend die anderen beiden einen zweiphasigen Festkorper mit einer eutektischen Mikrostruktur bilden Es wird gefunden, das die erste Verbindung einen betrachtlichen Untersch us des Elements der vierten Gruppe (Sn) zulast Die Grose der Einheitszelle nimmt mit der Sn-Konzentration ab Die Zwei-Phasen-Bereiche in Cu2GeTe3 und Cu2SnTe3 werden mit einer Elektronenmikrosonde untersucht; Es wird gefunden, das die Te-Verteilung gleichformig ist in den beiden Phasen; jedoch zeigen die Elemente der I und IV Gruppe komplementare Verteilungen, d h eine Phase hat einen grosen Anteil des Elements der I Gruppe, wahrend die andere einen grosen Anteil des Elements der IV Gruppe hat Die Beobachtungen lassen sich mit dem effektiven Valenzcharakter des beteiligten Elements der IV Gruppe verknupfen