A SHORT ANNOTATION AND MAIN PUBLICATIONS.


GENERAL SCHEME OF INVESTIGATIONS





SHORT ANNOTATION

In the results of searching for new perspective solid state materials for the quantum electronics, non-linear optics and other fields of physics more than 200 various oxide compounds were synthesized and peculiarities of their atomic structure and physical properties are studied. Single crystals of 80 such the compounds are grown and thoroughly investigated.

Four new large family of ferroelectrics are found and the existence of crystalline materials of a new specific type: ferroelectrics - superionics in which phenomena of electrical ordering are combine with anomalous high ionic conductivity is established.

In particular the structure and properties of rare-earth tungstates and molybdates Ln2W(Mo)O6 are investigated and their polymorphism as well as polytypism of the La2WO6 crystals are discovered. Perfect single crystals of Bi2WO6 and other related bismuth-bearing ferroelectric compounds with the ordinary and mixed layered perovskitelike structures are obtained and the symmetry of such the crystals with various layer thickness and sequence was analyzed.

Ferroelectric properties were observed also for a number of new compounds ABnW3-nO9 with the structure of hexagonal tungsten bronze and ABnW2-nO6 of the "defect" pyrochlore type.

Special attention was paid to the crystals of KTiOPO4 family and their solid solutions which are now widely used in non-linear optics and attract much attention. As it was shown for the first time in the Crystal Growth Laboratory these crystals undergo second order ferroelectric phase transitions, show high piezoelectric activity and superionic conductivity. They are the most typical examples of the ferroelectrics - superionics.

In the course of studies on the high-temperature superconductors the single crystals of several families of such the compounds are grown and studied. In particular the highly perfect, domain-free single crystals of the YBa2Cu3O7-x - family were obtained. Influence of domain walls on the superconducting transitions is studied. A large review on the atomic structures and physical properties of the HTSC of various types was published.



    Main publications:

    Summary and review papers:
  1. Growth of single crystals of high-temperature oxides. V.K.Yanovskii. Zh. Vses. Khim. O-va im D.I.Mendeleeva, 1968, v.13, p.134 (in Russian).
  2. Flux growth and characteristics of some ferroelectric and related crystals. V.K.Yanovskii and V.I.Voronkova. J.Crystal Growth. 1981. v.52, pt.2, pp.654-659.
  3. Crystal Chemistry of HTSC. V.K.Yanovskii, V.I.Voronkova, and I.V.Vodolazskaya. In book "Physical Properties of HTSC". Hyperoks, Moscow. 1991, v.2, pp.5-224.
  4. Flux growth and properties of oxide crystals. V.I.Voronkova, V.K.Yanovskii, I.V.Vodolazskaya, and E.S.Shubentsova. Growth of Crystals, v.19, Consultants Bureau, N.Y., 1993, pp. 111- 165.
  5. Growth, detwinning, and properties of YBa2Cu3Ox and TmBa2Cu3Ox single crystals. V.I.Voronkova and V.K.Yanovskii. Growth of Crystals, v.20, Consultants Bureau, N.Y., 1996, pp. 153 - 169.
  6. Growth and properties of Nb- or Sn-doped KTiOPO4 crystals. V.K.Yanovskii, V.I.Voronkova, T.Yu.Losevskaya, S.Yu.Stefanovich, S.A.Ivanov, V.I.Simonov, N.I.Sorokina.Crystallography Report, 2002, v.47, Suppl.1, pp.S99-S104.

    Original papers:
  1. V.K.Yanovskii, V.I.Voronkova. Ferroelectric phase transitions and properties of the crystals of KTiOPO4 - family. Phys.stat.sol.(a) , 1986, V.93, 665.
  2. V.K.Yanovskii, V.I.Voronkova. Ferroelectrics - superionics. XIV International congress of crystallography. Perth, 1987. Collected abstracts, OS-2-8.
  3. V.I.Voronkova, V.K.Yanovskii, V.N.Molchanov, N.I.Sorokina, V.I.Simonov. Synthesis f single domain superconductor TmBa2Cu3O7-x and its atomic structure. JETP Letters, 1990, V.52, 224.
  4. V.I.Voronkova and V.K.Yanovskii. Ferroelastic domains in RBa2Cu3O7-x crystals. Ferroelectrics, 1997, V.191, 275.
  5. T.Yu.Losevskaya, E.P.Haritonova, V.I.Voronkova, V.K.Yanovskii, S.Yu.Stefanovich, N.I.Sorokina, V.I.Simonov. Superionic transitions in the K1- xTi1-xNbxOPO4 and K3Nb3B2O12 crystals. Crystallography Reports. 1999, V.44, 90.
  6. E.P.Haritonova, V.I.Voronkova, V.K.Yanovskii, S.Yu.Stefanovich, A.V.Mosunov. Phase transitions and domain structure of ferroelectric - ferroelastic - superionic crystals K3Nb3B2O12 and their solid solutions. Ferroelectrics, 1999, V.221, 73.
  7. Growth, structure and properties of ferroelectric- ferroelastic-superionic K3Nb3B2O12 and K3-xNaxNb3B2O12 crystals. V.I.Voronkova, E.P. Kharitonova, V.K.Yanovskii, S.Yu.Stefanovich, A.V.Mosunov, N.I. Sorokina.Crystallography Reports. 2000, V.45, 816.
  8. Growth, morphology and thermal properties of Nd1+xBa2-xCu3Oy single crystals. Th.Wolf, V. Voronkova, P. Schweiss. Physica C , 2000, V.341-348, 515.
  9. Growth and properties of KTi1-xSnxOPO4. Liu Wen, V.I. Voronkova, V.K. Yanovskii, S.Yu.Stefanovich,N.I. Sorokina, I.A. Verin. Inorganic materials .2001, V. 37, 290.
  10. Crystal growth and physical properties of Cs2Nb4O11 and Rb2Nb4O11 single crystals. E.P.Kharitonova, V.I.Voronkova, V.K.Yanovskii, S.Yu.Stefanovich. J. Crystal Growth , 2002, v.237-239, pp.703-706.
  11. Growth and physical properties of K1-xTi1-xSbxOPO4 crystals. T.Yu.Losevskaya, V.K.Yanovskii, V.I.Voronkova, and S.Yu.Stefanovich. Inorganic Materials, 2002, v.38, No.8, pp.1164-1167.
  12. Growth, structure and properties of ferroelectric- ferroelastic-superionic K3Nb3B2O12 and K3-xNaxNb3B2O12 crystals. V.I.Voronkova, E.P. Kharitonova, V.K.Yanovskii, S.Yu.Stefanovich, A.V.Mosunov, N.I. Sorokina.Crystallography Reports. 2000, V.45, 816.
  13. Crystal growth and physical properties of Cs2Nb4O11 and Rb2Nb4O11 single crystals. E.P.Kharitonova, V.I.Voronkova, V.K.Yanovskii, S.Yu.Stefanovich. J. Crystal Growth , 2002, v.237-239, pp.703-706.
  14. Polymorphism of ferroelectric, ferroelastic, superionic crystals K3Nb3B2O12 and K3-xNaxNb3B2O12. E.P.Kharitonova, V.I.Voronkova, V.K.Yanovskii, and S.Yu.Stefanovich. Inorganic Materials , 2002, v.38, No.8, pp.819-824.


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