The Halasyamani research group collaborates with scientists throughout the United States and all over the world. We have one of the few research laboratories capable of measuring second-harmonic generation, piezoelectricity, ferroelectricity, and pyroelectricity on bulk and single crystal samples (Chem. Soc. Rev. 35, 710-717, 2006). We are also able to perform refractive index measurements (5 wavelengths) and Maker Fringe measurements on single crystals. Below is a partial list of scientists who have sent samples to Prof. Halasyamani for measurement.

• Prof. Kenneth Poeppelmeier (http://chemgroups.northwestern.edu/poeppelmeier/)
• Prof. Martha Greenblatt (http://chem.rutgers.edu/greenblatt-martha)
• Prof. Hanno zur Loye (http://www.chem.sc.edu/faculty/zurloye/zurloye.htm)
• Prof. Patrick Woodward (https://research.chemistry.ohio-state.edu/woodward/)
• Prof. Shiou-Juh Hwu (http://chemistry.clemson.edu/people/hwu.html)
• Prof. Alexander Norquist (http://www.haverford.edu/chem/Norquist/)
• Prof. Simon Clarke (http://research.chem.ox.ac.uk/simon-clarke.aspx)
• Prof. Michael Hayward (http://research.chem.ox.ac.uk/michael-hayward.aspx)
• Prof. Matthew Rosseinsky (http://www.liv.ac.uk/chemistry/research/rosseinsky-group/)
• Prof. Yoshiyuki Inaguma (http://www-cc.gakushuin.ac.jp/~19990787/yiE.htm)
• Prof. Oliver Mentre (http://uccs.univ-lille1.fr/index.php/annuaire/15-fiches-personnels/167-mentre-olivier)
• Prof. Mats Johnsson (http://www.mmk.su.se/page.php?pid=155&id=237)

Individuals interested in pursuing a collaboration with Prof. Halasyamani regarding these measurements are welcome to e-mail me at psh@uh.edu.

Recent Collaborative Papers

• Trujillo-Hernandez, K., Rodriguez-Lopez, G., Espinosa-Roa, A., Gonzalez-Roque, J., Gomora-Figueroa, A.P., Zhang, W., Halasyamani, P.S., Jancik, V., Gembicky, M., Pirruccio, G., Solis-Ibarra, D., Chirality Control in White-Light Emitting 2D Perovskites, J. Mater. C, 8, 9602-9607, 2020.
• Shankar, R.P.N., Orlandi, F., Manuel, P., Zhang, W., Halasyamani, P.S., Sundaresan, A., A-Site and B-Site Cation Ordering Induces Polar and Multiferroic Behavior in the Perovskite NaLnNiWO6 (Ln = Y, Dy, Ho, and Yb), Chem. Mater., 32, 5641-5649, 2020.
• Parsons, T.G., Hadermann, J., Halasyamani, P.S., Hayward, M.A., Preparation of noncentrosymmetric ferrimagnatic phase La0.9Ba0.1Mn0.96O2.43 by topochemical reduction, J. Solid State Chem., 287, 121356, 2020.
• Wu, H., Zhang, B., Yu, H., Zhanggui, H., Wang, J., Wu, Y., Halasyamani, P.S., Designing Silicates as Deep-UV Nonlinear Optical Materials using Edge-sharing Tetrahedra, Angew. Chemie, 59, 8922-8926, 2020.
• Djani, H., McCabe, E.E., Zhang, W., Halasyamani, P.S., Feteira, A., Bieder, J., Bousquet, E., Ghosez, Ph., Bi2W2O9: a potentially antiferroelectric Aurivillius phase, Phys. Rev. B., 101, 134113, 2020.
• Flynn, S., Sanghvi, S., Nisbet, M., Griffith, K., Zhang, W., Halasyamani, P.S., Haile, S.M., Poeppelmeier, K.R., LiIn2SbO6: A Rutile-Related Structure-type with Ion Transport Pathways, Chem. Mater., 11, 4785-4794, 2020.
• Hancock, J., Nisbet, M., Zhang, W., Halasyamani, P.S., Poeppelmeier, K.R., Periodic Tendril Perversion and Helices in the AMoO2F3 (A = K, Rb, NH4, Tl) Family, J. Am. Chem. Soc., 142, 6375-6380, 2020.
• Zhou, J., Wu, H., Yu, H., Jiang, S., Hu, S., Wang, J., Wu, Y., Halasyamani, P.S., BaF2TeF2(OH)2: A UV Nonlinear Optical Fluorotellurite Material Designed by Band-gap Engineering, J. Am. Chem. Soc., 142, 4616-4620, 2020.
• Xu, J., Wu, H., Zhang, W., Hu, Z., Wu, Y., Yu, H., Halasyamani, P.S., Li2K4TiOGe4O12: A Promising Mid-Infrared Nonlinear Optical Material, Chem. Mater., 32, 906-912, 2020.
• Ding, F., Zhang, W.-L., Nisbet, M., Zhang, W., Halasyamani, P.S., Yang, Z., Pan, S., Poeppelmeier, K.R., NaRb3B6O9(OH)3(HCO3): A Borate-bicarbonate Nonlinear Optical Material, Inorg. Chem., 59, 759-766, 2020.
• Tolman, W., Power, P., Bart, S., Balch, A., Meyer, F., Dehnen, S., Yam, V., Neese, F., Mukherjee, P., Kageyama, H., Sessoli, R., Cossairt, B., Halasyamani, P.S., Morrow, J., Zhou, H.-C., What IS Inorganic Chemistry, Inorg. Chem., 58, 9515-9516, 2019.
• McNulty, J., Tran, T.T., Halasyamani, P.S., McCartan, S., Maclaren, I., Gibbs, A.S., Lim, F.Y.J., Turner, P.W., Gregg, J.M., Lightfoot, P., Morrison, F.D., An Electronically-driven Improper Ferroelectric: Tungsten Bronzes as Microstructure Analogues for the Hexagonal Manganites, Adv. Mater., 1903620, 2019.
• Lin, L., Wu, C., Jiang, X., Lin, Z., Huang, Z., Wei, G., Humphrey, M.G., Halasyamani, P.S., Zhang, C., Additive Polarization of K5(W3O9F4)(IO3) Inducing Optimal Combination for a Mid-Infrared Nonlinear Optical Material, Chem. Mater., 31, *10000-10008, 2019.
• Zhu, T., Khalsa, G., Havas, D., Gibbs, A., Zhang, W., Halasyamani, P.S., Benedek, N., Hayward, M., Cation Exchange as a Mechanism to Engineer Polarity in Layered Perovskites, Chem. Mater., 30, 8915-8924, 2018.
• Liu, H., Zhang, W., Halasyamani, P.S., Stokes, H., Campbell, B., Evans, J., and Evans, I., Understanding the behavior of the room-temperature molecular ferroelectric 5,6-dichloro-2-methylbenzimidazole using symmetry adapted distortion mode analysis, J. Am. Chem. Soc., 41, 13441-13448, 2018.
• Ding, F., Nisbet, M.L., Zhang, W., Halasyamani, P.S., and Poeppelmeier, K.R., Why Some Non-centrosymmetric Borates Do Not Make Good Nonlinear Optical Materials - A Case Study with K3B5O8(OH)2, Inorg. Chem., 57, 11801-11808, 2018.
• Tsujimoto, Y., Juillerat, C.A., Zhang, W., Fujii, K., Yashima, M., Halasyamani, P.S., zur Loye, H.-C., Function of Tetrahedral ZnS3O Building Blocks in the Formation of SrZn2OS2: A Phase Matchable Polar Oxysulfide with Twice the SHG Intensity of Potassium Dihydrogen Phosphate (KDP), Chem. Mater., 30, 6486-6493, 2018.
• Shanbhag, P.N., Nagesha, C., Rao, R., Tran, T.T., Halasyamani, P.S., and Athinarayanan, S., High Pressure Synthesis and Magnetic Properties of Corundum-type Ga1-xAlxFeO3 (x = 0, 0.25, 0.5), J. Solid State Chem., 265, 79-84, 2018.
• Ding, F., Nisbet, M., Yu, H., Zhang, W., Chai, L., Halasyamani, P.S., and Poeppelmeier, K.R., Synthesis, Structures and Properties of Noncentrosymmetric Quaternary Tellurates BiMTeO6 (M = Al, Ga), Inorg. Chem., 57, 7950-7956, 2018.
• Halasyamani, P.S. and Rondinelli, J.M., The must-have and nice-to-have requirements of technologically functional frequency doubling deep-UV crystals, Nat. Commun., DOI: 10.1038/s41467-018-05411-1, 2018.
• Tolman, W. and Halasyamani, P.S., The Five Stages of Rejection, Inorg. Chem., 57, 4789-4790, 2018.
• Zhu, T., Cohen, T., Gibbs, A., Zhang W., Halasyamani, P.S., Hayward, M., and Benedek, N., Theory and Neutrons Combine to Reveal A Family of Layered Perovskites Without Inversion Symmetry, Chem. Mater., 29, 9489-9497, 2017.
• Zhang, R., Gibbs, A. S., Zhang, W., Halasyamani, P.S., and Hayward, M.A., Structural modification of the cation-ordered Ruddlesden-Popper phase YSr₂Mn₂O₇ by cation exchange and anion insertion, Inorg. Chem., 56, 9988-9995, 2017.
• Wu, H., Yu, H., Pan, S., and Halasyamani, P.S., A Deep-Ultraviolet NLO Material K₃Sr₃Li₂Al₄B₆O₂₀F: Addressing the Structural Instability Problem in KBe₂BO₃F₂, Inorg. Chem., 56, 8755, 2017.
• Wu, H., Yu, H., Zhang, W., Cantwell, J., Poeppelmeier, K.R., Pan, S., and Halasyamani, P.S., Crystal Growth, Linear and Nonlinear Optical Properties of KIO₃ . Te(OH)₆, Cryst. Growth Des., 17, 4405, 2017.
• Ghara, S., Suard, E., Francois, F., Tran, T.T., Halasyamani, P.S., Iyo, A., Rodriguez-Carvajal, J., and Sundaresan, A., Ordered aeschynite-type polar magnets RFeWO6 (R = Dy, Eu, Tb, and Y): A new family of type-II multiferroics, Phys. Rev. B., 95, 224416, 2017.
• Yu, H., Young, J., Wu, H., Zhang, W., Rondinelli, J.M., and Halasyamani, P.S., M₄Mg₄(P₂O₇)₃ (M = K, Rb): Structural Engineering of Pyrophosphates for NLO Applications, Chem. Mater., 29, 1845-1855, 2017.
• Wu, H., Yu, H., Zhang, W., Cantwell, J., Poeppelmeier, K.R., Pan, S., and Halasyamani, P.S., Top-Seeded Solution Crystal Growth, Linear and Nonlinear Optical Properties of Ba₄B₁₁O₂₀F (BBOF), Cryst. Growth Des., 17, 1404-1410, 2017.
• Tran, T.T., Koocher, N.Z., Rondinelli, J.M., and Halasyamani, P.S., Be-free β-Rb₂Al₂B₂O₇ (β-RABO) as a Possible Deep-Ultraviolet Nonlinear Optical Material Replacement for KBe₂BO₃F₂ (KBBF), Angew. Chemie, 56, 2969-2973, 2017.
• Olchowka, J., Colmont, M., Aliev, A., Tran, T.T., Halasyamani, P.S., Hagemann, H.R., and Mentré, O., New oxo-centered bismuth oxo-arsenates; Critical effect of PO₄ for AsO₄ substitution, CrystEngComm, 19, 936-945, 2017.
• Tran, T.T., Young, J., Rondinelli, J.M., and Halasyamani, P.S., Mixed-Metal Carbonate Fluorides as Deep-Ultraviolet Non-linear Optical Materials, J. Am. Chem. Soc., 139, 1285-1295, 2017.
• Khatri, N., Pablico-Lansigan, M., Boncher, W., Mertzman, J., Labatete, A., Grande, L., Wunder, D., Prushan, M., Zhang, W., Halasyamani, P.S., de-Bettencourt-Dias, A., and Stoll, S., Luminescence and NonLinear Optical Properties in Copper (I) Halide Extended Networks, Inorg. Chem., 55, 11408-11417, 2016.
• Cochrane, A.K., Telfer, M., Dixon, C. A. L., Zhang, W., Halasyamani, P.S., Bousquet, E., and Lightfoot, P., NdBaScO₄: aristotype of a new family of geometric ferroelectrics, Chem. Commun., 52, 10980-10983, 2016.
• Zhang, R., Abbet, B.M., Read, G., Lang, F., Lancaster, T., Tran, T.T., Halasyamani, P.S., Blundell, S.J., Benedek, N.A., and Hayward, M.A., La₂SrCr₂O₇: Controlling the tilting distortions of n = 2 Ruddlesden-Popper phases through A-site cation order, Inorg. Chem., 55, 8951-8960, 2016.
• Tran, T.T., Yu, H., Rondinelli, J.R., Poeppelmeier, K.R., and Halasyamani, P.S., Deep Ultraviolet Nonlinear Optical Materials, Chem. Mater., 28, 5238-5258, 2016.
• Zhang, W., Yu, H., Cantwell, J., Wu, H., Poeppelmeier, K.R., and Halasyamani, P.S., LiNa₅Mo₉O₃₀: Crystal Growth, Linear and Non-linear Optical Properties, Chem. Mater., 28, 4483-4491, 2016.
• Yu, H., Cantwell, J., Wu, H., Zhang, W., Poeppelmeier, K.R., and Halasyamani, P.S., Top-Seeded Solution Crystal Growth, Morphology, Optical and Thermal Properties of Ba₃(ZnB₅O₁₀)PO₄ (BZBP), Cryst. Growth Des., 16, 3976-3982, 2016.
• Yu, H., Young, J., Wu, H., Zhang, W., Rondinelli, J.M., and Halasyamani, P.S., Electronic, Crystal Chemistry, and Nonlinear Optical Property Relationships in the Dugganite A₃B₃CD₂O₁₄ Family (A = Sr, Ba or Pb; B = Mg or Zn; C = Te or W, and D = P or V), J. Am. Chem. Soc., 138, 4984-4989, 2016.
• Zhang, R., Abbet, B.M., Read, G., Lang, F., Lancaster, T., Tran, T.T., Halasyamani, P.S., Blundell, S.J., Benedek, N.A., and Hayward, M.A., La₂SrCr₂O₇: Controlling the tilting distortions of n = 2 Ruddlesden-Popper phases through A-site cation order, Inorg. Chem., In Press, 2016.
• Kim, H.G., Tran, T.T., Choi, W., You, T.-S., Halasyamani, P.S., and Ok, K.M., Two New Noncentrosymmetric (NCS) n = 3 Layered Dion-Jacobson (DJ) Perovskites: Polar RbBi₂Ti₂NbO₁₀ and Nonpolar CsBi₂Ti₂TaO₁₀, Chem. Mater., 28, 2424-2432, 2016.
• Morrison, G., Tran, T. T., Halasyamani, P.S., and zur Loye, H.-C., K₈(K₅F)U₆Si₈O₄₀: The First Intergrowth Uranyl Silicate, Inorg. Chem., 55, 3215-3217, 2016.
• Yaghoobnejad A. H., Morris, R., Tran, T. T., Halasyamani, P.S., Ghosh, K., and Choudhury, A., A Cubic Non-centrosymmetric Mixed-valence Iron Borophosphate-Phosphite, Cryst. Growth Des., 16, 1187-1194, 2016.
• McCabe, E.E., Bousquet, E., Stockdale, C.P.J., Deacon, C.A., Tran, T.T., Halasyamani, P.S., Stennett, M.C., Hyatt, N.C., Synthesis, structure and properties of CsBi₂Ti₂NbO₁₀: A new layered perovskite proper ferroelectric, Chem. Mater., 27, 8298-8309, 2015.
• Gerke, B., Tran, T. T., Pottgen, R., and Halasyamani, P.S., ¹¹⁹Sn Mossbauer Spectroscopy of Solveothermally Synthesized Fluorides ASnF₃ (A = Na, K, Rb, Cs), Z. Naturforsch., 70, 765-767, 2015.
• Morrison, G., Smith, M.D., Tran, T.T., Halasyamani, P.S., and zur Loye, H.-C., Synthesis and Structure of a New Pentanary Uranium (VI) Silicate: K₄CaUSi₄O₁₄, CrystEngComm., 17, 4218-4224, 2015.
• Latshaw, A.M., Wilkins, B.O., Hughey, K.D., Yeon, J., Williams, D.E., Tran, T.T., Halasyamani, P.S., and zur Loye, H.-C., A₅RE₄X[TO₄]₄ Crystal Growth and Photoluminescene. Part 2. Fluoride Flux Synthesis of Sodium and Potassium Rare Earth Silicate Oxyfluorides, CrystEngComm, 17, 4654-4661, 2015.
• Cortese, A., Wilkins, B., Smith, M., Yeon, J., Morrison, G., Tran, T.T., Halasyamani, P.S., and zur Loye, H.-C., Crystal Growth of Four Oxovanadium(IV) Tartrates Prepared via a Mild Two Step Hydrothermal Method: Observation of Spin Dimer Behavior and Second Harmonic Generation, Inorg. Chem., 54, 4011-4020, 2015.
• Kim, Y.H, Tran, T.T., Halasyamani, P.S., and Ok, K.M., Macroscopic polarity control with alkali metal cation size and coordination environment in a series of tin iodates, Inorg. Chem. Frontiers, 2, 361-368, 2015.
• Mandal, P., Manjob-Sanz, A., Corkett, A.J., Comyn, T.P., Dawson, K., Stevenson, T., Bennett, J., Henrichs, L.F., Bell, A.J., Nishibori, E., Takata, M., Zanella, M., Dolgos, M.R., Adem, U., Wan, X., Pitcher, M.J., Romani, S., Tran, T.T., Halasyamani, P.S., Claridge, J.B., and Rosseinsky, M.J., Morphotropic Phase Boundary in the Pb-Free (1-x)BiTi_3/8Fe_2/8Mg_3/8O₃ - xCaTiO₃ System: Tetragonal Polarization and Enhanced Electromechanical Properties, Adv. Mater., 27, 2883-2889, 2015.
• Donakowski, M.D., Gautier, R., Lu, H., Tran, T.T., Cantwell, J., Halasyamani, P.S., and Poeppelmeier, K.R., Synthesis of Two Vanadium Oxide-Fluoride Materials that Differ in Phase Matchability, Inorg. Chem., 54, 765-772, 2015.
• Patino, M.A., Smith, M., Zhang, W., Halasyamani, P.S., and Hayward, M.A., Cation Exchange in a 3D Perovskite - Synthesis of Ni_0.5TaO₃, Inorg. Chem., 53, 8020-8024, 2014.
• Greenblatt, M., Retuerto, M., Li, M., Ignatov, A., Croft, M., Hodges, J., Tran, T.T, and Halasyamani, P.S., Crystallographic and magnetic properties of Pb_2-xBi_xIr₂O_7-d, Mat. Res. Express, 1, 046304/1 - 046304/12, 2014.
• Aliev, A., Endara, D., Huve, M., Colmont, M., Roussel, P., Tran, T. T., Halasyamani, P.S., and Mentre, O., Labile degree of disorder in Bismuth-oxyphosphates compounds: illustration through three new structural types, Inorg. Chem., 53, 861-871, 2014.
• Holland, M, Donakowski, M.D., Pozzi, E.A., Rasmussen, A.M., Tran, T.T., Pease-Dodson, S.E., Halasyamani, P.S., Seideman, T., Van Duyne, R.P., Poeppelmeier, K.R., Polar Alignment of Lambda-Shaped Basic Building Units within Transition Metal Oxide Fluoride Materials, Inorg. Chem., 53, 221-228, 2014.
• Luo, K., Tran, T.T., Halasyamani, P.S., and Hayward, M.A., Synthesis and Selective Topochemical Fluorination of the cation and anion-vacancy ordered phases Ba₂YCoO₅ and Ba₃YCo₂O_7.5, Inorg. Chem., 52, 13762-13769, 2013.
• Retuerto, M., Li, M.R., Go, Y.B., Ignatov, A., Croft, M., Ramanujachary, K.V., Herber, R.H., Nowik, I., Hodges, J.P., Dachraui, W., Hadermann, J., Van Tendeloo, G., Tran, T.T., Halasyamani, P.S., Greenblatt, M., Polar and magnetic layered A-Site and rock salt B-Site Ordering NaLnFeWO₆ (Ln = La, Nd) perovskites, Inorg. Chem, 52, 12482-12491, 2013.
• Reger, D.L., Leitner, A., Smith, M.D., Tran, T.T., and Halasyamani, P.S., Homochiral Helical Metal-Organic Frameworks of Group 1 Metals using Enantiopure Ligands Containing a 1,8-Naphthalimide Group, Inorg. Chem., 52, 10041-10051, 2013.
• Lu, Hongcheng; Gautier, Romain; Donakowski, Martin; Tran, T. Thao; Edwards, Bryce; Nino, Juan; Halasyamani, P. Shiv; Liu, Zhengtang; Poeppelmeier, Kenneth, Non-Linear Active Materials: An Illustration of Controllable Phase Matchability, J. Am. Chem. Soc., 135, 11942-11950, 2013.
• Li, M.-R, Walker, D., Retuerto, M., Sarkar, T., Hadermann, J. Stephens, P.W., Croft, M., Ignatov, A., Hemberger, J., Nowik, I., Halasyamani, P.S., Tran, T.T., Mukherjee, S., Dasgupta, T.S., Greenblatt, M., Polar Mn₂FeMO₆ (M = Nb, Ta) with LiNbO₃-type Structure - High Pressure Synthesis, Angew. Chemie, 52, 8406-8410, 2013.
• Yeon, J., Sefat, A.A., Tran, T.T., Halasyamani, P.S., zur Loye, H.-C., Crystal Growth, Structure, Polarization and Magnetic Properties of Cesium Vanadate, Cs₂V₃O₈: A Structure-Property Study, Inorg. Chem., 52, 6179-6186, 2013.
• Luo, K., Johnson, R.D., Tran, T.T., Halasyamani, P.S., Radaelli, P.G., and Hayward, M.A., Ba₂YFeO_5.5 - A Ferromagnetic Pyroelectric Phase Prepared by Topochemical Oxidation, Chem. Mater., 25, 1800-1808, 2013.